{"id":"CVE-2026-30965","aliases":["BIT-parse-2026-30965","GHSA-6r2j-cxgf-495f"],"url":"https://o3.security/vulnerability/CVE-2026-30965","summary":"Parse Server session token exfiltration via `redirectClassNameForKey` query parameter","details":"### Impact\n\nA vulnerability in Parse Server's query handling allows an authenticated or unauthenticated attacker to exfiltrate session tokens of other users by exploiting the `redirectClassNameForKey` query parameter. Exfiltrated session tokens can be used to take over user accounts.\n\nThe vulnerability requires the attacker to be able to create or update an object with a new relation field, which depends on the Class-Level Permissions of at least one class.\n\n### Patches\n\nThe fix applies the same security checks that normally protect class access after the query redirect, ensuring that queries redirected via `redirectClassNameForKey` are subject to the same restrictions as direct queries to the target class.\n\n### Workarounds\n\nSet restrictive Class-Level Permissions to prevent clients from creating new fields on classes, specifically by disabling `addField` for public access and unauthenticated users. Note that this limits client functionality and does not fully eliminate the risk if a relation field pointing to a protected class already exists in the schema.\n\n### References\n\n- GitHub security advisory: https://github.com/parse-community/parse-server/security/advisories/GHSA-6r2j-cxgf-495f\n- Fix Parse Server 9: https://github.com/parse-community/parse-server/releases/tag/9.5.2-alpha.8\n- Fix Parse Server 8: https://github.com/parse-community/parse-server/releases/tag/8.6.21","published":"2026-03-10T20:43:52.328Z","modified":"2026-08-12T03:51:32.022115324Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"parse-server","fixedVersion":"9.5.2-alpha.8"},{"ecosystem":"npm","name":"parse-server","fixedVersion":"8.6.21"}],"fix":null,"references":[{"type":"WEB","url":"https://github.com/parse-community/parse-server/releases/tag/8.6.21"},{"type":"WEB","url":"https://github.com/parse-community/parse-server/releases/tag/9.5.2-alpha.8"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30965.json"},{"type":"ADVISORY","url":"https://github.com/parse-community/parse-server/security/advisories/GHSA-6r2j-cxgf-495f"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-30965"},{"type":"PACKAGE","url":"https://github.com/parse-community/parse-server"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:32.022115324Z"}}