Stored Cross-Site Scripting Vulnerability in GestSup API Logging
CVE-2026-22198

5.1MEDIUM

Key Information:

Vendor

Gestsup

Status
Gestsup
Vendor
CVE Published:
9 January 2026

What is CVE-2026-22198?

GestSup versions preceding 3.2.60 are susceptible to a stored cross-site scripting vulnerability within the API error logging mechanism. An unauthenticated attacker can exploit this by sending a specially crafted API request, manipulating the X-API-KEY header. This allows the attacker to inject malicious HTML or JavaScript into the logging entries. When an administrator reviews these logs via the web interface, the unencoded injected script executes within their browser, posing significant security risks. Mitigation measures are essential for affected versions to prevent exploitation.

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Affected Version(s)

GestSup 0 <= 3.2.56

References

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

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Geoffrey Robert and Valentin Holubec of Akailabs
VulnCheck
JSON
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