{"id":"CVE-2026-30229","aliases":["BIT-parse-2026-30229","GHSA-79wj-8rqv-jvp5"],"url":"https://o3.security/vulnerability/CVE-2026-30229","summary":"Parse Server: Endpoint `/loginAs` allows `readOnlyMasterKey` to gain full read and write access as any user","details":"### Impact\n\nThe `readOnlyMasterKey` can call `POST /loginAs` to obtain a valid session token for any user. This allows a read-only credential to impersonate arbitrary users with full read and write access to their data. Any Parse Server deployment that uses `readOnlyMasterKey` is affected.\n\n### Patches\n\nThe fix adds a check to the `/logInAs` handler.\n\n### Workarounds\n\nThere is no workaround other than not using `readOnlyMasterKey`.\n\n### References\n\n- GitHub security advisory: https://github.com/parse-community/parse-server/security/advisories/GHSA-79wj-8rqv-jvp5\n- Fix for Parse Server 9: https://github.com/parse-community/parse-server/releases/tag/9.5.0-alpha.4\n- Fix for Parse Server 8: https://github.com/parse-community/parse-server/releases/tag/8.6.6","published":"2026-03-06T20:26:53.787Z","modified":"2026-10-28T02:30:26.074852314Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"parse-server","fixedVersion":"8.6.6"},{"ecosystem":"npm","name":"parse-server","fixedVersion":"9.5.0-alpha.4"}],"fix":null,"references":[{"type":"WEB","url":"https://github.com/parse-community/parse-server/releases/tag/8.6.6"},{"type":"WEB","url":"https://github.com/parse-community/parse-server/releases/tag/9.5.0-alpha.4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30229.json"},{"type":"ADVISORY","url":"https://github.com/parse-community/parse-server/security/advisories/GHSA-79wj-8rqv-jvp5"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-30229"},{"type":"PACKAGE","url":"https://github.com/parse-community/parse-server"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T02:30:26.074852314Z"}}