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Vulnerability details: VCID-crd1-u2dd-6yh2
Vulnerability ID VCID-crd1-u2dd-6yh2
Aliases CVE-2026-33538
GHSA-g4cf-xj29-wqqr
Summary Parse Server: Denial of Service via unindexed database query for unconfigured auth providers ### Impact An unauthenticated attacker can cause Denial of Service by sending authentication requests with arbitrary, unconfigured provider names. The server executes a database query for each unconfigured provider before rejecting the request, and since no database index exists for unconfigured providers, each request triggers a full collection scan on the user database. This can be parallelized to saturate database resources. ### Patches The fix validates that an authentication provider is configured before executing any database query. Requests with unconfigured providers are now rejected immediately without querying the database. ### Workarounds There is no known workaround other than upgrading.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-400 Uncontrolled Resource Consumption
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 0.00142 https://api.first.org/data/v1/epss?cve=CVE-2026-33538
epss 0.00142 https://api.first.org/data/v1/epss?cve=CVE-2026-33538
epss 0.00142 https://api.first.org/data/v1/epss?cve=CVE-2026-33538
cvssv3.1_qr HIGH https://github.com/advisories/GHSA-g4cf-xj29-wqqr
cvssv4 8.7 https://github.com/parse-community/parse-server
generic_textual HIGH https://github.com/parse-community/parse-server
cvssv4 8.7 https://github.com/parse-community/parse-server/commit/40eb442e02672986730007d0a1edb22c1c4bd357
generic_textual HIGH https://github.com/parse-community/parse-server/commit/40eb442e02672986730007d0a1edb22c1c4bd357
ssvc Track https://github.com/parse-community/parse-server/commit/40eb442e02672986730007d0a1edb22c1c4bd357
cvssv4 8.7 https://github.com/parse-community/parse-server/commit/fbac847499e57f243315c5fc7135be1d58bb8e54
generic_textual HIGH https://github.com/parse-community/parse-server/commit/fbac847499e57f243315c5fc7135be1d58bb8e54
ssvc Track https://github.com/parse-community/parse-server/commit/fbac847499e57f243315c5fc7135be1d58bb8e54
cvssv4 8.7 https://github.com/parse-community/parse-server/pull/10270
generic_textual HIGH https://github.com/parse-community/parse-server/pull/10270
ssvc Track https://github.com/parse-community/parse-server/pull/10270
cvssv4 8.7 https://github.com/parse-community/parse-server/pull/10271
generic_textual HIGH https://github.com/parse-community/parse-server/pull/10271
ssvc Track https://github.com/parse-community/parse-server/pull/10271
cvssv3.1_qr HIGH https://github.com/parse-community/parse-server/security/advisories/GHSA-g4cf-xj29-wqqr
cvssv4 8.7 https://github.com/parse-community/parse-server/security/advisories/GHSA-g4cf-xj29-wqqr
generic_textual HIGH https://github.com/parse-community/parse-server/security/advisories/GHSA-g4cf-xj29-wqqr
ssvc Track https://github.com/parse-community/parse-server/security/advisories/GHSA-g4cf-xj29-wqqr
cvssv4 8.7 https://nvd.nist.gov/vuln/detail/CVE-2026-33538
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2026-33538
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-33538
https://github.com/parse-community/parse-server
https://github.com/parse-community/parse-server/commit/40eb442e02672986730007d0a1edb22c1c4bd357
https://github.com/parse-community/parse-server/commit/fbac847499e57f243315c5fc7135be1d58bb8e54
https://github.com/parse-community/parse-server/pull/10270
https://github.com/parse-community/parse-server/pull/10271
https://github.com/parse-community/parse-server/security/advisories/GHSA-g4cf-xj29-wqqr
https://nvd.nist.gov/vuln/detail/CVE-2026-33538
GHSA-g4cf-xj29-wqqr https://github.com/advisories/GHSA-g4cf-xj29-wqqr
No exploits are available.
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N Found at https://github.com/parse-community/parse-server/commit/40eb442e02672986730007d0a1edb22c1c4bd357
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:Y/T:P/P:M/B:A/M:M/D:T/2026-03-24T18:37:14Z/ Found at https://github.com/parse-community/parse-server/commit/40eb442e02672986730007d0a1edb22c1c4bd357
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N Found at https://github.com/parse-community/parse-server/commit/fbac847499e57f243315c5fc7135be1d58bb8e54
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:Y/T:P/P:M/B:A/M:M/D:T/2026-03-24T18:37:14Z/ Found at https://github.com/parse-community/parse-server/commit/fbac847499e57f243315c5fc7135be1d58bb8e54
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N Found at https://github.com/parse-community/parse-server/pull/10270
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:Y/T:P/P:M/B:A/M:M/D:T/2026-03-24T18:37:14Z/ Found at https://github.com/parse-community/parse-server/pull/10270
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N Found at https://github.com/parse-community/parse-server/pull/10271
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:Y/T:P/P:M/B:A/M:M/D:T/2026-03-24T18:37:14Z/ Found at https://github.com/parse-community/parse-server/pull/10271
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N Found at https://github.com/parse-community/parse-server/security/advisories/GHSA-g4cf-xj29-wqqr
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:Y/T:P/P:M/B:A/M:M/D:T/2026-03-24T18:37:14Z/ Found at https://github.com/parse-community/parse-server/security/advisories/GHSA-g4cf-xj29-wqqr
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N Found at https://nvd.nist.gov/vuln/detail/CVE-2026-33538
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 0.34147
EPSS Score 0.00142
Published At June 5, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-04T16:58:21.234899+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-g4cf-xj29-wqqr/GHSA-g4cf-xj29-wqqr.json 38.6.0