Vulnerability · Published Sep 26, 2026 · Assigned by VulnCheck
CVE-2026-100522Cotonti through 1.0.0 Reflected XSS via message.php lng parameter
Medium 6.1
In plain English
A medium-severity cross-site scripting in Cotonti from Cotonti. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 11% of all known vulnerabilities).
Severity (CVSS 3.1)6.1Medium
Exploit odds (30 days)0.2%top 88.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Cotonti through 1.0.0 contains a reflected cross-site scripting vulnerability in message.php where the lng parameter is not properly escaped before output in the confirmation dialog. Unauthenticated attackers can craft malicious links with script payloads in the lng parameter to execute arbitrary JavaScript in victim browser sessions.
Affected products (as reported)
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
References
- https://github.com/Cotonti/Cotonti/issues/1907 issue-tracking
- https://github.com/Cotonti/Cotonti/pull/1908 issue-tracking, patch
- https://github.com/Cotonti/Cotonti/blob/1.0.0/message.php technical-description
- https://github.com/Cotonti/Cotonti product
- VulnCheck Advisory: Cotonti through 1.0.0 Reflected XSS via message.php lng parameter third-party-advisory