What is CVE-2026-40470?

CVE-2026-40470 is a critical-severity vulnerability, classified under Cross-site Scripting. CVSS score: 9.9/10. Published 2026-04-23.

How severe is CVE-2026-40470?

Critical severity. CVSS v3 base score is 9.9 out of 10.

CVE-2026-40470

CVE-2026-40470

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 c…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.001 (18.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L.

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

osv.dev/vulnerability/HSEC-2024-0004

Frequently asked questions

What is CVE-2026-40470?: CVE-2026-40470 is a critical-severity vulnerability, classified under Cross-site Scripting. CVSS score: 9.9/10. Published 2026-04-23.
How severe is CVE-2026-40470?: Critical severity. CVSS v3 base score is 9.9 out of 10.