# CVE-2026-58256: GRR vulnerable to Remote Code Execution Via PHP Code Injection

Status: published. Published: 2026-10-27. Updated: 2026-11-03.

GRR is a resource management and reservation application. Prior to the advisory-reported fixed version 4.5.0, an administrator can inject malicious PHP through LDAP connector configuration parameters such as `ldap_filter`, poisoning `/personnalisation/config_ldap.inc.php` and permitting remote code execution. The administrator must first successfully connect to an LDAP server, which can be attacker-controlled, and then submit malicious input on the subsequent connector settings page. The advisory reports this issue as fixed in version 4.5.0.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- JeromeDevome / GRR: < 4.5.0 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 3.1: 9.1 (critical); CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: 0.57% as of 2026-11-02; percentile 47.43%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-94

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/JeromeDevome/GRR/security/advisories/GHSA-fp4f-xmw6-5jf8 (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/JeromeDevome/GRR/commit/3ff9504ae557da1e8e208149acbf8c7f04de645f (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/JeromeDevome/GRR/tree/v4.5.0 (CNA: GitHub_M; x_refsource_MISC)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-58256; retrieved 2026-11-03; source updated 2026-11-03

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-58256; retrieved 2026-11-03; source updated Not reported

Revision: df1c82a0165dd19eed4b0cf5787381a0be19d94c411885fa5e70e06b770f0540

Canonical: https://y2.dev/cve/CVE-2026-58256

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