CVE-2026-27639CWE-79

Mercator vulnerable to stored XSS via unescaped Blade directives in display templates

High · published February 25, 2026

CVSS v4.0
8.5
EPSS
0%
Percentile
24.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
8.5 · HIGH
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
EPSS
0.00324 · 24.2th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-02-25T03:44Z
EPSS history
Timeline
  • 25 FEB 03:44Z
    Mercator vulnerable to stored XSS via unescaped Blade directives in display templates
    cvelistv5