CVE-2026-40470
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BaseFortify

Publication date: 2026-04-23

Last updated on: 2026-04-24

Assigner: redhat-cnalr

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.
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Meta Information
Published
2026-04-23
Last Modified
2026-04-24
Generated
2026-06-16
EPSS Evaluated
2026-06-15
NVD
CVE-2026-40470
EUVD
EUVD-2026-25233
Affected Vendors & Products
Currently, no data is known.
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
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