CVE-2021-47986: Parse Server before 4.10.0 contains a supply chain vulnerability where incorrect version tags were pushed to t

Q: How do I fix CVE-2021-47986?

parse-server: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2021-47986 being exploited?

CVE-2021-47986 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-2021-47986 affect?

CVE-2021-47986 affects parse-server. Severity is high (CVSS 7.5). Parse Server before 4.10.0 contains a supply chain vulnerability where incorrect version tags were pushed to the repository linking to unreviewed code in a personal fork. Attackers could exploit this by specifying affected version tags in d

Routine

HIGH 7.5DOWNGRADE

CVE-2021-47986 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 before 4.10.0 contains a supply chain vulnerability where incorrect version tags were pushed to the repository linking to unreviewed code in a personal fork. Attackers could exploit this by specifying affected version tags in dependency declarations to execute unreviewed and potentially malicious code.

Why this priority

High severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 93%)
CISA exploited list	No
Weakness	CWE-494
Published	2026-06-25
Last modified	2026-07-30

Publisher (CNA): VulnCheck · Vendor: parseplatform

Last updated 2026-07-30 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-25 22:16 UTCPublished CVE record published
2026-07-30 14:32 UTCUpdated Record last modified

parseplatform parse-server DOWNGRADE

Affected: 4.0.0 beta1 · 4.0.0 beta2 · 4.0.0 beta3 · 4.0.0 beta4 · 4.0.0 beta5 · 4.0.0 beta6 · 4.0.3 · 4.0.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.0.0

1. Check installed version

npm ls parse-server

2. No fixed release: DOWNGRADE to a release before 4.0.0

npm view parse-server versions npm install parse-server@"<4.0.0"

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-2021-47986?

parse-server: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-47986 being exploited?

CVE-2021-47986 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-2021-47986 affect?

CVE-2021-47986 affects parse-server. Severity is high (CVSS 7.5). Parse Server before 4.10.0 contains a supply chain vulnerability where incorrect version tags were pushed to the repository linking to unreviewed code in a personal fork. Attackers could exploit this by specifying affected version tags in d

How urgent is CVE-2021-47986?

Priority 28/100. High severity

Related CVEs

CVE-2026-39321 LOW 3.7 UPGRADE Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js
CVE-2026-43930 MEDIUM 5.9 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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