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CVE-2026-63206

Zammad: Remote image tracking bypass via shortened URL scheme

MEDIUM
5.3
CVSS Score
Published: September 25, 2026 at 06:14 PM UTC
Updated: September 28, 2026 at 02:45 PM UTC
1 product affected across 1 vendorZammad

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Zammad· Zammad
60%
v < 7.1.2
Affected range stops below 7.1.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

x_refsource_CONFIRM
Source: cverecord
https://github.com/zammad/zammad/security/advisories/GHSA-fpwp-w2p4-hqg7
x_refsource_MISC
Source: cverecord
https://github.com/zammad/zammad/commit/a5878f37e4010f0b3bec85dae35af964cc1c8019

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMGitHub_M
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-20CWE-184

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