CVE-2026-33421: Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js

Q: How do I fix CVE-2026-33421?

parse-server: upgrade to 8.6.53, 9.6.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-33421 being exploited?

CVE-2026-33421 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-33421 affect?

CVE-2026-33421 affects parse-server. Severity is medium (CVSS 6.5). Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.53 and 9.6.0-alpha.42, Parse Server's LiveQuery WebSocket interface does not enforce Class-Level Permission (CLP)

Q: How urgent is CVE-2026-33421?

Priority 32/100. No elevated risk signals yet.

Routine

MEDIUM 6.5UPGRADE

CVE-2026-33421 is a medium-severity flaw (CVSS 6.5) affecting parse-server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.53 and 9.6.0-alpha.42, Parse Server's LiveQuery WebSocket interface does not enforce Class-Level Permission (CLP) pointer permissions (readUserFields and pointerFields). Any authenticated user can subscribe to LiveQuery events and receive real-time updates for all objects in classes protected by pointer permissions, regard

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 65%)
CISA exploited list	No
Weakness	CWE-863
Published	2026-03-24
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: parseplatform

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-24 19:16 UTCPublished CVE record published
2026-06-17 10:37 UTCUpdated Record last modified

parseplatform parse-server UPGRADE

Affected: < 8.6.53 · >= 9.0.0 and < 9.6.0 · 9.6.0 alpha1 · 9.6.0 alpha10 · 9.6.0 alpha11 · 9.6.0 alpha12 · 9.6.0 alpha13 · 9.6.0 alpha14

Fixed in: 8.6.53, 9.6.0

Safe to downgrade to: a release before 9.0.0

1. Check installed version

npm ls parse-server

2. UPGRADE to 8.6.53

npm install parse-server@">=8.6.53"

3. If no update is available yet, DOWNGRADE to a release before 9.0.0

npm view parse-server versions npm install parse-server@"<9.0.0"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-33421?

parse-server: upgrade to 8.6.53, 9.6.0. Exact commands for each OS are on this page.

Is CVE-2026-33421 being exploited?

CVE-2026-33421 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-33421 affect?

CVE-2026-33421 affects parse-server. Severity is medium (CVSS 6.5). Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.53 and 9.6.0-alpha.42, Parse Server's LiveQuery WebSocket interface does not enforce Class-Level Permission (CLP)

How urgent is CVE-2026-33421?

Priority 32/100. No elevated risk signals yet.

Software pages

Node.js vulnerabilities

Related CVEs

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CVE-2026-35200 MEDIUM 5.4 UPGRADE Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js
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References

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