CVE-2026-33624
published 2026-03-24CVE-2026-33624: Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.60 and 9.6.0-alpha.54, an…
PriorityP411low2.7CVSS 3.1
AVNACLPRHUINSUCNILAN
EPSS
0.18%
7.2th percentile
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.60 and 9.6.0-alpha.54, 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. This issue has been patched in versions 8.6.60 and 9.6.0-alpha.54.
Affected
7 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| parse-community | parse-server | < 8.6.60 | 8.6.60 |
| parse-community | parse-server | — | — |
| parse-community | parse-server | >= 0 < 8.6.60 | 8.6.60 |
| parse-community | parse-server | >= 9.0.0 < 9.6.0-alpha.54 | 9.6.0-alpha.54 |
| parseplatform | parse-server | < 8.6.60 | 8.6.60 |
| parseplatform | parse-server | — | — |
| parseplatform | parse-server | >= 9.0.0 < 9.6.0 | 9.6.0 |
CVSS provenance
nvdv3.12.7LOWCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N
nvdv4.02.1LOWCVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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OSV
Parse Server: MFA recovery code single-use bypass via concurrent requests
osv·2026-03-24
CVE-2026-33624 [LOW] Parse Server: MFA recovery code single-use bypass via concurrent requests
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.
GHSA
Parse Server: MFA recovery code single-use bypass via concurrent requests
ghsa·2026-03-24
CVE-2026-33624 [LOW] CWE-367 Parse Server: MFA recovery code single-use bypass via concurrent requests
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.
No detection rules found.
No public exploits indexed.
https://github.com/parse-community/parse-server/commit/5e70094250a36bfcc14ecd49592be2b94fba66ffhttps://github.com/parse-community/parse-server/commit/fc3da35a81d5083b453e8967cabcc880f1a3bd0chttps://github.com/parse-community/parse-server/pull/10275https://github.com/parse-community/parse-server/pull/10276https://github.com/parse-community/parse-server/security/advisories/GHSA-2299-ghjr-6vjp
2026-03-24
Published