CVE-2022-24682: Used in ransomware campaigns — CISA KEV
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
CISA KEV — Actively Exploited
An issue was discovered in the Calendar feature in Zimbra Collaboration Suite 8
Vendor / Product
— / Synacor / Zimbra Collaborate Suite (ZCS)
CVSS / EPSS
6.1 MEDIUM · EPSS 30.93%
01What CISA says about this vulnerability
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.
02Required action — verbatim from CISA
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
03Notes & references
- blog.zimbra.com — https://blog.zimbra.com/2022/02/hotfix-available-5-feb-for-zero-day-exploit-vuln…
- wiki.zimbra.com — https://wiki.zimbra.com/wiki/Security_Center
- wiki.zimbra.com — https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P30
- wiki.zimbra.com — https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
- www.volexity.com — https://www.volexity.com/blog/2022/02/03/operation-emailthief-active-exploitatio…
- blog.zimbra.com — https://blog.zimbra.com/2022/02/hotfix-available-5-feb-for-zero-day-exploit-vuln…
- wiki.zimbra.com — https://wiki.zimbra.com/wiki/Security_Center
- wiki.zimbra.com — https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P30
- wiki.zimbra.com — https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
- www.volexity.com — https://www.volexity.com/blog/2022/02/03/operation-emailthief-active-exploitatio…
04SARA's analyst layer — why this matters
This vulnerability is currently on the CISA KEV list, which CISA only adds CVEs to when there is reliable evidence of active exploitation in the wild. For federal civilian agencies, BOD 22-01 requires remediation by the due date above. For everyone else, KEV is the strongest "patch immediately" signal you can get from public threat intel.
05Affected products (summary)
No structured affected-product list available — see references below for vendor advisories.
06Detection
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