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 Altumcode

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

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.