{"id":"CVE-2023-28427","aliases":["GHSA-mwq8-fjpf-c2gr"],"url":"https://o3.security/vulnerability/CVE-2023-28427","summary":"Prototype pollution in matrix-js-sdk","details":"### Impact\n\nIn certain configurations, data sent by remote servers containing special strings in key locations could cause modifications of the `Object.prototype`, disrupting matrix-js-sdk functionality, causing denial of service and potentially affecting program logic.\n\n(This is part 2, where [CVE-2022-36059](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-36059) / [GHSA-rfv9-x7hh-xc32](https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-rfv9-x7hh-xc32) is part 1. Part 2 covers remaining vectors not covered by part 1, found in a codebase audit scheduled after part 1.)\n\n### Patches\nThe issue has been patched in matrix-js-sdk 24.0.0.\n\n### Workarounds\nNone.\n\n### References\n\n- [Release blog post](https://matrix.org/blog/2023/03/28/security-releases-matrix-js-sdk-24-0-0-and-matrix-react-sdk-3-69-0)\n- The advisory [GHSA-rfv9-x7hh-xc32](https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-rfv9-x7hh-xc32) ([CVE-2022-36059](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-36059)) refers to an initial set of vulnerable locations discovered and patched in matrix-js-sdk 19.4.0. We opted not to disclose that advisory while we performed an audit of the codebase and are now disclosing it jointly with this one.\n\n### For more information\nIf you have any questions or comments about this advisory please email us at [security at matrix.org](mailto:security@matrix.org).\n","published":"2023-03-28T20:32:22.116Z","modified":"2026-09-15T03:46:10.927079880Z","cvss":{"score":8.2,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H"},"epss":{"score":0.01185,"percentile":0.64964,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"matrix-js-sdk","fixedVersion":"24.0.0"}],"fix":null,"references":[{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2023/04/msg00027.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/28xxx/CVE-2023-28427.json"},{"type":"ADVISORY","url":"https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-mwq8-fjpf-c2gr"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-28427"},{"type":"ADVISORY","url":"https://security.gentoo.org/glsa/202305-36"},{"type":"ADVISORY","url":"https://www.debian.org/security/2023/dsa-5392"},{"type":"ARTICLE","url":"https://matrix.org/blog/2023/03/28/security-releases-matrix-js-sdk-24-0-0-and-matrix-react-sdk-3-69-0"},{"type":"WEB","url":"https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-rfv9-x7hh-xc32"},{"type":"PACKAGE","url":"https://github.com/matrix-org/matrix-js-sdk"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-15T03:46:10.927079880Z"}}