{"meta":{"title":"KEV entries: Synacor","description":"All KEV entries for vendor Synacor.","source":"CISA Known Exploited Vulnerabilities catalog (https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json)","catalogVersion":"2026.09.23","catalogDateReleased":"2026-09-23T12:51:35.821Z","referenceDate":"2026-09-23","publisher":"Telemetry","license":"https://creativecommons.org/licenses/by/4.0/","documentation":"https://glide-telemetry.pages.dev/api/","records":19,"vendor":"Synacor","entries":19,"shareOfCatalogPercent":1.1,"ransomwareKnown":6,"firstDateAdded":"2022-01-10","latestDateAdded":"2026-08-21","rank":15},"data":[{"cveID":"CVE-2026-73570","vendorProject":"Synacor","product":"Zimbra Collaboration Suite (ZCS)","vulnerabilityName":"Zimbra Collaboration Suite (ZCS) OS Command Injection Vulnerability","dateAdded":"2026-08-21","dueDate":"2026-08-24","knownRansomwareCampaignUse":"Unknown","cwes":["CWE-78"],"shortDescription":"Zimbra Collaboration Suite (ZCS) contains an OS command injection vulnerability which could allow an unauthenticated attacker to send specially crafted SMTP requests that may result in execution of arbitrary operating system commands as the Zimbra user.","requiredAction":"Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.","notes":"https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories ; https://blog.zimbra.com/2026/07/patch-release-update-zimbra-10-1-20/ ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-73570","telemetryUrl":"https://glide-telemetry.pages.dev/kev/cve-2026-73570/"},{"cveID":"CVE-2025-48700","vendorProject":"Synacor","product":"Zimbra Collaboration Suite (ZCS)","vulnerabilityName":"Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerability","dateAdded":"2026-04-20","dueDate":"2026-04-23","knownRansomwareCampaignUse":"Unknown","cwes":["CWE-79"],"shortDescription":"Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability that could allow attackers to execute arbitrary JavaScript within the user's session, potentially leading to unauthorized access to sensitive information.","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","notes":"https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories ; https://nvd.nist.gov/vuln/detail/CVE-2025-48700","telemetryUrl":"https://glide-telemetry.pages.dev/kev/2026/#cve-2025-48700"},{"cveID":"CVE-2025-66376","vendorProject":"Synacor","product":"Zimbra Collaboration Suite (ZCS)","vulnerabilityName":"Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting Vulnerability","dateAdded":"2026-03-18","dueDate":"2026-04-01","knownRansomwareCampaignUse":"Unknown","cwes":["CWE-79"],"shortDescription":"Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability in the Classic UI where attackers could abuse Cascading Style Sheets (CSS) @import directives in email HTML.","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","notes":"https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories ; https://nvd.nist.gov/vuln/detail/CVE-2025-66376","telemetryUrl":"https://glide-telemetry.pages.dev/kev/2026/#cve-2025-66376"},{"cveID":"CVE-2020-7796","vendorProject":"Synacor","product":"Zimbra Collaboration Suite","vulnerabilityName":"Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery Vulnerability","dateAdded":"2026-02-17","dueDate":"2026-03-10","knownRansomwareCampaignUse":"Unknown","cwes":["CWE-918"],"shortDescription":"Synacor Zimbra Collaboration Suite (ZCS) contains a server-side request forgery vulnerability if WebEx zimlet installed and zimlet JSP is enabled.","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","notes":"https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P7 ; https://nvd.nist.gov/vuln/detail/CVE-2020-7796","telemetryUrl":"https://glide-telemetry.pages.dev/kev/2026/#cve-2020-7796"},{"cveID":"CVE-2025-68645","vendorProject":"Synacor","product":" Zimbra Collaboration Suite (ZCS)","vulnerabilityName":"Synacor Zimbra