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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
Low
Basic privileges needed
User Interaction
Passive
Minimal interaction
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 4
https://github.com/dbarzin/mercator/commit/839d231399944e43a865198262e96e021825…
security-advisories@github.com
https://github.com/dbarzin/mercator/commit/9902ffd91f287e474729f514c77261f4ef7d…
security-advisories@github.com
https://github.com/dbarzin/mercator/commit/c58bb1d2fff18605c61d93cfaf77adca416c…
security-advisories@github.com
https://github.com/dbarzin/mercator/security/advisories/GHSA-65p7-pph2-966g
security-advisories@github.com