Cyber Resilience

CVE-2026-39381

Access Control in Parseplatform Parse-Server ≤ 8.6.75

Access Control
Published
07 April 2026
Modified
24 July 2026
Patch / advisory
View advisory
CVSS Score v4 5.3
Click a component to see what it means
Raw vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:L/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 0.0019 9th percentile
Risk Priority 35 floored blend · peak EPSS

Summary

CVE-2026-39381 is a medium-severity Incorrect Authorization (CWE-863) vulnerability in Parseplatform Parse-Server. Its CVSS base score is 5.3 (Medium).

Operationally, ranked at the 9th 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-3 (Access Enforcement) and AC-4 (Information Flow Enforcement) — see the control section below for these in your framework.

OWASP Top 10 for Web (2025)

A01:2025 Broken Access Control

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 9.8.0-alpha.7 and 8.6.75, the GET /sessions/me endpoint returns _Session fields that the server operator explicitly configured as protected via the…

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protectedFields server option. Any authenticated user can retrieve their own session's protected fields with a single request. The equivalent GET /sessions and GET /sessions/:objectId endpoints correctly strip protected fields. This vulnerability is fixed in 9.8.0-alpha.7 and 8.6.75.

CWE(s)
CWE-863

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-2026-30228Same product: Parseplatform Parse-Server
CVE-2026-29182Same product: Parseplatform Parse-Server
CVE-2026-30947Same product: Parseplatform Parse-Server
CVE-2026-34532Same product: Parseplatform Parse-Server
CVE-2026-30965Same product: Parseplatform Parse-Server
CVE-2026-33421Same product: Parseplatform Parse-Server
CVE-2026-30854Same product: Parseplatform Parse-Server
CVE-2026-33527Same product: Parseplatform Parse-Server
CVE-2026-30229Same product: Parseplatform Parse-Server
CVE-2026-30863Same product: Parseplatform Parse-Server

Affected Assets

parseplatform
parse-server
9.8.0 · ≤ 8.6.75 · 9.0.0 — 9.8.0

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)
  • AC-3 Access Enforcement
  • AC-4 Information Flow Enforcement
  • AC-6 Least Privilege
Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)
  • 5 hardening rules · 3 OS baselines
Validate
Prove the fix (OWASP ASVS)

—

Mitigating Controls (NIST 800-53 r5) AI

AC-3 Access Enforcement good match
prevent

Directly enforces access restrictions on protected _Session fields so they are not returned by any endpoint to unauthorized callers.

AC-4 Information Flow Enforcement good match
prevent

Enforces information-flow rules that strip protected fields from responses regardless of the specific session-retrieval path used.

AC-6 Least Privilege partial match
prevent

Limits the data elements an authenticated user is permitted to obtain, preventing exposure of fields the operator marked protected.

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.AA-05 mostly match
prevents

Defining, enforcing, and reviewing access authorizations and least privilege directly prevents incorrect authorization checks.

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.5.15 Access control partial match
prevents

Requiring consistency between access rights and classification plus formal approval steps ensures that the authorization logic correctly distinguishes between entities that should and should not be granted access.

A.5.18 Access rights partial match
prevents

Enforcing policy-driven approval and role-change reviews stops incorrect or stale authorization decisions from remaining in effect after job changes or terminations.

A.8.3 Information access restriction partial match
prevents

By tying access rights to identity, device, location and classification, the control reduces the likelihood that an authorization decision will be based on an incorrect or bypassed policy.

References