Cyber Resilience

CVE-2026-33429

Parseplatform Parse-Server ≤ 8.6.54

Published
24 March 2026
Modified
25 March 2026
Patch / advisory
View advisory
CVSS Score v4 6.3
Click a component to see what it means
Raw vectorCVSS: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
EPSS Score 0.0032 24th percentile
Risk Priority 35 floored blend · peak EPSS

Summary

CVE-2026-33429 is a medium-severity Observable Discrepancy (CWE-203) vulnerability in Parseplatform Parse-Server. Its CVSS base score is 6.3 (Medium).

Operationally, ranked at the 24th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to AC-4 (Information Flow Enforcement) and AC-3 (Access Enforcement) — see the control section below for these in your framework.

EU & UK References

Vulnerability Data

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…

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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.

CWE(s)
CWE-203

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

Insufficient information to map techniques.
Confidence: LOW · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2026-32234Same product: Parseplatform Parse-Server
CVE-2024-29027Same product: Parseplatform Parse-Server
CVE-2026-30946Same product: Parseplatform Parse-Server
CVE-2026-27804Same product: Parseplatform Parse-Server
CVE-2026-33409Same product: Parseplatform Parse-Server
CVE-2024-47183Same product: Parseplatform Parse-Server
CVE-2026-33539Same product: Parseplatform Parse-Server
CVE-2026-30966Same product: Parseplatform Parse-Server
CVE-2026-34532Same product: Parseplatform Parse-Server
CVE-2026-34363Same product: Parseplatform Parse-Server

Affected Assets

parseplatform
parse-server
9.6.0 · ≤ 8.6.54 · 9.0.0 — 9.6.0

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)
  • AC-4 Information Flow Enforcement
  • AC-3 Access Enforcement
Detect
Catch it (NIST detect / respond)
  • SI-4 System Monitoring
Harden
Shrink the surface (DISA STIG)
  • 1 hardening rule · 1 OS baseline
Validate
Prove the fix (OWASP ASVS)

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Mitigating Controls (NIST 800-53 r5) AI

AC-4 Information Flow Enforcement good match
prevent

Directly blocks the unauthorized information flow that occurs when LiveQuery event presence/absence leaks protected-field state to an unauthorized subscriber.

AC-3 Access Enforcement partial match
prevent

Enforces access-control decisions on LiveQuery watch parameters so that protected fields cannot be observed even indirectly.

SI-4 System Monitoring partial match
detect

Enables monitoring and alerting on LiveQuery subscriptions that target fields marked as protected, surfacing the attempted oracle attack.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly prevent observable response discrepancies via consistent error handling and timing.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.17 Clock synchronization none match
none

Accurate, synchronized timestamps reduce observable timing discrepancies that an attacker could exploit to infer sensitive information or distinguish between success and failure paths.

References