Exploited vulnerabilities / CVE-2020-7796
Confirmed exploited · server-side request forgery · Synacor Zimbra Collaboration SuiteCVE-2020-7796
Synacor Zimbra Collaboration Suite server-side request forgery, confirmed exploited in the wild.
Synacor Zimbra Collaboration Suite (ZCS) contains a server-side request forgery vulnerability if WebEx zimlet installed and zimlet JSP is enabled.
| CISA's name for it | Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery Vulnerability |
|---|---|
| Vendor and product | Synacor · Zimbra Collaboration Suite |
| Type | server-side request forgery · CWE-918 |
| Exploited | Confirmed by CISA listed 17 February 2026 |
| Likelihood | one of the most likely to be exploited of every vulnerability tracked |
| Deadline | 10 March 2026 · already passed |
| Used in ransomware | Not reported |
| Advisories | wiki.zimbra.com ↗ · nvd.nist.gov ↗ |
Three steps, in this order
Apply the vendor's fix or mitigation; CISA lists only vulnerabilities seen exploited.
If you cannot patch now, restrict network access to the affected product.
Check for signs of compromise since the date it was added to the list.
| CISA's required action | Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. |
|---|
Know before someone else finds it
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CVE-2020-7796 in short
Is CVE-2020-7796 being exploited?
Yes. CISA added CVE-2020-7796 to its Known Exploited Vulnerabilities catalogue on 17 February 2026, which it does only on evidence of exploitation in the wild.
What is the CISA deadline for CVE-2020-7796?
US federal agencies must remediate it by 10 March 2026. Everyone else should treat that date as the latest safe point to patch an internet-facing system.
How likely is CVE-2020-7796 to be exploited in the next 30 days?
FIRST's Exploit Prediction Scoring System gives it 94%, the 99th percentile of every CVE it scores.
How do I fix CVE-2020-7796?
Apply the vendor's fix or mitigation; CISA lists only vulnerabilities seen exploited. If you cannot patch now, restrict network access to the affected product. Check for signs of compromise since the date it was added to the list.
Other Synacor vulnerabilities being exploited
| CVE | Product | Type | Listed |
|---|---|---|---|
| CVE-2026-73570 | Zimbra Collaboration Suite (ZCS) | command injection | 21 August 2026 |
| CVE-2025-48700 | Zimbra Collaboration Suite (ZCS) | cross-site scripting | 20 April 2026 |
| CVE-2025-66376 | Zimbra Collaboration Suite (ZCS) | cross-site scripting | 18 March 2026 |
| CVE-2025-68645 | Zimbra Collaboration Suite (ZCS) | exploited vulnerability | 22 January 2026 |
Sources: CISA Known Exploited Vulnerabilities catalogue (released 10 November 2026) and FIRST EPSS. Page compiled automatically by SAK T.L.M, the threat-intelligence tool of SAK T.E.C, on 13 November 2026.