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Vulnerability details: VCID-8xmh-99mq-ybbf
Vulnerability ID VCID-8xmh-99mq-ybbf
Aliases CVE-2026-30967
GHSA-fr88-w35c-r596
Summary Parse Server OAuth2 authentication adapter account takeover via identity spoofing The OAuth2 authentication adapter, when configured without the `useridField` option, only verifies that a token is active via the provider's token introspection endpoint, but does not verify that the token belongs to the user identified by `authData.id`. An attacker with any valid OAuth2 token from the same provider can authenticate as any other user. This affects any Parse Server deployment that uses the generic OAuth2 authentication adapter (configured with `oauth2: true`) without setting the `useridField` option.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-287 Improper Authentication
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 0.00127 https://api.first.org/data/v1/epss?cve=CVE-2026-30967
epss 0.00127 https://api.first.org/data/v1/epss?cve=CVE-2026-30967
epss 0.00127 https://api.first.org/data/v1/epss?cve=CVE-2026-30967
cvssv3.1_qr HIGH https://github.com/advisories/GHSA-fr88-w35c-r596
cvssv4 7.6 https://github.com/parse-community/parse-server
generic_textual HIGH https://github.com/parse-community/parse-server
cvssv4 7.6 https://github.com/parse-community/parse-server/releases/tag/8.6.22
generic_textual HIGH https://github.com/parse-community/parse-server/releases/tag/8.6.22
ssvc Track https://github.com/parse-community/parse-server/releases/tag/8.6.22
cvssv4 7.6 https://github.com/parse-community/parse-server/releases/tag/9.5.2-alpha.9
generic_textual HIGH https://github.com/parse-community/parse-server/releases/tag/9.5.2-alpha.9
ssvc Track https://github.com/parse-community/parse-server/releases/tag/9.5.2-alpha.9
cvssv3.1_qr HIGH https://github.com/parse-community/parse-server/security/advisories/GHSA-fr88-w35c-r596
cvssv4 7.6 https://github.com/parse-community/parse-server/security/advisories/GHSA-fr88-w35c-r596
generic_textual HIGH https://github.com/parse-community/parse-server/security/advisories/GHSA-fr88-w35c-r596
ssvc Track https://github.com/parse-community/parse-server/security/advisories/GHSA-fr88-w35c-r596
cvssv4 7.6 https://nvd.nist.gov/vuln/detail/CVE-2026-30967
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2026-30967
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-30967
https://github.com/parse-community/parse-server
https://github.com/parse-community/parse-server/releases/tag/8.6.22
https://github.com/parse-community/parse-server/releases/tag/9.5.2-alpha.9
CVE-2026-30967 https://nvd.nist.gov/vuln/detail/CVE-2026-30967
GHSA-fr88-w35c-r596 https://github.com/advisories/GHSA-fr88-w35c-r596
GHSA-fr88-w35c-r596 https://github.com/parse-community/parse-server/security/advisories/GHSA-fr88-w35c-r596
No exploits are available.
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/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:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N Found at https://github.com/parse-community/parse-server/releases/tag/8.6.22
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)

network

adjacent

local

physical

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present

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-11T15:24:03Z/ Found at https://github.com/parse-community/parse-server/releases/tag/8.6.22
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N Found at https://github.com/parse-community/parse-server/releases/tag/9.5.2-alpha.9
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)

network

adjacent

local

physical

low

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present

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passive

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-11T15:24:03Z/ Found at https://github.com/parse-community/parse-server/releases/tag/9.5.2-alpha.9
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N Found at https://github.com/parse-community/parse-server/security/advisories/GHSA-fr88-w35c-r596
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)

network

adjacent

local

physical

low

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present

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passive

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-11T15:24:03Z/ Found at https://github.com/parse-community/parse-server/security/advisories/GHSA-fr88-w35c-r596
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N Found at https://nvd.nist.gov/vuln/detail/CVE-2026-30967
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)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

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low

none

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none
Exploit Prediction Scoring System (EPSS)
Percentile 0.31698
EPSS Score 0.00127
Published At June 5, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-02T04:51:36.811393+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/npm/parse-server/CVE-2026-30967.yml 38.6.0