CVE-2026-34363
Parse Server: LiveQuery protected field leak via shared mutable state across concurrent subscribers
Description
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.65 and 9.7.0-alpha.9, when multiple clients subscribe to the same class via LiveQuery, the event handlers process each subscriber concurrently using shared mutable objects. The sensitive data filter modifies these shared objects in-place, so when one subscriber's filter removes a protected field, subsequent subscribers may receive the already-filtered object. This can cause protected fields and authentication data to leak to clients that should not see them, or cause clients that should see the data to receive an incomplete object. Additionally, when an afterEvent Cloud Code trigger is registered, one subscriber's trigger modifications can leak to other subscribers through the same shared mutable state. Any Parse Server deployment using LiveQuery with protected fields or afterEvent triggers is affected when multiple clients subscribe to the same class. This issue has been patched in versions 8.6.65 and 9.7.0-alpha.9.
INFO
Published Date :
March 31, 2026, 3:16 p.m.
Last Modified :
July 24, 2026, 9:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update Parse Server to version 8.6.65 or later.
- Update Parse Server to version 9.7.0-alpha.9 or later.
- Review and secure LiveQuery event handler logic.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-34363.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-34363 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-34363
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-34363 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-34363 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Jul. 24, 2026
Action Type Old Value New Value Added Translation Title: parse-server de parse-community, Description: Parse Server es un backend de código abierto que puede ser desplegado en cualquier infraestructura que pueda ejecutar Node.js. Antes de las versiones 8.6.65 y 9.7.0-alpha.9, cuando múltiples clientes se suscriben a la misma clase a través de LiveQuery, los manejadores de eventos procesan a cada suscriptor concurrentemente utilizando objetos mutables compartidos. El filtro de datos sensibles modifica estos objetos compartidos in situ, así, cuando el filtro de un suscriptor elimina un campo protegido, los suscriptores posteriores pueden recibir el objeto ya filtrado. Esto puede causar que campos protegidos y datos de autenticación se filtren a clientes que no deberían verlos, o causar que los clientes que sí deberían ver los datos reciban un objeto incompleto. Además, cuando se registra un disparador afterEvent de Cloud Code, las modificaciones del disparador de un suscriptor pueden filtrarse a otros suscriptores a través del mismo estado mutable compartido. Cualquier despliegue de Parse Server que utilice LiveQuery con campos protegidos o disparadores afterEvent se ve afectado cuando múltiples clientes se suscriben a la misma clase. Este problema ha sido parcheado en las versiones 8.6.65 y 9.7.0-alpha.9. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'parse-community', 'product': 'parse-server', 'versions': [{'status': 'affected', 'version': '< 8.6.65'}, {'status': 'affected', 'version': '>= 9.0.0, < 9.7.0-alpha.9'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-34363', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-03-31T18:50:22.038438Z'} -
Initial Analysis by [email protected]
Apr. 02, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N Added CPE Configuration OR *cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:* versions from (including) 9.0.0 up to (excluding) 9.7.0 *cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha1:*:*:*:node.js:*:* *cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha2:*:*:*:node.js:*:* *cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha3:*:*:*:node.js:*:* *cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha4:*:*:*:node.js:*:* *cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha5:*:*:*:node.js:*:* *cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha6:*:*:*:node.js:*:* *cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha7:*:*:*:node.js:*:* *cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha8:*:*:*:node.js:*:* *cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:* versions up to (excluding) 8.6.65 Added Reference Type GitHub, Inc.: https://github.com/parse-community/parse-server/commit/5834e29234593addaa0251a85f572ad4f376320b Types: Patch Added Reference Type GitHub, Inc.: https://github.com/parse-community/parse-server/commit/776c71c3078e77d38c94937f463741793609d055 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/parse-community/parse-server/pull/10330 Types: Issue Tracking, Patch Added Reference Type GitHub, Inc.: https://github.com/parse-community/parse-server/pull/10331 Types: Issue Tracking, Patch Added Reference Type GitHub, Inc.: https://github.com/parse-community/parse-server/security/advisories/GHSA-m983-v2ff-wq65 Types: Patch, Vendor Advisory -
New CVE Received by [email protected]
Mar. 31, 2026
Action Type Old Value New Value Added Description Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.65 and 9.7.0-alpha.9, when multiple clients subscribe to the same class via LiveQuery, the event handlers process each subscriber concurrently using shared mutable objects. The sensitive data filter modifies these shared objects in-place, so when one subscriber's filter removes a protected field, subsequent subscribers may receive the already-filtered object. This can cause protected fields and authentication data to leak to clients that should not see them, or cause clients that should see the data to receive an incomplete object. Additionally, when an afterEvent Cloud Code trigger is registered, one subscriber's trigger modifications can leak to other subscribers through the same shared mutable state. Any Parse Server deployment using LiveQuery with protected fields or afterEvent triggers is affected when multiple clients subscribe to the same class. This issue has been patched in versions 8.6.65 and 9.7.0-alpha.9. Added CVSS V4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/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 Added CWE CWE-362 Added Reference https://github.com/parse-community/parse-server/commit/5834e29234593addaa0251a85f572ad4f376320b Added Reference https://github.com/parse-community/parse-server/commit/776c71c3078e77d38c94937f463741793609d055 Added Reference https://github.com/parse-community/parse-server/pull/10330 Added Reference https://github.com/parse-community/parse-server/pull/10331 Added Reference https://github.com/parse-community/parse-server/security/advisories/GHSA-m983-v2ff-wq65