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CVE-2026-27639

5.4 · MEDIUM

Mercator is an open source web application designed to enable mapping of information systems.

Published Feb 25, 2026CWE-79EPSS 0.32%

Overview

CVE-2026-27639 is a medium-severity vulnerability. It was published on February 25, 2026 and has a CVSS 3.1 base score of 5.4 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.4, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/dbarzin/mercator/commit/839d231399944e43a865198262e96e0218252cc3GitHubgithub.com/dbarzin/mercator/commit/9902ffd91f287e474729f514c77261f4ef7db8feGitHubgithub.com/dbarzin/mercator/commit/c58bb1d2fff18605c61d93cfaf77adca416c560aGitHubgithub.com/dbarzin/mercator/security/advisories/GHSA-65p7-pph2-966g

How CyberStrike helps

Frequently asked questions

What is CVE-2026-27639?

CVE-2026-27639 is a medium-severity vulnerability. It was published on February 25, 2026 and has a CVSS 3.1 base score of 5.4 (MEDIUM).

How severe is CVE-2026-27639?

This vulnerability has a CVSS 3.1 base score of 5.4, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-27639?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-27639?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-27639 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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