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CVE-2026-40470

Hackage package and doc upload stored XSS 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.

CVSS 3.1 · 9.9 Critical EPSS < 1% KEV · Not listed
Vendors
Hackage-server
Products
Hackage-server
CVE-2026-40471

Hackage CSRF vulnerability

hackage-server lacked Cross-Site Request Forgery (CSRF) protection across its endpoints. Scripts on foreign sites could trigger requests to hackage server, possibly abusing latent credentials to upload packages or perform other administrative actions. Some unauthenticated actions could also be abused (e.g. creating new user accounts).

CVSS 3.1 · 9.6 Critical EPSS < 1% KEV · Not listed
Vendors
Hackage-server
Products
Hackage-server
CVE-2026-40472

Hackage package metadata stored XSS vulnerability

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.

CVSS 3.1 · 9.9 Critical EPSS < 1% KEV · Not listed
Vendors
Hackage-server
Products
Hackage-server