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CVE-2026-40470

CRITICAL
9.9
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-40470
State
PUBLISHED
Assigner
redhat-cnalr
Reserved
2026-04-13 15:23 UTC
Published
2026-04-23 14:53 UTC
Last updated
2026-04-23 16:22 UTC
Primary CWE
CWE-79
CWE-79 Improper neutralization of input during web page gene…
Sources
cve.org  ·  NVD

Severity & Metrics

9.9 CRITICAL CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
SSVC — CISA Coordinator
Exploitation
none
Automatable
no
Tech. Impact
total
Affected products (1)
VendorProductPlatformVersions
— — — 0.1 < 0.6
Weakness (CWE)
CWESourceDescription
CWE-79 cna CWE-79 Improper neutralization of input during web page generation ('cross-site scripting')
CVSS scores (1)
ScoreSeverityVersionSourceVector
9.9 CRITICAL 3.1 cna CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
References (1)
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