Home/CVE/In hackage-server, user-controlled metadata from .cabal files are rendered into HTML href attributes without proper sani
CVE

CVE-2026-40472

In hackage-server, user-controlled metadata from .cabal files are rendered into HTML href attributes without proper sani

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.

CRITICAL · CVSS 9.9 EPSS 0.00059
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
▣

Scoring & Timeline

9.9
CRITICAL · CVSS v3.1 · 74b3a70d-cca6-4d34-9789-e83b222ae3be
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD23 Apr 2026 · 04:16 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
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References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://osv.dev/vulnerability/HSEC-2026-0004
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