{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-46355 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-46355 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-46355 is a high-severity vulnerability in bigbluebutton, published on 20 Aug 2026."},"fix_prompt":"Check this codebase for CVE-2026-46355 and fix it if it is affected.\n\nWhat it is: CVE-2026-46355 is a high-severity vulnerability in bigbluebutton, published on 20 Aug 2026. \nExploitation: There is no known exploitation of CVE-2026-46355 in the wild and no public exploit code.\n\nAffected product: bigbluebutton. 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-2026-46355/ (Markdown: https://insights.sbomify.com/CVE-2026-46355/index.md)","id":"CVE-2026-46355","markdown":"https://insights.sbomify.com/CVE-2026-46355/index.md","name":"CVE-2026-46355","record":{"aliases":["GHSA-38fw-2gq7-ccgr"],"analysis":null,"analysis_generated_by":null,"assigner":"GitHub_M","cpe":[],"cvss":{"score":7.1,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-287","name":"Improper Authentication"}],"description":"BigBlueButton is an open-source virtual classroom. Prior to 3.0.23, BigBlueButton exposed /bigbluebutton/api/handleJoinExistingUser through bigbluebutton-web/grails-app/controllers/org/bigbluebutton/web/controllers/ApiController.groovy. A requester able to supply an existingUserID for an active participant could reuse that participant's session and impersonate the participant in the same meeting because handleJoinExistingUser was a routable controller action rather than a private helper. This issue is fixed in version 3.0.23.","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":"BigBlueButton: Unauthenticated Session Hijack via Exposed /bigbluebutton/api/handleJoinExistingUser","id":"CVE-2026-46355","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":null,"year":"2026"},"n_packages":0,"n_references":3,"next":{"headline":"Fleet: IP spoofing allows bypassing API rate limiting","id":"CVE-2026-46356"},"packages":[],"prev":{"headline":"Coder: PKCS#7 signature bypass in Azure instance identity allows unauthenticated agent token theft","id":"CVE-2026-46354"},"products":["bigbluebutton"],"published":"2026-08-20","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":"2026-08-25","vendors":["bigbluebutton"]},"summary":null,"url":"https://insights.sbomify.com/CVE-2026-46355/"}