Hackage package metadata stored XSS vulnerability

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Summary

CVECVE-2026-40472
StatePUBLISHED
Assignerredhat-cnalr
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-23 16:16:25 UTC
Updated2026-04-24 14:41:55 UTC
DescriptionIn hackage-server, user-controlled metadata from .cabal files are rendered into HTML href attributes without proper sanitization, enabling stored Cross-Site Scripting (XSS) attacks.

Risk And Classification

Primary CVSS: v3.1 9.9 CRITICAL from 74b3a70d-cca6-4d34-9789-e83b222ae3be

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

EPSS: 0.000460000 probability, percentile 0.141240000 (date 2026-04-24)

Problem Types: CWE-79 | CWE-79 CWE-79 Improper neutralization of input during web page generation ('cross-site scripting')

VersionSourceTypeScoreSeverityVector
3.174b3a70d-cca6-4d34-9789-e83b222ae3beSecondary9.9CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
3.1CNACVSS9.9CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
Low

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

References

ReferenceSourceLinkTags
osv.dev/vulnerability/HSEC-2026-0004 74b3a70d-cca6-4d34-9789-e83b222ae3be osv.dev
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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