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VulnerabilityPublished Updated

CVE-2025-11539: grafana-image-renderer · Code Injection

Affects grafana-image-rendererSource CVE Database V5

0

Not known to be exploited · CVSS 9.9 Critical.

Data as of 26 Oct 2026, 17:16 UTC

CVSS 3.1 base score
9.9Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.6% chance of exploitation in 30 days – higher than 50% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 9 Oct 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
Grafana grafana-image-rendererAffected
  • =1.0.0
Fixed in–

AI-suggested

To mitigate CVE-2025-11539, organizations should take the following specific actions: 1) Immediately change the default authToken used by the grafana-image-renderer to a strong, unique token to prevent unauthorized access. 2) Restrict network access to the /render/csv endpoint by implementing network segmentation, firewall rules, or VPN access to limit exposure to trusted users only. 3) Monitor and audit access logs for any suspicious or unauthorized requests to the image renderer endpoints. 5) Employ runtime application self-protection (RASP) or endpoint detection and response (EDR) solutions to detect anomalous behavior indicative of exploitation attempts. 6) Conduct internal penetration testing focusing on the image renderer endpoints to verify that mitigations are effective. 7) Educate administrators about the risks of default credentials and enforce credential management policies. These steps go beyond generic advice by focusing on access control hardening, proactive monitoring, and immediate credential changes.

Description

Grafana Image Renderer is vulnerable to remote code execution due to an arbitrary file write vulnerability. This is due to the fact that the /render/csv endpoint lacked validation of the filePath parameter that allowed an attacker to save a shared object to an arbitrary location that is then loaded by the Chromium process. Instances are vulnerable if: 1. The default token ("authToken") is not changed, or is known to the attacker.2. The attacker can reach the image renderer endpoint. This issue affects grafana-image-renderer: from 1.0.0 through 4.0.16.

References

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