# CVE-2026-34363: Parse Server: LiveQuery protected field leak via shared mutable state across concurrent subscribers

> Concurrent LiveQuery subscribers may leak protected fields or authentication data due to shared mutable state in event handlers.

- **Severity:** High 8.2 (`CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 31 Mar 2026
- **Updated:** 31 Mar 2026
- **Also known as:** BIT-parse-2026-34363, GHSA-m983-v2ff-wq65

## What is CVE-2026-34363?

CVE-2026-34363 is a high-severity vulnerability in Parseplatform Parse-Server, published on 31 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-362 (Concurrent Execution using Shared Resource with Improper Synchronization)

## Which versions are affected by CVE-2026-34363?

5 open source packages ship an affected version, including parse-server and parse. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `parse-server` | npm | All versions | 8.6.65 |
| `parse-server` | npm | All versions | 8.6.65 |
| `parse-server` | npm | From 9.0.0 | 9.7.0-alpha.9 |
| `parse-server` | npm | From 9.0.0 | 9.7.0-alpha.9 |
| `parse` | Bitnami | All versions | 8.6.65, 9.7.0 |

Products: Parseplatform Parse-Server.

## How do I fix CVE-2026-34363?

Upgrade parse-server to a fixed version for your release line: 8.6.65 or 9.7.0-alpha.9.

## Is CVE-2026-34363 being exploited?

There is no known exploitation of CVE-2026-34363 in the wild and no public exploit code.

## Other vulnerabilities in Parseplatform Parse-Server

- [CVE-2026-30966](https://insights.sbomify.com/CVE-2026-30966/): Parse Server role escalation and CLP bypass via direct `_Join` table write (critical 10.0)
- [CVE-2024-27298](https://insights.sbomify.com/CVE-2024-27298/): Parse Server literalizeRegexPart SQL Injection (critical 10.0)
- [CVE-2022-24760](https://insights.sbomify.com/CVE-2022-24760/): Command Injection in Parse server (critical 10.0)
- [CVE-2026-30965](https://insights.sbomify.com/CVE-2026-30965/): Parse Server session token exfiltration via `redirectClassNameForKey` query parameter (critical 9.9)
- [CVE-2023-36475](https://insights.sbomify.com/CVE-2023-36475/): Parse Server vulnerable to remote code execution via MongoDB BSON parser through prototype pollution (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-34363 and fix it if it is affected.

What it is: CVE-2026-34363 is a high-severity vulnerability in Parseplatform Parse-Server, published on 31 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-34363 in the wild and no public exploit code.

Affected packages and fixed versions:
- parse-server (npm): affected all versions; fixed in 8.6.65
- parse-server (npm): affected all versions; fixed in 8.6.65
- parse-server (npm): affected from 9.0.0; fixed in 9.7.0-alpha.9
- parse-server (npm): affected from 9.0.0; fixed in 9.7.0-alpha.9
- parse (Bitnami): affected all versions; fixed in 8.6.65, 9.7.0

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-34363/ (Markdown: https://insights.sbomify.com/CVE-2026-34363/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-34363
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-34363
- OSV: https://osv.dev/vulnerability/CVE-2026-34363

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-34363/
Summaries are generated and may contain mistakes; the official description above is the record.