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Vulnerability details: VCID-j9vu-d52s-ekgq
Vulnerability ID VCID-j9vu-d52s-ekgq
Aliases CVE-2026-33624
GHSA-2299-ghjr-6vjp
Summary Parse Server: MFA recovery code single-use bypass via concurrent requests ### Impact An attacker who obtains a user's password and a single MFA recovery code can reuse that recovery code an unlimited number of times by sending concurrent login requests. This defeats the single-use design of recovery codes. The attack requires the user's password, a valid recovery code, and the ability to send concurrent requests within milliseconds. ### Patches The login handler now uses optimistic locking when updating auth data that contains consumed single-use tokens. If a concurrent request has already modified the recovery array, the update fails and the login is rejected. ### Workarounds There are no known workarounds.
Status Published
Exploitability 0.5
Weighted Severity 2.7
Risk 1.4
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.00032 https://api.first.org/data/v1/epss?cve=CVE-2026-33624
epss 0.00032 https://api.first.org/data/v1/epss?cve=CVE-2026-33624
epss 0.00032 https://api.first.org/data/v1/epss?cve=CVE-2026-33624
cvssv3.1_qr LOW https://github.com/advisories/GHSA-2299-ghjr-6vjp
cvssv4 2.1 https://github.com/parse-community/parse-server
generic_textual LOW https://github.com/parse-community/parse-server
cvssv4 2.1 https://github.com/parse-community/parse-server/commit/5e70094250a36bfcc14ecd49592be2b94fba66ff
generic_textual LOW https://github.com/parse-community/parse-server/commit/5e70094250a36bfcc14ecd49592be2b94fba66ff
ssvc Track https://github.com/parse-community/parse-server/commit/5e70094250a36bfcc14ecd49592be2b94fba66ff
cvssv4 2.1 https://github.com/parse-community/parse-server/commit/fc3da35a81d5083b453e8967cabcc880f1a3bd0c
generic_textual LOW https://github.com/parse-community/parse-server/commit/fc3da35a81d5083b453e8967cabcc880f1a3bd0c
ssvc Track https://github.com/parse-community/parse-server/commit/fc3da35a81d5083b453e8967cabcc880f1a3bd0c
cvssv4 2.1 https://github.com/parse-community/parse-server/pull/10275
generic_textual LOW https://github.com/parse-community/parse-server/pull/10275
ssvc Track https://github.com/parse-community/parse-server/pull/10275
cvssv4 2.1 https://github.com/parse-community/parse-server/pull/10276
generic_textual LOW https://github.com/parse-community/parse-server/pull/10276
ssvc Track https://github.com/parse-community/parse-server/pull/10276
cvssv3.1_qr LOW https://github.com/parse-community/parse-server/security/advisories/GHSA-2299-ghjr-6vjp
cvssv4 2.1 https://github.com/parse-community/parse-server/security/advisories/GHSA-2299-ghjr-6vjp
generic_textual LOW https://github.com/parse-community/parse-server/security/advisories/GHSA-2299-ghjr-6vjp
ssvc Track https://github.com/parse-community/parse-server/security/advisories/GHSA-2299-ghjr-6vjp
cvssv4 2.1 https://nvd.nist.gov/vuln/detail/CVE-2026-33624
generic_textual LOW https://nvd.nist.gov/vuln/detail/CVE-2026-33624
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-33624
https://github.com/parse-community/parse-server
https://github.com/parse-community/parse-server/commit/5e70094250a36bfcc14ecd49592be2b94fba66ff
https://github.com/parse-community/parse-server/commit/fc3da35a81d5083b453e8967cabcc880f1a3bd0c
https://github.com/parse-community/parse-server/pull/10275
https://github.com/parse-community/parse-server/pull/10276
https://github.com/parse-community/parse-server/security/advisories/GHSA-2299-ghjr-6vjp
https://nvd.nist.gov/vuln/detail/CVE-2026-33624
GHSA-2299-ghjr-6vjp https://github.com/advisories/GHSA-2299-ghjr-6vjp
No exploits are available.
Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N Found at https://github.com/parse-community/parse-server
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N Found at https://github.com/parse-community/parse-server/commit/5e70094250a36bfcc14ecd49592be2b94fba66ff
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-25T13:58:24Z/ Found at https://github.com/parse-community/parse-server/commit/5e70094250a36bfcc14ecd49592be2b94fba66ff
Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N Found at https://github.com/parse-community/parse-server/commit/fc3da35a81d5083b453e8967cabcc880f1a3bd0c
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-25T13:58:24Z/ Found at https://github.com/parse-community/parse-server/commit/fc3da35a81d5083b453e8967cabcc880f1a3bd0c
Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N Found at https://github.com/parse-community/parse-server/pull/10275
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-25T13:58:24Z/ Found at https://github.com/parse-community/parse-server/pull/10275
Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N Found at https://github.com/parse-community/parse-server/pull/10276
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-25T13:58:24Z/ Found at https://github.com/parse-community/parse-server/pull/10276
Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N Found at https://github.com/parse-community/parse-server/security/advisories/GHSA-2299-ghjr-6vjp
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-25T13:58:24Z/ Found at https://github.com/parse-community/parse-server/security/advisories/GHSA-2299-ghjr-6vjp
Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N Found at https://nvd.nist.gov/vuln/detail/CVE-2026-33624
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Exploit Prediction Scoring System (EPSS)
Percentile 0.09895
EPSS Score 0.00032
Published At June 5, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-04T16:59:34.335413+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-2299-ghjr-6vjp/GHSA-2299-ghjr-6vjp.json 38.6.0