CVE-2025-66939Public exploitNetwork attack vector

Stored HTML injection via unsanitized SVG elements

Published Jan 12, 2026 · Updated Jan 12, 2026

Stored HTML injection in AltumCode 66biolinks 61.0.1 allows remote authenticated users to inject content through SVG favicons. The Biolink favicon upload sanitizer accepts SVG files without neutralizing embedded image and anchor elements, causing browsers to load attacker-selected resources and render deceptive links. An attacker must register, create a Biolink page, and persuade another user to open its favicon URL; demonstrated effects include tracking requests, phishing links, and referrer leakage, not JavaScript execution.

CVSS severity5.4
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored HTML injection in AltumCode 66biolinks 61.0.1 allows remote authenticated users to inject content through SVG favicons. The Biolink favicon upload sanitizer accepts SVG files without neutralizing embedded image and anchor elements, causing browsers to load attacker-selected resources and render deceptive links. An attacker must register, create a Biolink page, and persuade another user to open its favicon URL; demonstrated effects include tracking requests, phishing links, and referrer leakage, not JavaScript execution.

The record

CVE
CVE-2025-66939
Published
Jan 12, 2026
Updated
Jan 12, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.4CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
5.4NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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