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Vulnerability details: VCID-nqnd-8hx6-5bh4
Vulnerability ID VCID-nqnd-8hx6-5bh4
Aliases CVE-2026-31901
GHSA-w54v-hf9p-8856
Summary Parse Server vulnerable to user enumeration via email verification endpoint The email verification endpoint (`/verificationEmailRequest`) returns distinct error responses depending on whether an email address belongs to an existing user, is already verified, or does not exist. An attacker can send requests with different email addresses and observe the error codes to determine which email addresses are registered in the application. This is a user enumeration vulnerability that affects any Parse Server deployment with email verification enabled (`verifyUserEmails: true`).
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-204 Observable Response Discrepancy
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 0.00044 https://api.first.org/data/v1/epss?cve=CVE-2026-31901
epss 0.00044 https://api.first.org/data/v1/epss?cve=CVE-2026-31901
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-w54v-hf9p-8856
cvssv4 6.3 https://github.com/parse-community/parse-server
generic_textual MODERATE https://github.com/parse-community/parse-server
cvssv4 6.3 https://github.com/parse-community/parse-server/releases/tag/8.6.34
generic_textual MODERATE https://github.com/parse-community/parse-server/releases/tag/8.6.34
ssvc Track https://github.com/parse-community/parse-server/releases/tag/8.6.34
cvssv4 6.3 https://github.com/parse-community/parse-server/releases/tag/9.6.0-alpha.8
generic_textual MODERATE https://github.com/parse-community/parse-server/releases/tag/9.6.0-alpha.8
ssvc Track https://github.com/parse-community/parse-server/releases/tag/9.6.0-alpha.8
cvssv3.1_qr MODERATE https://github.com/parse-community/parse-server/security/advisories/GHSA-w54v-hf9p-8856
cvssv4 6.3 https://github.com/parse-community/parse-server/security/advisories/GHSA-w54v-hf9p-8856
generic_textual MODERATE https://github.com/parse-community/parse-server/security/advisories/GHSA-w54v-hf9p-8856
ssvc Track https://github.com/parse-community/parse-server/security/advisories/GHSA-w54v-hf9p-8856
cvssv4 6.3 https://nvd.nist.gov/vuln/detail/CVE-2026-31901
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2026-31901
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-31901
https://github.com/parse-community/parse-server
https://github.com/parse-community/parse-server/releases/tag/8.6.34
https://github.com/parse-community/parse-server/releases/tag/9.6.0-alpha.8
CVE-2026-31901 https://nvd.nist.gov/vuln/detail/CVE-2026-31901
GHSA-w54v-hf9p-8856 https://github.com/advisories/GHSA-w54v-hf9p-8856
GHSA-w54v-hf9p-8856 https://github.com/parse-community/parse-server/security/advisories/GHSA-w54v-hf9p-8856
No exploits are available.
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/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:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N Found at https://github.com/parse-community/parse-server/releases/tag/8.6.34
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

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-12T20:01:34Z/ Found at https://github.com/parse-community/parse-server/releases/tag/8.6.34
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N Found at https://github.com/parse-community/parse-server/releases/tag/9.6.0-alpha.8
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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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-12T20:01:34Z/ Found at https://github.com/parse-community/parse-server/releases/tag/9.6.0-alpha.8
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N Found at https://github.com/parse-community/parse-server/security/advisories/GHSA-w54v-hf9p-8856
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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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-12T20:01:34Z/ Found at https://github.com/parse-community/parse-server/security/advisories/GHSA-w54v-hf9p-8856
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N Found at https://nvd.nist.gov/vuln/detail/CVE-2026-31901
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

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none

passive

active

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Exploit Prediction Scoring System (EPSS)
Percentile 0.1408
EPSS Score 0.00044
Published At June 5, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-02T04:51:40.344651+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/npm/parse-server/CVE-2026-31901.yml 38.6.0