What is the CVSS score of CVE-2026-27016?

CVE-2026-27016 has a CVSS 3.1 base score of 5.4 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.0%.

Which versions of MySQL are affected by CVE-2026-27016?

Organizations using LibreNMS should be aware of moderate risk from CVE-2026-27016, a cross-site scripting vulnerability rated CVSS 5.4.. A patch is available.

How to fix or mitigate CVE-2026-27016?

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-2026-27016

MEDIUM

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

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

GHSA-fqx6-693c-f55g

MySQL SNMP XSS Librenms

5.4

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

5.4 MEDIUM

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:04 vuln.today

Patch released

Feb 20, 2026 - 16:22 nvd

Patch available

CVE Published

Feb 20, 2026 - 02:16 nvd

MEDIUM 5.4

DescriptionGitHub Advisory

LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. Versions 24.10.0 through 26.1.1 are vulnerable to Stored XSS via the unit parameter in Custom OID. The Custom OID functionality lacks strip_tags() sanitization while other fields (name, oid, datatype) are sanitized. The unsanitized value is stored in the database and rendered without HTML escaping. This issue is fixed in version 26.2.0.

AnalysisAI

Stored cross-site scripting in LibreNMS versions 24.10.0 through 26.1.1 allows authenticated users to inject malicious scripts through the unsanitized unit parameter in Custom OID configurations, which are then executed when other users view the affected pages. An attacker with login credentials could exploit this to steal session tokens, perform actions on behalf of other administrators, or compromise the monitoring infrastructure. …

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Vulnerability AssessmentAI

Risk Assessment	CVSS 5.4 (MEDIUM). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	A remote attacker 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-2026-27016 vulnerability details – vuln.today

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