CVE-2026-33429
published 2026-03-24CVE-2026-33429: Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.54 and 9.6.0-alpha.43, an…
PriorityP429medium5.3CVSS 3.1
AVNACLPRNUINSUCLINAN
EPSS
0.32%
23.3th percentile
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.54 and 9.6.0-alpha.43, an attacker can subscribe to LiveQuery with a watch parameter targeting a protected field. Although the protected field value is properly stripped from event payloads, the presence or absence of update events reveals whether the protected field changed, creating a binary oracle. For boolean protected fields, the timing of change events is equivalent to knowing the field value. This issue has been patched in versions 8.6.54 and 9.6.0-alpha.43.
Affected
7 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| parse-community | parse-server | < 8.6.54 | 8.6.54 |
| parse-community | parse-server | — | — |
| parse-community | parse-server | >= 0 < 8.6.54 | 8.6.54 |
| parse-community | parse-server | >= 9.0.0 < 9.6.0-alpha.43 | 9.6.0-alpha.43 |
| parseplatform | parse-server | < 8.6.54 | 8.6.54 |
| parseplatform | parse-server | — | — |
| parseplatform | parse-server | >= 9.0.0 < 9.6.0 | 9.6.0 |
CVSS provenance
nvdv3.15.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
nvdv4.06.3MEDIUMCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/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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GHSA
Parse Server has a protected field change detection oracle via LiveQuery watch parameter
ghsa·2026-03-20
CVE-2026-33429 [MEDIUM] CWE-203 Parse Server has a protected field change detection oracle via LiveQuery watch parameter
Parse Server has a protected field change detection oracle via LiveQuery watch parameter
### Impact
An attacker can subscribe to LiveQuery with a `watch` parameter targeting a protected field. Although the protected field value is properly stripped from event payloads, the presence or absence of update events reveals whether the protected field changed, creating a binary oracle. For boolean protected fields, the timing of change events is equivalent to knowing the field value.
### Patches
The `watch` parameter is now validated against protected fields at subscription time, mirroring the existing validation for the `where` clause. Subscriptions that include protected fields in `watch` are rejected with a permission error. Master key connections are exempt.
### Workarounds
None.
OSV
Parse Server has a protected field change detection oracle via LiveQuery watch parameter
osv·2026-03-20
CVE-2026-33429 [MEDIUM] Parse Server has a protected field change detection oracle via LiveQuery watch parameter
Parse Server has a protected field change detection oracle via LiveQuery watch parameter
### Impact
An attacker can subscribe to LiveQuery with a `watch` parameter targeting a protected field. Although the protected field value is properly stripped from event payloads, the presence or absence of update events reveals whether the protected field changed, creating a binary oracle. For boolean protected fields, the timing of change events is equivalent to knowing the field value.
### Patches
The `watch` parameter is now validated against protected fields at subscription time, mirroring the existing validation for the `where` clause. Subscriptions that include protected fields in `watch` are rejected with a permission error. Master key connections are exempt.
### Workarounds
None.
No detection rules found.
No public exploits indexed.
https://github.com/parse-community/parse-server/commit/0c0a0a5a37ca821d2553119f2cb3be35322eda4bhttps://github.com/parse-community/parse-server/commit/c62eacaf38de86913f09240583448360b1cc8e67https://github.com/parse-community/parse-server/pull/10253https://github.com/parse-community/parse-server/pull/10254https://github.com/parse-community/parse-server/security/advisories/GHSA-qpc3-fg4j-8hgm
2026-03-24
Published