{"answers":{"affected":"","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-63097 exists.","fix":"No fix has been published for CVE-2026-63097 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-63097 is a medium-severity missing authorization vulnerability in matrix-org dendrite, published on 17 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-63097 and fix it if it is affected.\n\nWhat it is: CVE-2026-63097 is a medium-severity missing authorization vulnerability in matrix-org dendrite, published on 17 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-63097 exists.\n\nAffected product: matrix-org dendrite. 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-2026-63097/ (Markdown: https://insights.sbomify.com/CVE-2026-63097/index.md)","id":"CVE-2026-63097","markdown":"https://insights.sbomify.com/CVE-2026-63097/index.md","name":"CVE-2026-63097","record":{"aliases":["GHSA-xq7h-2f2w-f2xq"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"Matrix homeserver","requires_auth":"low_privilege","summary":"Authenticated users who left a room can access current room state via the syncapi context endpoint, bypassing membership checks.","user_interaction":"not_required","vuln_class":"missing_authorization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-863","name":"Incorrect Authorization"}],"description":"Dendrite through 0.13.8 contains an improper access control vulnerability in the syncapi /context endpoint (syncapi/routing/context.go) that allows authenticated local users to access post-leave room state events by exploiting a flawed membership check that evaluates only the RoomExists field while ignoring IsInRoom, HasBeenInRoom, and Membership fields. Attackers who have left a room can call the rooms context API endpoint for a previously permitted event and receive unfiltered current room state that the /messages and /sync endpoints correctly withhold.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":false,"headline":"Dendrite 0.13.8 syncapi /context Endpoint Post-Leave State Exposure","id":"CVE-2026-63097","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"missing_authorization","year":"2026"},"n_packages":0,"n_references":2,"next":{"headline":"TheHive 4.1.24 Unauthenticated Information Disclosure via /api/status Endpoint","id":"CVE-2026-63098"},"packages":[],"prev":{"headline":"Dendrite 0.13.8 SSRF via Unauthenticated Legacy Media Download Endpoint","id":"CVE-2026-63096"},"products":["dendrite"],"published":"2026-07-17","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":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-07-28","vendors":["matrix-org"]},"summary":"Authenticated users who left a room can access current room state via the syncapi context endpoint, bypassing membership checks.","url":"https://insights.sbomify.com/CVE-2026-63097/"}