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CVE-2026-43930

Parse Server: MFA SMS one-time password accepted twice under concurrent login

Published: May 12, 2026Updated: May 26, 2026 Sources: CVE List NVDCWE-362
NVD MITRE
5.9CVSSMEDIUM
EPSS Score
0.2%
Top 85.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 8.6.76 and 9.9.0-alpha.2, a race condition in the MFA SMS one-time password (OTP) login path allows two concurrent /login requests carrying the same OTP to both succeed and both receive valid session tokens, breaking the single-use property of the OTP. The vulnerability requires the attacker to already possess the victim's password and intercept the active SMS OTP (e.g. via SIM swap, network mirror, or phishing relay) and to race the legitimate login request, so the practical attack surface is narrow. This vulnerability is fixed in 8.6.76 and 9.9.0-alpha.2.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:NI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-362

Affected Products

parse-serverparse-community
LibraryLibrary
OSS Libraries / npm
parse-serverparseplatform
LibraryLibrary
OSS Libraries / generic-library
parse-communityoss-projectOSS Librariesaka parse, parse server, parse-server
parseplatformoss-projectOSS Librariesaka parse platform

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available
Workaround Available

MITRE ATT&CK

1 technique
Privilege Escalation
View detailed technique mapping

References

https://github.com/parse-community/parse-server/security/advisories/GHSA-jpq4-7fmq-q5fj
github.com
https://github.com/parse-community/parse-server/pull/10448
github.com
https://github.com/parse-community/parse-server/pull/10449
github.com

Timeline

Published
May 12, 2026
Last Updated
May 26, 2026

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