CVEvulnerability

CVE-2026-40470

9.9 CRITICAL Published 2026-04-23 Modified 2026-06-17 Official page ↗
Status
Awaiting Analysis
Published
2026-04-23
Last modified
2026-06-17
Assigner
74b3a70d-cca6-4d34-9789-e83b222ae3be
CVSS 3.1 (74b3a70d-cca6-4d34-9789-e83b222ae3be)
9.9 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
Weaknesses
CWE-79

Description

A critical XSS vulnerability affected hackage-server and hackage.haskell.org. HTML and JavaScript files provided in source packages or via the documentation upload facility were served as-is on the main hackage.haskell.org domain. As a consequence, when a user with latent HTTP credentials browses to the package pages or documentation uploaded by a malicious package maintainer, their session can be hijacked to upload packages or documentation, amend maintainers or other package metadata, or perform any other action the user is authorised to do.

Related

Weakness · CWE (1)

  • CWE-79 Improper Neutralization of Input During Web Page Generation weakness

References