Vulnerability Description
Zammad is a web based open source helpdesk/customer support system. Prior to 7.1.2, a user with Knowledge Base editing rights for a category can embed a video widget in a published answer with a specially crafted value. When the answer is rendered, that value is inserted into the page's HTML without being escaped for its attribute context, allowing it to break out and inject additional HTML into the page. When another user who has permission to switch between user sessions views the affected answer, the injected HTML causes their browser to silently send a request to Zammad's session-switching endpoint using their own active credentials. This results in switching their session to an account chosen by the person who wrote the Knowledge Base answer. No action is required from the viewer beyond opening the published answer. This issue is fixed in version 7.1.2.
Related Weaknesses (CWE)
References
- https://github.com/zammad/zammad/commit/f7a97ea209696bce85ed62901ee753b88368851c
- https://github.com/zammad/zammad/security/advisories/GHSA-cxjg-4gmf-5xqc
FAQ
What is CVE-2026-84463?
CVE-2026-84463 is a documented vulnerability. Zammad is a web based open source helpdesk/customer support system. Prior to 7.1.2, a user with Knowledge Base editing rights for a category can embed a video widget in a published answer with a speci...
How severe is CVE-2026-84463?
CVSS scoring is not yet available for CVE-2026-84463. Check NVD for updates.
Is there a patch for CVE-2026-84463?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.