{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-55491 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-55491 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-55491 is a medium-severity cross-site scripting vulnerability in bigbluebutton, published on 20 Aug 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-2026-55491 and fix it if it is affected.\n\nWhat it is: CVE-2026-55491 is a medium-severity cross-site scripting vulnerability in bigbluebutton, published on 20 Aug 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-2026-55491 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-2026-55491/ (Markdown: https://insights.sbomify.com/CVE-2026-55491/index.md)","id":"CVE-2026-55491","markdown":"https://insights.sbomify.com/CVE-2026-55491/index.md","name":"CVE-2026-55491","record":{"aliases":["GHSA-57p5-c888-74f9"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["code_execution","account_takeover"],"network_reachable":"yes","non_default_config":false,"product_category":"Virtual classroom platform","requires_auth":"low_privilege","summary":"Attackers can inject scripts via meeting names that execute in other users' browsers during recording playback, potentially leading to session hijacking.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":5.4,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"BigBlueButton is an open-source virtual classroom. Prior to 3.0.29, BigBlueButton failed to escape meetingName in record-and-playback/screenshare/playback/index.html.erb when generating the screenshare playback format. A low-privileged user could store a crafted meeting name that embedded script content, and the script executed in another user's browser when that user replayed the recording. This issue is fixed in version 3.0.29.","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: Stored XSS in Screenshare Recording Playback via Unescaped Meeting Name","id":"CVE-2026-55491","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"xss","year":"2026"},"n_packages":0,"n_references":3,"next":{"headline":"Tugtainer: Unauthenticated access to Tugtainer Agent Docker management APIs when AGENT_SECRET is unset","id":"CVE-2026-55494"},"packages":[],"prev":{"headline":"OpenWrt: EAD Integer Underflow → Pre-Auth Denial of Service","id":"CVE-2026-55490"},"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":"2026-08-21","vendors":["bigbluebutton"]},"summary":"Attackers can inject scripts via meeting names that execute in other users' browsers during recording playback, potentially leading to session hijacking.","url":"https://insights.sbomify.com/CVE-2026-55491/"}