What is the CVSS score of CVE-2025-66939?

CVE-2025-66939 has a CVSS 3.1 base score of 5.4 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N. EPSS exploitation probability: 0.1%.

Which versions of 66biolinks are affected by CVE-2025-66939?

Organizations using Cross Site Scripting vulnerability in 66biolinks by AltumCode v.61.0.1 should be aware of moderate risk from CVE-2025-66939, a cross-site scripting vulnerability rated CVSS 5.4.

Is there a public PoC exploit available for CVE-2025-66939?

Yes, a public proof-of-concept exploit is available for CVE-2025-66939. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2025-66939?

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

66biolinks CVE-2025-66939

MEDIUM

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

2026-01-12 cve@mitre.org

XSS 66biolinks

5.4

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

5.4 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Jan 22, 2026 - 21:56 vuln.today

Public exploit code

CVE Published

Jan 12, 2026 - 16:16 nvd

MEDIUM 5.4

DescriptionCVE.org

Cross Site Scripting vulnerability in 66biolinks by AltumCode v.61.0.1 allows an attacker to execute arbitrary code via a crafted favicon file

AnalysisAI

Cross Site Scripting vulnerability in 66biolinks by AltumCode v.61.0.1 allows an attacker to execute arbitrary code via a crafted favicon file [CVSS 5.4 MEDIUM]

Technical ContextAI

Classified as CWE-79 (Cross-site Scripting (XSS)). Affects 66Biolinks. Cross Site Scripting vulnerability in 66biolinks by AltumCode v.61.0.1 allows an attacker to execute arbitrary code via a crafted favicon file

RemediationAI

Monitor vendor advisories for a patch. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.

CVE-2025-66939 vulnerability details – vuln.today

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