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Vulnerability record · CVE-2026-40470 · published 23 April 2026

CVE-2026-40470: Cross-site scripting vulnerability

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.

9.9 CVSS 3.1 Critical EPSS 0.43% · top 65.6% CWE-79 · Cross-site scripting Awaiting Analysis
9.9CVSS 3.1 base score
0.43%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
1References
17 Jun 2026Last modified by NVD

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.

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

References

LinkTags
https://osv.dev/vulnerability/HSEC-2024-0004

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Source: NIST National Vulnerability Database (record CVE-2026-40470), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.