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CVE-2020-7796

Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery

9.8 CRITICALActively exploited (CISA KEV)EPSS 84.4%
  1. Published18 Feb 2020
  2. Added to CISA KEV17 Feb 2026
  3. Remediation due10 Mar 2026
Actively exploited (CISA KEV)

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

Added to KEV: 17 Feb 2026Federal remediation due: 10 Mar 2026

Description

Zimbra Collaboration Suite (ZCS) before 8.8.15 Patch 7 allows SSRF when WebEx zimlet is installed and zimlet JSP is enabled.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Synacor Zimbra Collaboration Suite< 8.8.15 · 8.8.15

Remediation

Fixed in
Synacor Zimbra Collaboration Suite≥ 8.8.15

References

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Frequently asked

Is CVE-2020-7796 being actively exploited?

Yes. CVE-2020-7796 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 17 Feb 2026.

How severe is CVE-2020-7796?

CVE-2020-7796 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 84.4% probability of exploitation.

Which products are affected by CVE-2020-7796?

Affected products include Synacor Zimbra Collaboration Suite.

How do I fix CVE-2020-7796?

Upgrade affected software to a fixed version, for example Synacor Zimbra Collaboration Suite 8.8.15 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2020-7796 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.