Medium severity · published Sep 25, 2026
CVE-2026-63006
Zammad: HTML sanitizer API path allowlist bypass via interior path traversal in img src/srcset
5.3
CVSS
0.5%
EPSS
No
On KEV
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 41% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ZA
zammad · zammad
< 7.1.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-63006
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-63006
x_refsource_CONFIRM
https://github.com/zammad/zammad/security/advisories/GHSA-33p2-cm7w-62g3
x_refsource_MISC
https://github.com/zammad/zammad/commit/856af85c12413087d6a74ffee25b16048a5ed8c3
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