{"answers":{"affected":"1 open source package ship an affected version, including hackage-server.","exploited":"There is no known exploitation of CVE-2026-40470 in the wild and no public exploit code.","fix":"Upgrade hackage-server to 0.6 or later.","what":"CVE-2026-40470 is a critical cross-site scripting vulnerability in hackage-server, published on 23 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-40470 and fix it if it is affected.\n\nWhat it is: CVE-2026-40470 is a critical cross-site scripting vulnerability in hackage-server, published on 23 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-40470 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- hackage-server (Hackage): affected from 0.1; fixed in 0.6\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-40470/ (Markdown: https://insights.sbomify.com/CVE-2026-40470/index.md)","id":"CVE-2026-40470","markdown":"https://insights.sbomify.com/CVE-2026-40470/index.md","name":"CVE-2026-40470","record":{"aliases":["GHSA-hxp4-rf8g-9mwq","HSEC-2024-0004"],"analysis":{"component_type":"web_application","fix_type":"patch","impacts":["account_takeover","data_modify"],"network_reachable":"yes","non_default_config":false,"product_category":"Hackage package repository","requires_auth":"low_privilege","summary":"Stored XSS in Hackage allows attackers to hijack user sessions via malicious package uploads, enabling unauthorized metadata changes and account takeover.","user_interaction":"not_required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"redhat-cnalr","cpe":[],"cvss":{"score":9.9,"severity":"critical","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L","version":"3.1"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"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.","ecosystems":["Hackage"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Hackage package and doc upload stored XSS vulnerability","id":"CVE-2026-40470","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"xss","year":"2026"},"n_packages":1,"n_references":1,"next":{"headline":"Hackage CSRF vulnerability","id":"CVE-2026-40471"},"packages":[{"ecosystem":"Hackage","fixed":["0.6"],"introduced":["0.1"],"last_affected":[],"package":"hackage-server","purl":"pkg:hackage/hackage-server","source":"HSEC-2024-0004"}],"prev":{"headline":"Heap buffer overflow in gawk","id":"CVE-2026-40469"},"products":[],"published":"2026-04-23","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"open","licence":"CC0 1.0","name":"Haskell Security Response Team","prefix":"HSEC"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-04-23","vendors":[]},"summary":"Stored XSS in Hackage allows attackers to hijack user sessions via malicious package uploads, enabling unauthorized metadata changes and account takeover.","url":"https://insights.sbomify.com/CVE-2026-40470/"}