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Threatist priority CRITICAL 0 HIGH 0 MEDIUM 0 LOW 2

Signals Exploited in the wild (KEV) 0 Patch available 2 No fix listed 0 Has CVE 2

Fix status Fixed 2 Partial 0 Will not fix 0 Deferred 0 No fix listed 0

Impact type Code execution 0 Privilege escalation 0 Security bypass 0 Information disclosure 0 Tampering 0 Denial of service 0 Spoofing 0 Cross-site scripting 2 SQL injection 0

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Requirements No authentication 2 No user interaction 0

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Weakness (CWE) CWE-79 Improper Neutralization of Input During Web Page Generation 2

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Release: Synacor Zimbra Collaboration 10.1.21 × Clear all filters

TI-2026-82517 CVE-2026-66912 · GHSA-rprc-q5mj-4mcw

Stored cross-site scripting in Zimbra Collaboration via From header

Priority LOW 24

Zimbra is vulnerable to Stored Cross-Site Scripting (XSS) via the From email header during HTML reply composition in Classic UI.

CVSS 4.0MEDIUM 5.3· Network · No auth · User interaction · EPSS 0.00467 · Published 2026-10-29 · Fixed in 10.1.21 CWE-79

TI-2026-82516 CVE-2026-66911 · GHSA-4r7g-97vg-fv7w

Stored cross-site scripting in Zimbra via email attachments

Priority LOW 25

Zimbra is vulnerable to stored cross-site scripting (XSS) via the Content-Location MIME header in email attachments.

CVSS 4.0MEDIUM 5.3· Network · No auth · User interaction · EPSS 0.0054 · Published 2026-10-29 · Fixed in 10.1.21 CWE-79

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