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CVE-2026-56732: Zammad: Malicious input in Ticket Body Enables Session Termination

• Severity: medium (CVSS 5.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-25 · updated 2026-09-28
• Weakness: CWE-20

Description

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.2, vulnerability in Zammad's HTML sanitization allows injection of specific HTML elements into ticket bodies. When another user views the crafted ticket, the injected element can trigger a logout request, terminating the viewer's session. This vulnerability is fixed in 7.0.2.

Affected products

• zammad: before 7.0.2

References

• https://github.com/zammad/zammad/commit/3f6e8a5fa34eb0ce40f63292cf744f5f2992c9d0
• https://github.com/zammad/zammad/releases/tag/7.0.2
• https://github.com/zammad/zammad/security/advisories/GHSA-6rmm-28j9-q99q

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