Vulnerability · Published Jan 9, 2026 · Assigned by VulnCheck

CVE-2026-22198GestSup < 3.2.60 Stored XSS in API Error Logs

Medium 5.1

In plain English

A medium-severity cross-site scripting in GestSup from GestSup. 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 22% of all known vulnerabilities).

Severity (CVSS 4.0)5.1Medium

Exploit odds (30 days)0.3%top 77.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

GestSup versions prior to 3.2.60 contain a pre-authentication stored cross-site scripting (XSS) vulnerability in the API error logging functionality. By sending an API request with a crafted X-API-KEY header value (for example, to /api/v1/ticket.php), an unauthenticated attacker can cause attacker-controlled HTML/JavaScript to be written to log entries. When an administrator later views the affected logs in the web interface, the injected content is rendered without proper output encoding, resulting in arbitrary script execution in the administrator’s browser session.

Affected products (as reported)

Vendor	Product	Versions
GestSup	GestSup	0 – before 3.2.60

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

References

https://gestsup.fr/index.php?page=changelog release-notes
https://www.vulncheck.com/advisories/gestsup-stored-xss-in-api-error-logs third-party-advisory