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CVE-2026-40470

9.9 · CRITICAL

A critical XSS vulnerability affected hackage-server and hackage.haskell.org.

Published Apr 23, 2026CWE-79EPSS 0.43%

Overview

CVE-2026-40470 is a critical-severity vulnerability. It was published on April 23, 2026 and has a CVSS 3.1 base score of 9.9 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.9, rated CRITICAL. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refosv.dev/vulnerability/HSEC-2024-0004

How CyberStrike helps

Frequently asked questions

What is CVE-2026-40470?

CVE-2026-40470 is a critical-severity vulnerability. It was published on April 23, 2026 and has a CVSS 3.1 base score of 9.9 (CRITICAL).

How severe is CVE-2026-40470?

This vulnerability has a CVSS 3.1 base score of 9.9, rated CRITICAL. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-40470?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-40470?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-40470 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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