CVE-2026-58256: GRR vulnerable to Remote Code Execution Via PHP Code Injection
Advisory generated from the CVE record, CISA, Exploit Observer and VEDAS: what it is, whether it is exploited, who is affected, and how to fix and detect it.
Generated by VEDAS. Scores as of 2026-11-08 00:03 UTC. Rebuilt every few hours from cve-scores, CISA KEV and vedas-signatures. How this works and its limits.
What it is
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.
Description quoted from the CVE record (assigned by GitHub_M, published 2026-10-27).
Weakness: CWE-94: Improper Control of Generation of Code (‘Code Injection’)
How it can be exploited
Exploitable over the network with low attack complexity needing high privileges and no user interaction. Impact: confidentiality high, integrity high, availability high. CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CISA assessment (SSVC): CISA has no evidence of exploitation. Automatable: no. Technical impact: total.
Public exploit evidence (Exploit Observer)
Exploit Observer found 3 code repositories naming this CVE.
Code repositories that name a CVE are often scanners, copies or fakes, and some are malware. Read the code before running anything.
See all 4 references on Exploit Observer
Live scores
- EPSS
- 0.006
low predicted chance of attack - VEDAS
- 0.987
strong exploit evidence - On CISA KEV
- Not listed
- Detection rule
- Suricata
Who is affected
| Product | Affected | Not affected |
|---|---|---|
| JeromeDevome GRR | version < 4.5.0 | Not stated |
Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.
How to fix it
No fixed version or vendor advisory is listed in the CVE record yet. Watch the vendor’s security page.
How to detect it
Suricata rules (network detection)
1 rule that alert on traffic matching this exploit: VEDAS CVE-2026-58256 GRR - LDAP connector config PHP code injection RCE attempt. Add them to your Suricata rule set and reload.
Show the rules
alert http $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"VEDAS CVE-2026-58256 GRR - LDAP connector config PHP code injection RCE attempt"; flow:established,to_server; http.method; content:"POST"; http.request_body; content:"ldap_filter"; nocase; fast_pattern; pcre:"/ldap_filter[^&]{0,200}?(?:(?:system|exec|passthru|shell_exec|popen|proc_open|eval|assert|phpinfo|base64_decode)\x28|<\x3fphp)/i"; classtype:attempted-admin; reference:cve,CVE-2026-58256; reference:url,https://www.exploit.observer/?keyword=CVE-2026-58256&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=grr&match=exact; sid:1090002; rev:1;)
CVE-2026-58256.rules on GitHub
References
Other references
- https://github.com/JeromeDevome/GRR/security/advisories/GHSA-fp4f-xmw6-5jf8 (x_refsource_CONFIRM)
- https://github.com/JeromeDevome/GRR/commit/3ff9504ae557da1e8e208149acbf8c7f04de645f (x_refsource_MISC)
- https://github.com/JeromeDevome/GRR/tree/v4.5.0 (x_refsource_MISC)
Other databases
Where this comes from
This advisory is generated automatically by VEDAS from: CVE.org record, cve-scores (EPSS and VEDAS), Exploit Observer, vedas-signatures. Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.
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