CVE-2026-56726: Auth Bypass

Description

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.2, this vulnerability breaks normal ticket isolation boundaries between agents. Any authenticated agent, even one with no active tickets assigned to them, can view the titles, status, labels, and URL links of GitHub/GitLab issues attached to any ticket in the system. This allows an internal user to systematically view GitHub/GitLab issue data linked by other agents or administrators across the organization by simply querying random or sequential ticket IDs. This vulnerability is fixed in 7.0.2.

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Weakness Type (CWE)

CWE-862 Missing Authorization

References

Other References

https://github.com/zammad/zammad/commit/c767f32c006ff9842152f78e12f355f7f485304f https://github.com/zammad/zammad/commit/e50ef69beab897317caa5e9490edba33aa1ac978 https://github.com/zammad/zammad/releases/tag/7.0.2 https://github.com/zammad/zammad/security/advisories/GHSA-96hh-fmj3-h4hp

Frequently Asked Questions

What is CVE-2026-56726? +

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.2, this vulnerability breaks normal ticket isolation boundaries between agents. Any authenticated agent, even one with no active tickets assigned to them, can view the titles, status, labels, and URL links of GitHub/GitLab issues attached to any ticket in the system. This allows an internal user to systematically view GitHub/GitLab issue data linked by other agents or administrators across the organization by simply querying random or sequential ticket IDs. This vulnerability is fixed in 7.0.2.

How do I check if I'm vulnerable to CVE-2026-56726? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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