{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-91857 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-91857 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-91857 is a medium-severity vulnerability in MISP, published on 15 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-91857 and fix it if it is affected.\n\nWhat it is: CVE-2026-91857 is a medium-severity vulnerability in MISP, published on 15 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2026-91857 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-2026-91857/ (Markdown: https://insights.sbomify.com/CVE-2026-91857/index.md)","id":"CVE-2026-91857","markdown":"https://insights.sbomify.com/CVE-2026-91857/index.md","name":"CVE-2026-91857","record":{"aliases":["GHSA-6wvj-vm6h-rf24"],"analysis":{"component_type":"web_application","fix_type":"patch","impacts":["data_modify","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"MISP threat sharing","requires_auth":"none","summary":"Attackers can trigger state-changing actions like purging data or rebuilding caches via GET requests, exploiting authenticated user sessions.","user_interaction":"required","vuln_class":"csrf"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"CIRCL","cpe":[],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-352","name":"Cross-Site Request Forgery"}],"description":"Affected versions of MISP expose several state-changing controller actions without restricting them to POST.\n\nThe affected actions are:\n\n - EventReportsController::purgeUnusedPictures()\n\n - NoticelistsController::enableNoticelist()\n\n - ServersController::removeOrphanedCorrelations()\n\n - WorkflowsController::rebuildRedis()\n\nThe patch adds allowMethod(['post']) to each action, preventing them from being triggered through ordinary GET requests.\n\nFor purgeUnusedPictures(), the corresponding UI previously used $.get(). The fix converts that request to POST and supplies X-CSRF-Token, while the controller enables header-only CSRF validation for that AJAX action.\n\nBecause GET requests can be induced cross-origin through links, images, redirects, or navigation, accepting GET for these state-changing operations can let an attacker trigger them using the authenticated victim's session.\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: State-changing actions accessible via GET request enabling CSRF","id":"CVE-2026-91857","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"csrf","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"FopProducer transforms the incoming XSL-FO message body by creating a javax.xml.transform.TransformerFactory through TransformerFactory.newI","id":"CVE-2026-91858"},"packages":[],"prev":{"headline":"Open5GS PFCP Message handler.c denial of service","id":"CVE-2026-91855"},"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 trigger state-changing actions like purging data or rebuilding caches via GET requests, exploiting authenticated user sessions.","url":"https://insights.sbomify.com/CVE-2026-91857/"}