---
id: "CVE-2026-58205"
kind: "vulnerability"
aliases: ["CVE-2026-58205"]
title: "GRR resource reservation app: reflected XSS via maj.php forcemaj parameter"
severity: "high"
cvss: 8.1
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["grr", "package", "php", "self-hosted"]
not_affected_if: ["installation-files-removed"]
published_at: "2026-10-27T23:17:05+00:00"
first_seen_at: "2026-10-27T23:29:44+00:00"
updated_at: "2026-10-27T23:31:14+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-58205", "first_seen_at": "2026-10-27T23:29:44+00:00"}]
---

# GRR resource reservation app: reflected XSS via maj.php forcemaj parameter

GRR, a resource management and reservation application, reflects the forcemaj parameter in maj.php without escaping while installation files remain on the server. An attacker who gets a victim to open a crafted URL runs JavaScript in the victim's browser, and because the authentication cookie lacks HttpOnly, can steal the session.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check whether `maj.php` or the installation directory still exists on the GRR web root (unknown exact path in sources)
- Check the installed GRR version; affected versions are those before `4.5.0`

## Fix

- Upgrade GRR to `4.5.0` or later
- Remove the installation files after installing or upgrading, since removal is not automatic

## Timeline

- 2026-10-27T23:29:44+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-58205

## From the sources

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.

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