{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-40470","assignerOrgId":"74b3a70d-cca6-4d34-9789-e83b222ae3be","state":"PUBLISHED","assignerShortName":"redhat-cnalr","dateReserved":"2026-04-13T15:23:17.067Z","datePublished":"2026-04-23T14:53:47.724Z","dateUpdated":"2026-04-23T16:22:27.341Z"},"containers":{"cna":{"providerMetadata":{"orgId":"74b3a70d-cca6-4d34-9789-e83b222ae3be","shortName":"redhat-cnalr","dateUpdated":"2026-04-23T14:53:47.724Z"},"title":"Hackage package and doc upload stored XSS vulnerability","datePublic":"2026-01-16T14:18:00.000Z","problemTypes":[{"descriptions":[{"lang":"en","cweId":"CWE-79","description":"CWE-79 Improper neutralization of input during web page generation ('cross-site scripting')","type":"CWE"}]}],"affected":[{"collectionURL":"https://hackage.haskell.org/package/hackage-server","packageName":"hackage-server","versions":[{"status":"affected","version":"0.1","lessThan":"0.6","versionType":"semver"}],"defaultStatus":"unaffected"}],"descriptions":[{"lang":"en","value":"A critical XSS vulnerability affected hackage-server and\nhackage.haskell.org.  HTML and JavaScript files provided in source\npackages or via the documentation upload facility were served\nas-is on the main hackage.haskell.org domain.  As a consequence,\nwhen a user with latent HTTP credentials browses to the package\npages or documentation uploaded by a malicious package maintainer,\ntheir session can be hijacked to upload packages or\ndocumentation, amend maintainers or other package metadata, or\nperform any other action the user is authorised to do.","supportingMedia":[{"type":"text/html","base64":false,"value":"A <strong>critical XSS vulnerability</strong> affected <em>hackage-server</em> and\n<code>hackage.haskell.org</code>.  HTML and JavaScript files provided in source\npackages or via the documentation upload facility were served\n<em>as-is</em> on the main <code>hackage.haskell.org</code> domain.  As a consequence,\nwhen a user with latent HTTP credentials browses to the package\npages or documentation uploaded by a malicious package maintainer,\ntheir <strong>session can be hijacked</strong> to upload packages or\ndocumentation, amend maintainers or other package metadata, or\nperform any other action the user is authorised to do."}]}],"references":[{"url":"https://osv.dev/vulnerability/HSEC-2024-0004"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"LOW","baseSeverity":"CRITICAL","baseScore":9.9,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L"}}],"x_generator":{"engine":"Vulnogram 1.0.1"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-23T16:19:40.142224Z","id":"CVE-2026-40470","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-04-23T16:22:27.341Z"}}]}}