What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-25 · updated 2026-09-29
• Weakness: CWE-22

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

• zammad: before 7.1.2

References

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

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