Paper/Archive/CVE-2026-40470

CVE-2026-40470

redhat-cnalr — Hackage package and doc upload stored XSS vulnerability

CVSS 9.9 (CNA)9.9 / 10 × 3029.7 Not in CISA KEV+300.0 EPSS percentile 23.8.238 × 204.8 No public exploit+100.0 SSVC exploitation: none+100.0

Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource

hackage-server0.1 – < 0.60.6CNA

Scores by source

redhat-cnalr (CNA)9.9CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L

CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refosv.dev/vulnerability/HSEC-2024-0004