{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-85238 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-85238 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-85238 is a high-severity authentication bypass vulnerability in Misp-Project Misp, published on 3 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-85238 and fix it if it is affected.\n\nWhat it is: CVE-2026-85238 is a high-severity authentication bypass vulnerability in Misp-Project Misp, published on 3 Sep 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-2026-85238 in the wild and no public exploit code.\n\nAffected product: Misp-Project 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-2026-85238/ (Markdown: https://insights.sbomify.com/CVE-2026-85238/index.md)","id":"CVE-2026-85238","markdown":"https://insights.sbomify.com/CVE-2026-85238/index.md","name":"CVE-2026-85238","record":{"aliases":["GHSA-q8j2-7wc6-q8m4"],"analysis":{"component_type":"web_application","fix_type":"patch","impacts":["account_takeover"],"network_reachable":"yes","non_default_config":true,"product_category":"MISP threat sharing","requires_auth":"low_privilege","summary":"Attackers can hijack user sessions in MISP when CustomAuth is enabled by reusing pre-authentication session identifiers, leading to unauthorized account access.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"CIRCL","cpe":[{"product":"misp","vendor":"misp-project"}],"cvss":{"score":7.6,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-384","name":"Session Fixation"}],"description":"MISP contains a session fixation vulnerability in the CustomAuth authentication (a custom configuration) flow. When a user was successfully authenticated through CustomAuth, MISP stored the authenticated user identity in the existing session without first rotating the session identifier.\n\nAs a result, if an attacker can cause a victim to use a session identifier known to the attacker before authentication, that same session identifier remains valid after the victim successfully authenticates. The attacker could subsequently reuse the fixed session identifier to access the victim's authenticated MISP session, potentially gaining the privileges associated with the victim's account.\n\nThe issue occurs because __customAuthentication() wrote the authenticated user into the existing CakePHP session while the call to Session-\u003erenew() had previously been disabled. The patch restores session identifier rotation when a new authentication occurs or when the authenticated user changes, while avoiding unnecessary session renewal on every request.","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":"Session Fixation in MISP CustomAuth Authentication Allows Session Hijacking","id":"CVE-2026-85238","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"misp-project:misp","products":["misp-project:misp"],"type":"auth_bypass","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"MISP Event Template Definition Validation Bypass Allows Persistent Denial of Service","id":"CVE-2026-85239"},"packages":[],"prev":{"headline":"Missing Rate Limiting in Email OTP Verification Allows Brute-Force Authentication Bypass","id":"CVE-2026-85237"},"products":["misp"],"published":"2026-09-03","related":[{"cvss_score":9.8,"headline":"Missing authorization in n/a","id":"CVE-2024-46918","kev_date_added":null,"published":"2024-09-15"},{"cvss_score":9.8,"headline":"Missing authorization in n/a","id":"CVE-2024-45509","kev_date_added":null,"published":"2024-09-01"},{"cvss_score":9.8,"headline":"File upload in n/a","id":"CVE-2024-29858","kev_date_added":null,"published":"2024-03-21"},{"cvss_score":9.8,"headline":"File upload in n/a","id":"CVE-2024-29859","kev_date_added":null,"published":"2024-03-21"},{"cvss_score":9.8,"headline":"File upload in n/a","id":"CVE-2024-25674","kev_date_added":null,"published":"2024-02-09"},{"cvss_score":9.8,"headline":"Missing authorization in n/a","id":"CVE-2024-25675","kev_date_added":null,"published":"2024-02-09"},{"cvss_score":9.8,"headline":"Missing authorization in n/a","id":"CVE-2023-50918","kev_date_added":null,"published":"2023-12-15"}],"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":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-09-03","vendors":["misp"]},"summary":"Attackers can hijack user sessions in MISP when CustomAuth is enabled by reusing pre-authentication session identifiers, leading to unauthorized account access.","url":"https://insights.sbomify.com/CVE-2026-85238/"}