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CVE-2025-66939VulnerabilityPublished

CVE-2025-66939: 66biolinks · n/a

Affects 66biolinksSource CVE Database V5

0

Not known to be exploited · CVSS 5.4 Medium.

Data as of 26 Oct 2026, 08:30 UTC

CVSS 3.1 base score
5.4Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.2% chance of exploitation in 30 days – higher than 18% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 12 Jan 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
Packagistaltumcode/66biolinkspkg:composer/altumcode/66biolinksOther threatsAffected
  • =61.0.1
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Organizations should immediately review their use of 66biolinks version 61.0.1 and restrict or monitor favicon file uploads or references. Implement strict input validation and sanitization for all file uploads, including favicons, ensuring that only valid image formats without embedded scripts are accepted. Employ Content Security Policy (CSP) headers to limit the execution of unauthorized scripts in browsers. Monitor web application logs for unusual favicon upload activity or errors related to favicon processing. Engage with AltumCode to obtain patches or updates addressing this vulnerability and apply them promptly once available. Additionally, conduct security awareness training for developers and administrators on the risks of XSS via non-traditional vectors like favicon files. Consider deploying web application firewalls (WAFs) with rules targeting malicious favicon payloads as an interim protective measure. Finally, perform regular security testing and code reviews focusing on input handling and file processing components.

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

References

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