What is the CVSS score of CVE-2026-26991?

CVE-2026-26991 has a CVSS 3.1 base score of 4.8 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.0%.

Which versions of MySQL are affected by CVE-2026-26991?

Organizations using LibreNMS should be aware of moderate risk from CVE-2026-26991, a cross-site scripting vulnerability rated CVSS 4.8.. A patch is available.

Is there a public PoC exploit available for CVE-2026-26991?

Yes, a public proof-of-concept exploit is available for CVE-2026-26991. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-26991?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

MySQL CVE-2026-26991

MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2026-02-20 security-advisories@github.com

GHSA-5pqf-54qp-32wx

MySQL Redis SNMP XSS Librenms

4.8

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

4.8 MEDIUM

AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:04 vuln.today

PoC Detected

Feb 20, 2026 - 16:21 vuln.today

Public exploit code

Patch released

Feb 20, 2026 - 16:21 nvd

Patch available

CVE Published

Feb 20, 2026 - 03:15 nvd

MEDIUM 4.8

DescriptionGitHub Advisory

LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. In versions 26.1.1 and below, the device group name is not sanitized, allowing attackers with admin privileges to perform Stored Cross-Site Scripting (XSS) attacks. When a user adds a device group, an HTTP POST request is sent to the Request-URI "/device-groups". The name of the newly created device group is stored in the value of the name parameter. After the device group is created, the entry is displayed along with relevant buttons such as Rediscover Devices, Edit, and Delete. This issue has been fixed in version 26.2.0.

AnalysisAI

Stored XSS in LibreNMS versions 26.1.1 and below allows authenticated administrators to inject malicious scripts through unsanitized device group names, which execute when other users view the group management interface. Public exploit code exists for this vulnerability, affecting LibreNMS deployments across multiple supported platforms. …

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Vulnerability AssessmentAI

Risk Assessment	CVSS 4.8 (MEDIUM). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	A remote attacker (requires authentication) could exploit this vulnerability to compromise the affected system.
Remediation	A vendor patch is available — apply it immediately. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. …

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CVE-2026-26991 vulnerability details – vuln.today

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