CVE-2026-27639

Mercator is an open source web application designed to enable mapping of information systems. A stored Cross-Site Scripting (XSS) vulnerability exists in Mercator prior to version 2026.02.22 due to the use of unescaped Blade directives (`{!! !!}`) in display templates. An authenticated user with the User role can inject arbitrary JavaScript payloads into fields such as "contact point" when creating or editing entities. The payload is then executed in the browser of any user who views the affected page, including administrators. Version 2026.02.22 fixes the vulnerability.

• CWE-79

• https://github.com/dbarzin/mercator/commit/839d231399944e43a865198262e96e0218252cc3Patch
• https://github.com/dbarzin/mercator/commit/9902ffd91f287e474729f514c77261f4ef7db8fePatch
• https://github.com/dbarzin/mercator/commit/c58bb1d2fff18605c61d93cfaf77adca416c560aPatch
• https://github.com/dbarzin/mercator/security/advisories/GHSA-65p7-pph2-966gMitigation, Vendor Advisory

Published

Feb 25, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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