CVE-2026-33538: 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-2026-33538?

parse-server: upgrade to 8.6.58, 9.6.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-33538 being exploited?

CVE-2026-33538 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-2026-33538 affect?

CVE-2026-33538 affects parse-server. Severity is high (CVSS 7.5). Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.58 and 9.6.0-alpha.52, an unauthenticated attacker can cause denial of service by sending authentication requests

Q: How urgent is CVE-2026-33538?

Priority 40/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2026-33538 is a high-severity flaw (CVSS 7.5) 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 8.6.58 and 9.6.0-alpha.52, an unauthenticated attacker can cause denial of service by sending authentication requests with arbitrary, unconfigured provider names. The server executes a database query for each unconfigured provider before rejecting the request, and since no database index exists for unconfigured providers, each

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 64%)
CISA exploited list	No
Weakness	CWE-400
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: < 8.6.58 · >= 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: 8.6.58, 9.6.0

Safe to downgrade to: a release before 9.0.0

1. Check installed version

npm ls parse-server

2. UPGRADE to 8.6.58

npm install parse-server@">=8.6.58"

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-2026-33538?

parse-server: upgrade to 8.6.58, 9.6.0. Exact commands for each OS are on this page.

Is CVE-2026-33538 being exploited?

CVE-2026-33538 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-2026-33538 affect?

CVE-2026-33538 affects parse-server. Severity is high (CVSS 7.5). Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.58 and 9.6.0-alpha.52, an unauthenticated attacker can cause denial of service by sending authentication requests

How urgent is CVE-2026-33538?

Priority 40/100. High severity; Remotely exploitable, no login, no user action

Software pages

Node.js vulnerabilities

Related CVEs

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CVE-2021-47986 HIGH 7.5 DOWNGRADE Parse Server before 4.10.0 contains a supply chain vulnerability where incorrect version tags were pushed to t
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
CVE-2026-39381 MEDIUM 4.3 UPGRADE Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js

References

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