{"answers":{"affected":"3 open source packages ship an affected version, including matrix-synapse. It affects 2 products.","exploited":"There is no known exploitation of CVE-2023-42453 in the wild and no public exploit code.","fix":"Upgrade matrix-synapse to 1.93.0 or later.","what":"CVE-2023-42453 is a low-severity vulnerability in Fedoraproject Fedora, published on 26 Sep 2023. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2023-42453 and fix it if it is affected.\n\nWhat it is: CVE-2023-42453 is a low-severity vulnerability in Fedoraproject Fedora, published on 26 Sep 2023. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2023-42453 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- matrix-synapse (PyPI): affected from 0.34.0; fixed in 1.93.0\n- matrix-synapse (PyPI): affected from 0.34.0; fixed in 1.93.0\n- matrix-synapse (PyPI): affected from 1.34.0; fixed in 1.93.0\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-2023-42453/ (Markdown: https://insights.sbomify.com/CVE-2023-42453/index.md)","id":"CVE-2023-42453","markdown":"https://insights.sbomify.com/CVE-2023-42453/index.md","name":"CVE-2023-42453","record":{"aliases":["GHSA-7565-cq32-vx2x","PYSEC-2023-180","UBUNTU-CVE-2023-42453"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["data_modify","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Matrix homeserver","requires_auth":"low_privilege","summary":"Attackers can forge read receipts for any event in Matrix Synapse, misleading clients about user activity without viewing the content.","user_interaction":"not_required","vuln_class":"business_logic"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"fedora","vendor":"fedoraproject"},{"product":"synapse","vendor":"matrix"}],"cvss":{"score":3.1,"severity":"low","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-285","name":"Improper Authorization"}],"description":"Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. Users were able to forge read receipts for any event (if they knew the room ID and event ID). Note that the users were not able to view the events, but simply mark it as read. This could be confusing as clients will show the event as read by the user, even if they are not in the room. This issue has been patched in version 1.93.0. Users are advised to upgrade. There are no known workarounds for this issue.","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":"Improper validation of receipts allows forged read receipts in matrix synapse","id":"CVE-2023-42453","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":"fedoraproject:fedora","products":["fedoraproject:fedora"],"type":"business_logic","year":"2023"},"n_packages":3,"n_references":6,"next":{"headline":"SQLpage vulnerable to public exposure of database credentials","id":"CVE-2023-42454"},"packages":[{"ecosystem":"PyPI","fixed":["1.93.0"],"introduced":["0.34.0"],"last_affected":[],"package":"matrix-synapse","purl":null,"source":"GHSA-7565-cq32-vx2x"},{"ecosystem":"PyPI","fixed":["1.93.0"],"introduced":["0.34.0"],"last_affected":[],"package":"matrix-synapse","purl":"pkg:pypi/matrix-synapse","source":"GHSA-7565-cq32-vx2x"},{"ecosystem":"PyPI","fixed":["1.93.0"],"introduced":["1.34.0"],"last_affected":[],"package":"matrix-synapse","purl":"pkg:pypi/matrix-synapse","source":"PYSEC-2023-180"}],"prev":{"headline":"Mastodon vulnerable to Stored XSS through the translation feature","id":"CVE-2023-42452"},"products":["synapse"],"published":"2023-09-26","related":[{"cvss_score":9.8,"headline":"PHP-CGI OS Command Injection","id":"CVE-2024-4577","kev_date_added":"2024-06-12","published":"2024-06-09"},{"cvss_score":9.8,"headline":"Grafana Authentication Bypass","id":"CVE-2021-39226","kev_date_added":"2022-08-25","published":"2021-10-05"},{"cvss_score":9.8,"headline":"VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow","id":"CVE-2019-5544","kev_date_added":"2021-11-03","published":"2019-12-06"},{"cvss_score":9.6,"headline":"Google Chromium V8 Type Confusion","id":"CVE-2024-4947","kev_date_added":"2024-05-20","published":"2024-05-15"},{"cvss_score":9.6,"headline":"Google Chromium Visuals Use-After-Free","id":"CVE-2024-4671","kev_date_added":"2024-05-13","published":"2024-05-09"},{"cvss_score":9.6,"headline":"Google Chromium Mojo Insufficient Data Validation","id":"CVE-2022-3075","kev_date_added":"2022-09-08","published":"2022-09-26"},{"cvss_score":9.6,"headline":"Google Chromium Indexed DB API Use-After-Free","id":"CVE-2021-30633","kev_date_added":"2021-11-03","published":"2021-10-08"}],"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":"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":"2025-06-18","vendors":["matrix-org"]},"summary":"Attackers can forge read receipts for any event in Matrix Synapse, misleading clients about user activity without viewing the content.","url":"https://insights.sbomify.com/CVE-2023-42453/"}