CVE-2026-33409
published 2026-03-24CVE-2026-33409: Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.52 and 9.6.0-alpha.41, an…
PriorityP267critical9.1CVSS 3.1
AVNACLPRNUINSUCHIHAN
EPSS
0.46%
36.2th percentile
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.52 and 9.6.0-alpha.41, an authentication bypass vulnerability allows an attacker to log in as any user who has linked a third-party authentication provider, without knowing the user's credentials. The attacker only needs to know the user's provider ID to gain full access to their account, including a valid session token. This affects Parse Server deployments where the server option allowExpiredAuthDataToken is set to true. The default value is false. This issue has been patched in versions 8.6.52 and 9.6.0-alpha.41.
Affected
7 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| parse-community | parse-server | < 8.6.52 | 8.6.52 |
| parse-community | parse-server | — | — |
| parse-community | parse-server | >= 0 < 8.6.52 | 8.6.52 |
| parse-community | parse-server | >= 9.0.0 < 9.6.0-alpha.41 | 9.6.0-alpha.41 |
| parseplatform | parse-server | < 8.6.52 | 8.6.52 |
| parseplatform | parse-server | — | — |
| parseplatform | parse-server | >= 9.0.0 < 9.6.0 | 9.6.0 |
CVSS provenance
nvdv3.19.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
nvdv4.07.0HIGHCVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:A/VC:H/VI:H/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 has an auth provider validation bypass on login via partial authData
osv·2026-03-19
CVE-2026-33409 [HIGH] Parse Server has an auth provider validation bypass on login via partial authData
Parse Server has an auth provider validation bypass on login via partial authData
### Impact
An authentication bypass vulnerability allows an attacker to log in as any user who has linked a third-party authentication provider, without knowing the user's credentials. The attacker only needs to know the user's provider ID to gain full access to their account, including a valid session token.
This affects Parse Server deployments where the server option `allowExpiredAuthDataToken` is set to `true`. The default value is `false`.
### Patches
Auth providers are now always validated on login, regardless of the `allowExpiredAuthDataToken` setting. The option `allowExpiredAuthDataToken` has been deprecated and will be removed in a future major version.
### Workarounds
Set `allowExpiredAuthDa
GHSA
Parse Server has an auth provider validation bypass on login via partial authData
ghsa·2026-03-19
CVE-2026-33409 [HIGH] CWE-287 Parse Server has an auth provider validation bypass on login via partial authData
Parse Server has an auth provider validation bypass on login via partial authData
### Impact
An authentication bypass vulnerability allows an attacker to log in as any user who has linked a third-party authentication provider, without knowing the user's credentials. The attacker only needs to know the user's provider ID to gain full access to their account, including a valid session token.
This affects Parse Server deployments where the server option `allowExpiredAuthDataToken` is set to `true`. The default value is `false`.
### Patches
Auth providers are now always validated on login, regardless of the `allowExpiredAuthDataToken` setting. The option `allowExpiredAuthDataToken` has been deprecated and will be removed in a future major version.
### Workarounds
Set `allowExpiredAuthDa
No detection rules found.
No public exploits indexed.
https://github.com/parse-community/parse-server/commit/8d7df5639c4a35768fe8b78b4580b30e8a74721chttps://github.com/parse-community/parse-server/commit/98f4ba5bcf2c199bfe6225f672e8edcd08ba732dhttps://github.com/parse-community/parse-server/pull/10246https://github.com/parse-community/parse-server/pull/10247https://github.com/parse-community/parse-server/security/advisories/GHSA-pfj7-wv7c-22pr
2026-03-24
Published