CVE-2026-33429
MEDIUM
GHSA-qpc3-fg4j-8hgm
CVSS 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/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
Lifecycle Timeline
3Description
### 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.
Analysis
An information disclosure vulnerability in Parse Server's LiveQuery functionality allows attackers to infer the values of protected fields by monitoring whether update events are generated when those fields change, effectively creating a binary oracle that reveals field modifications despite the field values themselves being stripped from event payloads. The vulnerability affects Parse Server npm package across multiple versions, and while no public exploit code or active exploitation has been documented, the attack requires only standard subscription capabilities without elevated privileges. …
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Vendor patch is available.
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External POC / Exploit Code
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