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Back to active CVEs
High · CVSS 8.1CVE-2026-58205

GRR has a Reflected XSS issueCVE-2026-58205

Answer in brief

CVE-2026-58205 records a High severity (CVSS 8.1) vulnerability in GRR has a Reflected XSS issue. The current sources do not mark it as known exploited. The current feed maps JeromeDevome/GRR (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 27, 2026Updated Oct 27, 2026Source checked Oct 28, 2026First seen by HOL Oct 27, 2026Material review Oct 27, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.1
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 8.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps JeromeDevome/GRR (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
JeromeDevome/GRRgeneric<4.5.04.5.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for JeromeDevome/GRR.
  2. 2Review the reported fix. Update JeromeDevome/GRR to 4.5.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 27, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 27, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 27, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • GRR vulnerable to Remote Code Execution Via PHP Code InjectionSame jeromedevome/grr package
  • GRR vulnerable to Arbitrary File Read and DeletionSame jeromedevome/grr package
  • CKEditor: Cross-site scripting (XSS) in the engine packageAlso CWE-79
  • CKEditor: Cross-site scripting (XSS) in the engine packageAlso CWE-79
  • WebSub: Reflected script execution through intent-verification challengesAlso CWE-79

Record context

Vulnerability class
XSS
EPSS
Not reported
CWE IDs
CWE-79
Source
CVE List V5
Source checked
Oct 28, 2026
References
3 linked sources
Open source record