How severe is CVE-2025-66939?

CVE-2025-66939 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2025-66939 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-66939?

CVE-2025-66939 affects Altumcode 66biolinks. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-66939?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-66939 have an EU (EUVD) identifier?

Yes. CVE-2025-66939 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-1914.

When was CVE-2025-66939 published?

CVE-2025-66939 was published on 2026-01-12 and last updated on 2026-06-17.

CVE-2025-66939

CVE-2025-66939 is a medium-severity vulnerability in Altumcode 66biolinks with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 0% (13th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-1914
Weakness: CWE-79
Affected product: Altumcode 66biolinks
Published: 2026-01-12
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2025-66939?: Cross Site Scripting vulnerability in 66biolinks by AltumCode v.61.0.1 allows an attacker to execute arbitrary code via a crafted favicon file
How severe is CVE-2025-66939?: CVE-2025-66939 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2025-66939 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-66939?: CVE-2025-66939 affects Altumcode 66biolinks. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-66939?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-66939 have an EU (EUVD) identifier?: Yes. CVE-2025-66939 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-1914.
When was CVE-2025-66939 published?: CVE-2025-66939 was published on 2026-01-12 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:altumcode:66biolinks:61.0.1:*:*:*:*:*:*:*

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