XSS in Jeromedevome Grr
CVE-2026-58205
GRR is a resource management and reservation application. Prior to version 4.5.0, `maj.php` reflects the `forcemaj` parameter without adequate escaping when installation files remain accessible. Removal of these files is not automatic. An attacker can craft a URL that executes arbitrary JavaScript in a victim's browser when the victim accesses it. This reflected cross-site scripting can enable phishing, redirection to malicious sites, cookie theft and session hijacking because the authentication cookie is not `HttpOnly`. This issue is fixed in version 4.5.0.
Vulnerability class: XSS (Cross-Site Scripting)
Published .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Jeromedevome Grr — versions < 4.5.0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-58205?
- CVE-2026-58205 is a high-severity vulnerability in Jeromedevome Grr, classified under Cross-site Scripting. CVSS score: 8.1/10. Published 2026-10-27.
- How severe is CVE-2026-58205?
- High severity. CVSS v3 base score is 8.1 out of 10.