CVE-2026-58205 GRR - Reflected XSS

GRR prior to 4.5.0 contains a reflected XSS caused by inadequate escaping of the "forcemaj" parameter in maj.php when installation files remain accessible, letting attackers execute arbitrary JavaScript in victims' browsers, exploit requires accessible installation files.

CVSS base score 8.1 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.29% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Reflected XSS
Impact
Client Script Exec, Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Published
27 October 2026
Updated
29 October 2026
Weakness
CWE-79

Vendor fix

Update to version 4.5.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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