Vulnerability · Published Sep 25, 2026 · Assigned by GitHub_M

CVE-2026-56732Zammad: Malicious input in Ticket Body Enables Session Termination

Medium 5.3

In plain English

A medium-severity improper input validation in zammad from zammad. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities).

Severity (CVSS 4.0)5.3Medium

Exploit odds (30 days)0.2%top 90.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.2, vulnerability in Zammad's HTML sanitization allows injection of specific HTML elements into ticket bodies. When another user views the crafted ticket, the injected element can trigger a logout request, terminating the viewer's session. This vulnerability is fixed in 7.0.2.

Affected products (as reported)

Vendor	Product	Versions
zammad	zammad	< 7.0.2

Weakness: CWE-20, CWE-352 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

References

https://github.com/zammad/zammad/security/advisories/GHSA-6rmm-28j9-q99q x_refsource_CONFIRM
https://github.com/zammad/zammad/commit/3f6e8a5fa34eb0ce40f63292cf744f5f2992c9d0 x_refsource_MISC
https://github.com/zammad/zammad/releases/tag/7.0.2 x_refsource_MISC