{"id":"CVE-2026-30938","aliases":["BIT-parse-2026-30938","GHSA-q342-9w2p-57fp"],"url":"https://o3.security/vulnerability/CVE-2026-30938","summary":"Parse Server has denylist `requestKeywordDenylist` keyword scan bypass through nested object placement","details":"### Impact\n\nThe `requestKeywordDenylist` security control can be bypassed by placing any nested object or array before a prohibited keyword in the request payload. This is caused by a logic bug that stops scanning sibling keys after encountering the first nested value. Any custom `requestKeywordDenylist` entries configured by the developer are equally by-passable using the same technique.\n\nAll Parse Server deployments are affected. The `requestKeywordDenylist` is enabled by default.\n\n### Patches\n\nThe fix replaces the recursive object scanner with an iterative stack-based traversal that processes all nested values without prematurely exiting the scan loop. This also eliminates a potential stack overflow on deeply nested payloads.\n\n### Workarounds\n\nUse a Cloud Code `beforeSave` trigger to validate incoming data for prohibited keywords across all classes.\n\n### References\n\n- GitHub security advisory: https://github.com/parse-community/parse-server/security/advisories/GHSA-q342-9w2p-57fp\n- Fix Parse Server 9: https://github.com/parse-community/parse-server/releases/tag/9.5.1-alpha.1\n- Fix Parse Server 8: https://github.com/parse-community/parse-server/releases/tag/8.6.12","published":"2026-03-10T16:34:02.930Z","modified":"2026-08-12T03:51:36.848051781Z","cvss":null,"epss":{"score":0.00393,"percentile":0.33174,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"parse-server","fixedVersion":"8.6.12"},{"ecosystem":"npm","name":"parse-server","fixedVersion":"9.5.1-alpha.1"}],"fix":null,"references":[{"type":"WEB","url":"https://github.com/parse-community/parse-server/releases/tag/8.6.12"},{"type":"WEB","url":"https://github.com/parse-community/parse-server/releases/tag/9.5.1-alpha.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30938.json"},{"type":"ADVISORY","url":"https://github.com/parse-community/parse-server/security/advisories/GHSA-q342-9w2p-57fp"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-30938"},{"type":"PACKAGE","url":"https://github.com/parse-community/parse-server"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:36.848051781Z"}}