What is GHSA-h5jf-rfhh-rx8c?

GHSA-h5jf-rfhh-rx8c is a security advisory published by GitHub Security Advisories with Critical severity. An unauthenticated calendar sender can place active markup in a COUNTER message's RFC From...

Which CVE IDs does GHSA-h5jf-rfhh-rx8c cover?

GHSA-h5jf-rfhh-rx8c covers the following CVE IDs: CVE-2026-93647. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-h5jf-rfhh-rx8c?

GHSA-h5jf-rfhh-rx8c has a CVSS v3 base score of 9.3, published by GitHub Security Advisories.

GHSA-h5jf-rfhh-rx8cCriticalCVSS 9.3

An unauthenticated calendar sender can place active markup in a COUNTER message's RFC From...

Vendor

GitHub Security Advisories

Published

September 25, 2026

Last Modified

September 25, 2026

🔗 CVE IDs covered (1)

CVE-2026-93647 →

📋 Description

An unauthenticated calendar sender can place active markup in a COUNTER message's RFC From address. Selecting the message in Zimbra Classic triggers stored XSS, allowing the attacker to access mailbox data and act as the victim.

🔗 References (3)

https://nvd.nist.gov/vuln/detail/CVE-2026-93647
https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
https://github.com/advisories/GHSA-h5jf-rfhh-rx8c