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    CVE-2022-24682

    An issue was discovered in the Calendar feature in Zimbra Collaboration Suite 8.8.x before 8.8.15 patch 30 (update 1), as exploited in the wild starting in December 2021. An attacker could place HTML containing executable JavaScript inside element attributes. This markup becomes unescaped, causing arbitrary markup to be injected into the document.

    Published:Feb 9, 2022
    Last Modified:Nov 4, 2025
    EPS:Feb 9, 2022
    EPSS Score:0.87378
    CVSS Score:6.1

    CISA Notification

    Description

    An issue was discovered in the Calendar feature in Zimbra Collaboration Suite 8.8.x before 8.8.15 patch 30 (update 1), as exploited in the wild starting in December 2021. An attacker could place HTML containing executable JavaScript inside element attributes. This markup becomes unescaped, causing arbitrary markup to be injected into the document.

    Required Action:

    Apply updates per vendor instructions.

    Notes:

    No extra notes provided.

    Due Date
    Mar 11, 2022
    1645 days ago
    Alert Date
    Feb 25, 2022
    1659 days ago

    Affected Products

    Vendor
    Synacor
    Product
    Zimbra Collaboration Suite

    Exploits

    https://www.volexity.com/blog/2022/02/03/operation-emailthief-active-exploitation-of-zero-day-xss-vulnerability-in-zimbra/https://www.volexity.com/blog/2022/02/03/operation-emailthief-active-exploitation-of-zero-day-xss-vulnerability-in-zimbra/

    Related CVEs

    CVE-2026-73576 (CVSS 6.3) — In Zimbra Collaboration (ZCS) before 10.1.17, weak cryptographic key generation vulnerability exists in the On…
    CVE-2026-73575 (CVSS 3.1) — In Zimbra Collaboration (ZCS) before 10.1.17, a Cross-Site Request Forgery (CSRF) vulnerability exists in the …
    CVE-2026-73574 (CVSS 3.1) — In Zimbra Collaboration before 10.1.17, a local file inclusion (LFI) vulnerability exists in the Zimbra Classi…
    CVE-2026-73573 (CVSS 3.1) — In Zimbra Collaboration (ZCS) before 10.1.17, a path traversal vulnerability exists in the Zimbra Briefcase do…
    CVE-2026-73572 (CVSS 6.1) — In Zimbra Collaboration (ZCS) before 10.1.17, a stored cross-site scripting (XSS) vulnerability exists in the …
    CVE-2026-73571 (CVSS 3.1) — An authorization bypass vulnerability exists in Zimbra Collaboration (ZCS) before 10.1.17 due to improper auth…
    CVE-2026-73570 (CVSS 8.9) — A remote code execution vulnerability exists in Zimbra Collaboration (ZCS) before 10.1.20 when the optional zi…
    CVE-2026-33373 (CVSS 8.8) — An issue was discovered in Zimbra Collaboration (ZCS) 10.0 and 10.1. A Cross-Site Request Forgery (CSRF) vulne…
    CVE-2026-33372 (CVSS 5.4) — An issue was discovered in Zimbra Collaboration (ZCS) 10.0 and 10.1. A cross-site request forgery (CSRF) vulne…
    CVE-2026-33370 (CVSS 6.1) — An issue was discovered in Zimbra Collaboration (ZCS) 10.0 and 10.1. A stored cross-site scripting (XSS) vulne…

    References

    https://blog.zimbra.com/2022/02/hotfix-available-5-feb-for-zero-day-exploit-vulnerability-in-zimbra-8-8-15/
    https://wiki.zimbra.com/wiki/Security_Center
    https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P30
    https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
    https://www.volexity.com/blog/2022/02/03/operation-emailthief-active-exploitation-of-zero-day-xss-vulnerability-in-zimbra/
    https://blog.zimbra.com/2022/02/hotfix-available-5-feb-for-zero-day-exploit-vulnerability-in-zimbra-8-8-15/
    https://wiki.zimbra.com/wiki/Security_Center
    https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P30
    https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
    https://www.volexity.com/blog/2022/02/03/operation-emailthief-active-exploitation-of-zero-day-xss-vulnerability-in-zimbra/
    https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-24682

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High