Collaboration Suite (ZCS) PHP Remote File Inclusion Vulnerability","dateAdded":"2026-01-22","dueDate":"2026-02-12","knownRansomwareCampaignUse":"Unknown","cwes":["CWE-98"],"shortDescription":"Synacor Zimbra Collaboration Suite (ZCS) contains a PHP remote file inclusion vulnerability that could allow for remote attackers to craft requests to the /h/rest endpoint to influence internal request dispatching, allowing inclusion of arbitrary files from the WebRoot directory.","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","notes":"https://wiki.zimbra.com/wiki/Security_Center ; https://nvd.nist.gov/vuln/detail/CVE-2025-68645","telemetryUrl":"https://glide-telemetry.pages.dev/kev/2026/#cve-2025-68645"},{"cveID":"CVE-2025-27915","vendorProject":"Synacor","product":"Zimbra Collaboration Suite (ZCS)","vulnerabilityName":"Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerability","dateAdded":"2025-10-07","dueDate":"2025-10-28","knownRansomwareCampaignUse":"Unknown","cwes":["CWE-79"],"shortDescription":"Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability that exists in the Classic Web Client due to insufficient sanitization of HTML content in ICS files. When a user views an e-mail message containing a malicious ICS entry, its embedded JavaScript executes via an ontoggle event inside a tag. This allows an attacker to run arbitrary JavaScript within the victim's session, potentially leading to unauthorized actions such as setting e-mail filters to redirect messages to an attacker-controlled address. As a result, an attacker can perform unauthorized actions on the victim's account, including e-mail redirection and data exfiltration.","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","notes":"https://wiki.zimbra.com/wiki/Security_Center ; https://nvd.nist.gov/vuln/detail/CVE-2025-27915","telemetryUrl":"https://glide-telemetry.pages.dev/kev/2025/#cve-2025-27915"},{"cveID":"CVE-2019-9621","vendorProject":"Synacor","product":"Zimbra Collaboration Suite (ZCS)","vulnerabilityName":"Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery (SSRF) Vulnerability","dateAdded":"2025-07-07","dueDate":"2025-07-28","knownRansomwareCampaignUse":"Unknown","cwes":["CWE-918","CWE-807"],"shortDescription":"Synacor Zimbra Collaboration Suite (ZCS) contains a server-side request forgery (SSRF) vulnerability via the ProxyServlet component.","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","notes":"https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories ; https://wiki.zimbra.com/wiki/Security_Center ; https://nvd.nist.gov/vuln/detail/CVE-2019-9621","telemetryUrl":"https://glide-telemetry.pages.dev/kev/2025/#cve-2019-9621"},{"cveID":"CVE-2024-27443","vendorProject":"Synacor","product":"Zimbra Collaboration Suite (ZCS)","vulnerabilityName":"Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability","dateAdded":"2025-05-19","dueDate":"2025-06-09","knownRansomwareCampaignUse":"Unknown","cwes":["CWE-79"],"shortDescription":"Zimbra Collaboration contains a cross-site scripting (XSS) vulnerability in the CalendarInvite feature of the Zimbra webmail classic user interface. An attacker can exploit this vulnerability via an email message containing a crafted calendar header, leading to the execution of arbitrary JavaScript code.","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","notes":"https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P46#Security_Fixes ; https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P39#Security_Fixes ; https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.7#Security_Fixes ; https://nvd.nist.gov/vuln/detail/CVE-2024-27443","telemetryUrl":"https://glide-telemetry.pages.dev/kev/2025/#cve-2024-27443"},{"cveID":"CVE-2023-34192","vendorProject":"Synacor","product":"Zimbra Collaboration Suite (ZCS)","vulnerabilityName":"Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability","dateAdded":"2025-02-25","dueDate":"2025-03-18","knownRansomwareCampaignUse":"Unknown","cwes":["CWE-79"],"shortDescription":"Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting (XSS) vulnerability that allows a remote authenticated attacker to execute arbitrary code via a crafted script to the /h/autoSaveDraft function.","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","notes":"https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories ; https://nvd.nist.gov/vuln/detail/CVE-2023-34192","telemetryUrl":"https://glide-telemetry.pages.dev/kev/2025/#cve-2023-34192"},{"cveID":"CVE-2024-45519","vendorProject":"Synacor","product":"Zimbra Collaboration Suite (ZCS)","vulnerabilityName":"Synacor Zimbra Collaboration Suite (ZCS) Command Execution Vulnerability","dateAdded":"2024-10-03","dueDate":"2024-10-24","knownRansomwareCampaignUse":"Unknown","cwes":["CWE-284"],"shortDescription":"Synacor Zimbra Collaboration Suite (ZCS) contains an unspecified vulnerability in the postjournal service that may allow an unauthenticated user to execute commands.","requiredAction":"Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.","notes":"https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories ; https://nvd.nist.gov/vuln/detail/CVE-2024-45519","telemetryUrl":"https://glide-telemetry.pages.dev/kev/2024/#cve-2024-45519"},{"cveID":"CVE-2023-37580","vendorProject":"Synacor","product":"Zimbra Collaboration Suite (ZCS)","vulnerabilityName":"Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability","dateAdded":"2023-07-27","dueDate":"2023-08-17","knownRansomwareCampaignUse":"Unknown","cwes":["CWE-79"],"shortDescription":"Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability impacting the confidentiality and integrity of data.","requiredAction":"Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.","notes":"https://wiki.zimbra.com/wiki/Security_Center ;  https://nvd.nist.gov/vuln/detail/CVE-2023-37580","telemetryUrl":"https://glide-telemetry.pages.dev/kev/2023/#cve-2023-37580"},{"cveID":"CVE-2022-27926","vendorProject":"Synacor","product":"Zimbra Collaboration Suite (ZCS)","vulnerabilityName":"Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability","dateAdded":"2023-04-03","dueDate":"2023-04-24","knownRansomwareCampaignUse":"Unknown","cwes":["CWE-79","CWE-138"],"shortDescription":"Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability by allowing an endpoint URL to accept parameters without sanitizing.","requiredAction":"Apply updates per vendor instructions.","notes":"https://wiki.zimbra.com/wiki/Security_Center;  https://nvd.nist.gov/vuln/detail/CVE-2022-27926","telemetryUrl":"https://glide-telemetry.pages.dev/kev/2023/#cve-2022-27926"},{"cveID":"CVE-2022-41352","vendorProject":"Synacor","product":"Zimbra Collaboration Suite (ZCS)","vulnerabilityName":"Synacor Zimbra Collaboration Suite (ZCS) Arbitrary File Upload Vulnerability","dateAdded":"2022-10-20","dueDate":"2022-11-10","knownRansomwareCampaignUse":"Known","cwes":["CWE-22"],"shortDescription":"Synacor Zimbra Collaboration Suite (ZCS) allows an attacker to upload arbitrary files using cpio package to gain incorrect access to any other user accounts.","requiredAction":"Apply updates per vendor instructions.","notes":"https://wiki.zimbra.com/wiki/Security_Center;  https://nvd.nist.gov/vuln/detail/CVE-2022-41352","telemetryUrl":"https://glide-telemetry.pages.dev/kev/2022/#cve-2022-41352"},{"cveID":"CVE-2022-37042","vendorProject":"Synacor","product":"Zimbra Collaboration Suite (ZCS)","vulnerabilityName":"Synacor Zimbra Collaboration Suite (ZCS) Authentication Bypass Vulnerability","dateAdded":"2022-08-11","dueDate":"2022-09-01","knownRansomwareCampaignUse":"Known","cwes":["CWE-23"],"shortDescription":"Synacor Zimbra Collaboration Suite (ZCS) contains an authentication bypass vulnerability in MailboxImportServlet. This vulnerability was chained with CVE-2022-27925 which allows for unauthenticated remote code