CVE-2026-40472

9.9 criticalEPSS 0.3%

Critical (9.9). EPSS 0.3% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

9.9 critical

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

EPSS: 0.3% chance of exploitation in the next 30 days; higher than 23% of CVEs (scores of 2026-10-31)
CWE: CWE-79
Published: 2026-04-23
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

References

https://osv.dev/vulnerability/HSEC-2026-0004

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