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

published 2020-02-18 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-28728

cvss: 9.8; version 3.1, CNA
cisa kev: Exploited; added 2026-02-17
epss: 93.6%; EPSS 93.6% chance of exploitation in 30 days, percentile 99.8%
public exploits: 0; none known, plus a Nuclei check

Patch / fix

cisa 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.

fixed in 1

synacor zimbra_collaboration_suite 8.8.15

Timeline

2020-02-18 Published
2026-02-17 CISA SSVC: exploitation active
2026-02-17 Added to CISA KEV
2026-03-10 CISA patch deadline

Known exploited

Added: 8 mo ago (2026-02-17)
Patch by: 2026-03-10 (8 mo ago)
Ransomware: Not known
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.
Vendor, product: Synacor, Zimbra Collaboration Suite
CISA name: Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery Vulnerability

CISA SSVC

Exploitation: Active, exploited in the wild
Automatable: yes
Technical impact: total
Assessed: 8 mo ago (2026-02-17)

Exploit prediction

93.59% chance of exploitation in the next 30 days, higher than 99.8% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

Nuclei template Zimbra Collaboration Suite < 8.8.15 Patch 7 - Server-Side Request Forgery nuclei detection template

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	6.8	AV:N/AC:M/Au:N/C:P/I:P/A:P

Classification

Weakness

CWE-918 Server-Side Request Forgery

References

wiki.zimbra.com /wiki/Zimbra_Releases/8.8.15/P7
release-notes, vendor-advisory
cisa.gov /known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-7796
government-resource, us-government-resource

Sources

CVE List CVE-2020-7796
NVD CVE-2020-7796

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary