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CVE-2026-40470— Hackage package and doc upload stored XSS vulnerability

Quick assessment

Affected
CVE-2026-40470
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

hackage-server是Haskell开源的一个Haskell软件包仓库服务器。 hackage-server存在跨站脚本漏洞，该漏洞源于HTML和JavaScript文件按原样提供，可能导致恶意包维护者劫持用户会话。

CVSS 9.9 · Critical EPSS 0.43% · P35

I. Basic Information for CVE-2026-40470

Vulnerability Information
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Vulnerability Title
Hackage package and doc upload stored XSS vulnerability
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
hackage-server 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
hackage-server是Haskell开源的一个Haskell软件包仓库服务器。 hackage-server存在跨站脚本漏洞，该漏洞源于HTML和JavaScript文件按原样提供，可能导致恶意包维护者劫持用户会话。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
- - 0.1 ~ 0.6 -

II. Public POCs for CVE-2026-40470

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III. Intelligence Information for CVE-2026-40470

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Vendor Advisories for CVE-2026-40470 (1)

IV. Related Vulnerabilities

Same weakness: CWE-79

V. Comments for CVE-2026-40470

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