High severity · published Jun 25, 2026
CVE-2021-47986
Parse Server - Unreviewed Code Execution via Malicious Version Tags
7.5
CVSS
0.2%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
High
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 7% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PA
parse-server · parse-community
before 4.10.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-47986
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-47986
Vendor Advisory
https://github.com/parse-community/parse-server/security/advisories/GHSA-593v-wcqx-hq2w
Third Party Advisory
https://www.vulncheck.com/advisories/parse-server-unreviewed-code-execution-via-malicious-version-tags
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