Vulnerability
CVE-2026-63206
Descriptive record received from OpenCTI and minimised for consultation in the Intel portal.
- Sharing
- PUBLIC-OSINT
- Confidence
- 100
- Source
- The CVE Program
- Updated
- 26/09/2026 05:11
Description
Zammad is a web based open source helpdesk/customer support system. Prior to 7.1.2, zammad's HTML sanitizer, which blocks remote images in ticket articles and email views, can be bypassed using a shortened URL format that omits the double slash after the scheme (for example a shortened HTTP URL instead of a shortened HTTP URL). Modern browsers treat both forms as equivalent remote URLs. As a result, an attacker who sends a crafted email or ticket can cause the recipient's browser to silently load an image from an external server, revealing when and by whom the ticket was opened. Zammad's "remote content blocked" warning is not shown because the sanitizer does not recognize the shortened form as remote. This issue is fixed in version 7.1.2.
Aliases and classifications
CWE-184CWE-20Improper Input ValidationIncomplete List of Disallowed Inputs
Minimised technical details
No raw data- cisa kev
- False
Provenance
Public references
- https://github.com/zammad/zammad/commit/a5878f37e4010f0b3bec85dae35af964cc1c8019
https://github.com/zammad/zammad/commit/a5878f37e4010f0b3bec85dae35af964cc1c8019 - https://github.com/zammad/zammad/security/advisories/GHSA-fpwp-w2p4-hqg7
https://github.com/zammad/zammad/security/advisories/GHSA-fpwp-w2p4-hqg7
EudorIA correlation
Intel catalogue
The vulnerability is also available in the EudorIA editorial catalogue.
Open EudorIA analysisPresence in OpenCTI describes an intelligence correlation and does not, by itself, constitute evidence of compromise, legal attribution or operational guidance applicable without context verification.