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Exploited vulnerability · CISA KEV

Is CVE-2020-7796 exploited? Yes: in CISA KEV since 17 Feb 2026

Gociux · Synacor Zimbra Collaboration Suite · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2020-7796, Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 17 Feb 2026, 2191 days after it was published. It affects Synacor Zimbra Collaboration Suite. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 17 Feb 2026
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity9.8CVSS 3.1 · critical
US federal due10 Mar 2026BOD 22-01 deadline

What it is

Synacor Zimbra Collaboration Suite (ZCS) contains a server-side request forgery vulnerability if WebEx zimlet installed and zimlet JSP is enabled.

VendorSynacor (19 exploited CVEs in KEV)
ProductZimbra Collaboration Suite
VulnerabilitySynacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery Vulnerability
WeaknessCWE-918
Published18 Feb 2020
Added to KEV17 Feb 2026
Reported by (CNA)mitre

What to do

  1. Check whether you run it. Look for Zimbra Collaboration Suite in your asset inventory, including appliances and cloud images. Stack check lists every exploited Synacor CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 18 Feb 2020.
  4. Get told next time. Email alerts when CISA adds a CVE for Synacor.

References

Questions

Is CVE-2020-7796 being exploited?

Yes. CISA added CVE-2020-7796 to the Known Exploited Vulnerabilities catalog on 17 Feb 2026, which means there is reliable evidence of exploitation in the wild.

Is CVE-2020-7796 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2020-7796?

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Check Synacor's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Zimbra Collaboration Suite and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in February 2026 · Synacor scorecard · act-now radar.

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