CVE-2026-40472

CRITICAL

Hackage package metadata stored XSS vulnerability

Title source: cna

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.

References (1)

Core 1

Core References

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

Scores

CVSS v3 9.9

EPSS 0.0030

EPSS Percentile 21.7%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact total

Details

CWE

CWE-79

Status published

Published Apr 23, 2026

Tracked Since Apr 23, 2026