Vulnerability · Published Sep 25, 2026 · Assigned by GitHub_M

CVE-2026-63006Zammad: HTML sanitizer API path allowlist bypass via interior path traversal in img src/srcset

Medium 5.3

In plain English

A medium-severity path traversal 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 0.5% (higher than 42% of all known vulnerabilities).

Severity (CVSS 4.0)5.3Medium

Exploit odds (30 days)0.5%top 58.4% 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 7.1.2, attacker-controlled HTML in inbound emails or tickets could bypass the image URL sanitizer using path traversal sequences. When an authenticated agent views the content, the browser resolves the URL to a protected API endpoint and sends the request with the agent's session cookie, enabling side effects such as forced logout without any user interaction. This issue is fixed in version 7.1.2.

Affected products (as reported)

Vendor	Product	Versions
zammad	zammad	< 7.1.2

Weakness: CWE-22 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N

References

https://github.com/zammad/zammad/security/advisories/GHSA-33p2-cm7w-62g3 x_refsource_CONFIRM
https://github.com/zammad/zammad/commit/856af85c12413087d6a74ffee25b16048a5ed8c3 x_refsource_MISC