{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-91819 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-91819 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-91819 is a medium-severity vulnerability in MISP, published on 15 Sep 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-2026-91819 and fix it if it is affected.\n\nWhat it is: CVE-2026-91819 is a medium-severity vulnerability in MISP, published on 15 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2026-91819 in the wild and no public exploit code.\n\nAffected product: MISP. 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-2026-91819/ (Markdown: https://insights.sbomify.com/CVE-2026-91819/index.md)","id":"CVE-2026-91819","markdown":"https://insights.sbomify.com/CVE-2026-91819/index.md","name":"CVE-2026-91819","record":{"aliases":["GHSA-fx6r-c922-6mvg"],"analysis":{"component_type":"web_application","fix_type":"patch","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"MISP threat sharing","requires_auth":"low_privilege","summary":"Attackers can bypass CSRF and form validation in MISP by using HTTP method overrides, allowing unauthorized actions via crafted cross-site requests.","user_interaction":"required","vuln_class":"csrf"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"CIRCL","cpe":[],"cvss":{"score":6.9,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-352","name":"Cross-Site Request Forgery"},{"id":"CWE-20","name":"Improper Input Validation"}],"description":"Affected versions of MISP rely on CakePHP request-method override processing in a way that can disable CSRF and form-security validation.\n\nCakePHP honors a _method field or X-HTTP-Method-Override header by rewriting the effective request method. For override values outside the normal write verbs POST, PUT, PATCH, and DELETE, CakePHP also clears the parsed request body. MISP’s security component then determines whether to perform _validatePost() and _validateCsrf() based on whether request data remains. With a value such as:\n\n_method=GET\n\nthe body becomes empty before those checks run, so both protections are skipped. A cross-site form containing only that override can therefore reach actions whose parameters are taken from the URL rather than the request body\n\nVersion affected: ≤2.5.45","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":false,"headline":"MISP: HTTP Method Override Bypasses CSRF and Form Validation in BetterSecurityComponent","id":"CVE-2026-91819","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"csrf","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"MISP: Missing Authorization Check for Event Sharing Group When Distribution Field Is Omitted During Edit","id":"CVE-2026-91825"},"packages":[],"prev":{"headline":"Foxit PDF Editor/Reader Annotation Use-After-Free Remote Code Execution Vulnerability","id":"CVE-2026-91818"},"products":["MISP"],"published":"2026-09-15","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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":"partial"},"state":"PUBLISHED","updated":"2026-09-15","vendors":["MISP"]},"summary":"Attackers can bypass CSRF and form validation in MISP by using HTTP method overrides, allowing unauthorized actions via crafted cross-site requests.","url":"https://insights.sbomify.com/CVE-2026-91819/"}