{"answers":{"affected":"3 open source packages ship an affected version, including matrix-synapse. It affects 1 product.","exploited":"There is no known exploitation of CVE-2018-12423 in the wild and no public exploit code.","fix":"Upgrade matrix-synapse to 0.31.2 or later.","what":"CVE-2018-12423 is a high-severity missing authorization vulnerability in n/a, published on 14 Jun 2018. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2018-12423 and fix it if it is affected.\n\nWhat it is: CVE-2018-12423 is a high-severity missing authorization vulnerability in n/a, published on 14 Jun 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2018-12423 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- matrix-synapse (PyPI): affected all versions; fixed in 0.31.2\n- matrix-synapse (PyPI): affected all versions; fixed in 0.31.2\n- matrix-synapse (PyPI): affected all versions; fixed in 0.31.2\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-2018-12423/ (Markdown: https://insights.sbomify.com/CVE-2018-12423/index.md)","id":"CVE-2018-12423","markdown":"https://insights.sbomify.com/CVE-2018-12423/index.md","name":"CVE-2018-12423","record":{"aliases":["GHSA-ch5v-fhg8-7gv9","PYSEC-2026-844","UBUNTU-CVE-2018-12423"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["privilege_escalation","data_modify"],"network_reachable":"yes","non_default_config":false,"product_category":"Matrix homeserver","requires_auth":"none","summary":"Unauthenticated users can hijack Matrix rooms lacking power level events, allowing unauthorized control and modification of room state.","user_interaction":"not_required","vuln_class":"missing_authorization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"synapse","vendor":"matrix"}],"cvss":{"score":7.5,"severity":"high","source":"nvd","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","version":"3.0"},"cwes":[],"description":"In Synapse before 0.31.2, unauthorised users can hijack rooms when there is no m.room.power_levels event in force.","ecosystems":["PyPI"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Matrix Synapse Authorization Error","id":"CVE-2018-12423","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"missing_authorization","year":"2018"},"n_packages":3,"n_references":3,"next":{"headline":"File upload in n/a","id":"CVE-2018-12426"},"packages":[{"ecosystem":"PyPI","fixed":["0.31.2"],"introduced":["0"],"last_affected":[],"package":"matrix-synapse","purl":null,"source":"GHSA-ch5v-fhg8-7gv9"},{"ecosystem":"PyPI","fixed":["0.31.2"],"introduced":["0"],"last_affected":[],"package":"matrix-synapse","purl":"pkg:pypi/matrix-synapse","source":"GHSA-ch5v-fhg8-7gv9"},{"ecosystem":"PyPI","fixed":["0.31.2"],"introduced":["0"],"last_affected":[],"package":"matrix-synapse","purl":"pkg:pypi/matrix-synapse","source":"PYSEC-2026-844"}],"prev":{"headline":"Memory corruption in n/a","id":"CVE-2018-12422"},"products":["n/a"],"published":"2018-06-14","related":[{"cvss_score":9.8,"headline":"Improper Verification of Cryptographic Signature in matrix-synapse","id":"CVE-2019-18835","kev_date_added":null,"published":"2019-11-07"},{"cvss_score":8.7,"headline":"Synapse allows a a malformed invite to break the invitee's `/sync`","id":"CVE-2024-52815","kev_date_added":null,"published":"2024-12-03"},{"cvss_score":8.2,"headline":"Synapse allows unsupported content types to lead to memory exhaustion","id":"CVE-2024-52805","kev_date_added":null,"published":"2024-12-03"},{"cvss_score":8.2,"headline":"Synapse can be forced to thumbnail unexpected file formats, invoking external, potentially untrustworthy decoders","id":"CVE-2024-53863","kev_date_added":null,"published":"2024-12-03"},{"cvss_score":7.5,"headline":"Synapse denial of service through media disk space consumption","id":"CVE-2024-37302","kev_date_added":null,"published":"2024-12-03"},{"cvss_score":7.5,"headline":"Matrix Synapse Security Filtering Flaw","id":"CVE-2018-12291","kev_date_added":null,"published":"2018-06-13"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"PyPA Advisory Database","prefix":"PYSEC"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-09-16","vendors":["n/a"]},"summary":"Unauthenticated users can hijack Matrix rooms lacking power level events, allowing unauthorized control and modification of room state.","url":"https://insights.sbomify.com/CVE-2018-12423/"}