{"answers":{"affected":"It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-39840 exists.","fix":"No fix has been published for CVE-2026-39840 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-39840 is a medium-severity cross-site scripting vulnerability in Wikimedia Foundation Mediawiki - Cargo Extension, published on 7 Apr 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-39840 and fix it if it is affected.\n\nWhat it is: CVE-2026-39840 is a medium-severity cross-site scripting vulnerability in Wikimedia Foundation Mediawiki - Cargo Extension, published on 7 Apr 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-39840 exists.\n\nAffected product: Wikimedia Foundation Mediawiki - Cargo Extension. No package-level version data is available, so check the vendor advisory linked from the reference page.\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-2026-39840/ (Markdown: https://insights.sbomify.com/CVE-2026-39840/index.md)","id":"CVE-2026-39840","markdown":"https://insights.sbomify.com/CVE-2026-39840/index.md","name":"CVE-2026-39840","record":{"aliases":["GHSA-8m8x-w498-p4wx"],"analysis":{"component_type":"cms_plugin","fix_type":"upgrade","impacts":["code_execution","account_takeover"],"network_reachable":"yes","non_default_config":false,"product_category":"MediaWiki Cargo Extension","requires_auth":"low_privilege","summary":"Attackers can inject malicious CSS into MediaWiki pages via the Cargo extension, potentially leading to script execution or session hijacking.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"wikimedia-foundation","cpe":[{"product":"cargo","vendor":"mediawiki"}],"cvss":{"score":5.1,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","version":"4.0"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Wikimedia Foundation Mediawiki - Cargo Extension allows XSS Targeting Non-Script Elements.This issue affects Mediawiki - Cargo Extension: before 3.8.7.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":null,"headline":"CSS injection in multiple Cargo display formats","id":"CVE-2026-39840","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"xss","year":"2026"},"n_packages":0,"n_references":2,"next":{"headline":"Stored XSS through list fields on Cargo's page values and Special:CargoTables","id":"CVE-2026-39841"},"packages":[],"prev":{"headline":"Stored XSS through URLs in Cargo's map format","id":"CVE-2026-39839"},"products":["Mediawiki - Cargo Extension"],"published":"2026-04-07","related":[{"cvss_score":8.8,"headline":"Backticks can allow the usage of not-allowed SQL functions","id":"CVE-2024-47849","kev_date_added":null,"published":"2024-10-05"},{"cvss_score":6.9,"headline":"Cargo Extension: SQLi in Special:Drilldown","id":"CVE-2026-14363","kev_date_added":null,"published":"2026-07-01"},{"cvss_score":6.9,"headline":"Stored XSS through Cargo's map format","id":"CVE-2026-58519","kev_date_added":null,"published":"2026-07-01"},{"cvss_score":6.9,"headline":"SQLi in Cargo extension via year range filter","id":"CVE-2026-58521","kev_date_added":null,"published":"2026-07-01"},{"cvss_score":6.9,"headline":"Special:DeleteCargoTable and Special:SwitchCargoTable have no CSRF protection","id":"CVE-2024-47846","kev_date_added":null,"published":"2024-10-05"},{"cvss_score":6.9,"headline":"Various XSSes found in Cargo","id":"CVE-2024-47847","kev_date_added":null,"published":"2024-10-05"},{"cvss_score":6.3,"headline":"Stored XSS through the dynamic table format in Cargo","id":"CVE-2026-39837","kev_date_added":null,"published":"2026-04-07"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-04-07","vendors":["Wikimedia Foundation"]},"summary":"Attackers can inject malicious CSS into MediaWiki pages via the Cargo extension, potentially leading to script execution or session hijacking.","url":"https://insights.sbomify.com/CVE-2026-39840/"}