CVE-2026-40472 — CRITICAL (9.9)

Vulnerability Description

In hackage-server, user-controlled metadata from .cabal files are rendered into HTML href attributes without proper sanitization, enabling stored Cross-Site Scripting (XSS) attacks.

CVSS Score

9.9

CRITICAL

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

LOW

Related Weaknesses (CWE)

CWE-79

References

https://osv.dev/vulnerability/HSEC-2026-0004

FAQ

What is CVE-2026-40472?

CVE-2026-40472 is a vulnerability with a CVSS score of 9.9 (CRITICAL). In hackage-server, user-controlled metadata from .cabal files are rendered into HTML href attributes without proper sanitization, enabling stored Cross-Site Scripting (XSS) attacks.

How severe is CVE-2026-40472?

CVE-2026-40472 has been rated CRITICAL with a CVSS base score of 9.9/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-40472?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.