Missing Authorization in Zammad - #VU153211
Published: October 3, 2026
Vulnerability identifier: #VU153211
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-862
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to missing authorization in inline image handling in HTML notification emails when processing a crafted incoming email quoted in an HTML notification. A remote attacker can send a crafted email to cause arbitrary stored files to be included as attachments in a reply to disclose sensitive information.
Exploitation requires a trigger or scheduler configured to send notification emails that quote incoming messages in HTML.
Affected software
Zammad
Remediation
Install security update from vendor's website.
Zammad - update to 7.1.3