execution.","requiredAction":"Apply updates per vendor instructions.","notes":"https://blog.zimbra.com/2022/08/authentication-bypass-in-mailboximportservlet-vulnerability/;  https://nvd.nist.gov/vuln/detail/CVE-2022-37042","telemetryUrl":"https://glide-telemetry.pages.dev/kev/2022/#cve-2022-37042"},{"cveID":"CVE-2022-27925","vendorProject":"Synacor","product":"Zimbra Collaboration Suite (ZCS)","vulnerabilityName":"Synacor Zimbra Collaboration Suite (ZCS) Arbitrary File Upload Vulnerability","dateAdded":"2022-08-11","dueDate":"2022-09-01","knownRansomwareCampaignUse":"Known","cwes":["CWE-22"],"shortDescription":"Synacor Zimbra Collaboration Suite (ZCS) contains flaw in the mboximport functionality, allowing an authenticated attacker to upload arbitrary files to perform remote code execution. This vulnerability was chained with CVE-2022-37042 which allows for unauthenticated remote code execution.","requiredAction":"Apply updates per vendor instructions.","notes":"https://blog.zimbra.com/2022/08/authentication-bypass-in-mailboximportservlet-vulnerability/;  https://nvd.nist.gov/vuln/detail/CVE-2022-27925","telemetryUrl":"https://glide-telemetry.pages.dev/kev/2022/#cve-2022-27925"},{"cveID":"CVE-2022-27924","vendorProject":"Synacor","product":"Zimbra Collaboration Suite (ZCS)","vulnerabilityName":"Synacor Zimbra Collaboration Suite (ZCS) Command Injection Vulnerability","dateAdded":"2022-08-04","dueDate":"2022-08-25","knownRansomwareCampaignUse":"Known","cwes":["CWE-93"],"shortDescription":"Synacor Zimbra Collaboration Suite (ZCS) allows an attacker to inject memcache commands into a targeted instance which causes an overwrite of arbitrary cached entries.","requiredAction":"Apply updates per vendor instructions.","notes":"https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P24.1#Security_Fixes;  https://nvd.nist.gov/vuln/detail/CVE-2022-27924","telemetryUrl":"https://glide-telemetry.pages.dev/kev/2022/#cve-2022-27924"},{"cveID":"CVE-2018-6882","vendorProject":"Synacor","product":"Zimbra Collaboration Suite (ZCS)","vulnerabilityName":"Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability","dateAdded":"2022-04-19","dueDate":"2022-05-10","knownRansomwareCampaignUse":"Known","cwes":["CWE-79"],"shortDescription":"Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability that might allow remote attackers to inject arbitrary web script or HTML.","requiredAction":"Apply updates per vendor instructions.","notes":"https://nvd.nist.gov/vuln/detail/CVE-2018-6882","telemetryUrl":"https://glide-telemetry.pages.dev/kev/2022/#cve-2018-6882"},{"cveID":"CVE-2022-24682","vendorProject":"Synacor","product":"Zimbra Collaborate Suite (ZCS)","vulnerabilityName":"Synacor Zimbra Collaborate Suite (ZCS) Cross-Site Scripting Vulnerability","dateAdded":"2022-02-25","dueDate":"2022-03-11","knownRansomwareCampaignUse":"Known","cwes":["CWE-79","CWE-116"],"shortDescription":"Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting (XSS) vulnerability in the Calendar feature that allows an attacker to execute arbitrary code.","requiredAction":"Apply updates per vendor instructions.","notes":"https://nvd.nist.gov/vuln/detail/CVE-2022-24682","telemetryUrl":"https://glide-telemetry.pages.dev/kev/2022/#cve-2022-24682"},{"cveID":"CVE-2019-9670","vendorProject":"Synacor","product":"Zimbra Collaboration Suite (ZCS)","vulnerabilityName":"Synacor Zimbra Collaboration Suite (ZCS) Improper Restriction of XML External Entity Reference","dateAdded":"2022-01-10","dueDate":"2022-07-10","knownRansomwareCampaignUse":"Unknown","cwes":["CWE-611"],"shortDescription":"Synacor Zimbra Collaboration Suite (ZCS) contains an improper restriction of XML external entity (XXE) vulnerability in the mailboxd component.","requiredAction":"Apply updates per vendor instructions.","notes":"https://nvd.nist.gov/vuln/detail/CVE-2019-9670","telemetryUrl":"https://glide-telemetry.pages.dev/kev/2022/#cve-2019-9670"}]}