SEPTEMBER 19, 2026
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Case File

CVE-2026-40470

CRITICAL · CVSS 9.9 EPSS 0.31%

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2026-04-23 · Last synced 2026-08-04

CyberRota Analysis

This is a critical severity vulnerability with a CVSS score of 9.9. It affects Java.

CVE
CVE-2026-40470
Severity
CRITICAL
CVSS
9.9
EPSS
0.31%
Java

Original NVD 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.