Vulnerability · Published Feb 25, 2026 · Assigned by GitHub_M

CVE-2026-27639Mercator vulnerable to stored XSS via unescaped Blade directives in display templates

High 8.5

In plain English

A high-severity cross-site scripting in mercator from dbarzin. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities).

Severity (CVSS 4.0)8.5High

Exploit odds (30 days)0.3%top 74.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
dbarzin	mercator	< 2026.02.22

Weakness: CWE-79 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

References

https://github.com/dbarzin/mercator/security/advisories/GHSA-65p7-pph2-966g x_refsource_CONFIRM
https://github.com/dbarzin/mercator/commit/839d231399944e43a865198262e96e0218252cc3 x_refsource_MISC
https://github.com/dbarzin/mercator/commit/9902ffd91f287e474729f514c77261f4ef7db8fe x_refsource_MISC
https://github.com/dbarzin/mercator/commit/c58bb1d2fff18605c61d93cfaf77adca416c560a x_refsource_MISC