XSS in Dbarzin Mercator
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (22.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 22nd percentile — 22.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000
Affected products
- Dbarzin Mercator — versions < 2026.02.22
- Sourcentis Mercator
Weakness classification (CWE)
References
- github.com/dbarzin/mercator/security/advisories/GHSA-65p7-pph2-966g (Mitigation, Vendor Advisory)
- github.com/dbarzin/mercator/commit/839d231399944e43a865198262e96e0218252cc3 (Patch)
- github.com/dbarzin/mercator/commit/9902ffd91f287e474729f514c77261f4ef7db8fe (Patch)
- github.com/dbarzin/mercator/commit/c58bb1d2fff18605c61d93cfaf77adca416c560a (Patch)
Frequently asked questions
- What is CVE-2026-27639?
- CVE-2026-27639 is a medium-severity vulnerability in Dbarzin Mercator, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-02-25.
- How severe is CVE-2026-27639?
- Medium severity. CVSS v3 base score is 5.4 out of 10.