Parse Server has a LiveQuery protected-field guard bypass via array-like logical operator value
Impact
An authenticated user with find class-level permission can bypass the protectedFields class-level permission setting on LiveQuery subscriptions. By sending a subscription with a $or, $and, or $nor operator value as a plain object with numeric keys and a length property (an "array-like" object) instead of an array, the protected-field guard is bypassed. The subscription event firing acts as a binary oracle, allowing the attacker to infer whether a protected field matches a given test value.
Patches
The fix validates that $or, $and, and $nor operator values are arrays in the LiveQuery subscription handler, the query depth checker, and the protected-field guard. As defense in depth, the LiveQuery query evaluator also rejects non-array values for these operators.
Workarounds
There is no known workaround.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | parse-server | >= 9.0.0, < 9.7.0-alpha.16, < 8.6.70 | 9.7.0-alpha.16, 8.6.70 |
References
- https://github.com/parse-community/parse-server/security/advisories/GHSA-mmg8-87c5-jrc2
- https://nvd.nist.gov/vuln/detail/CVE-2026-34595
- https://github.com/parse-community/parse-server/pull/10350
- https://github.com/parse-community/parse-server/pull/10351
- https://github.com/parse-community/parse-server/commit/f63fd1a3fe0a7c1c5fe809f01b0e04759e8c9b98
- https://github.com/parse-community/parse-server/commit/ffad0ec6b971ee0dd9545e1bf1fb34ddebf275c2
- https://github.com/parse-community/parse-server
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N- Weakness (CWE)
CWE-843- Platform
- npm
- Package
parse-server- Disclosed
- 01.04.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-mmg8-87c5-jrc2 - CC BY 4.0
Vulnerability history: parse-server
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 116
- First → latest
- 06.2019 06.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 17
- High 49
- Medium 40
- Low 10
Disclosures per year
- 2019: 2
- 2020: 4
- 2021: 4
- 2022: 12
- 2023: 5
- 2024: 4
- 2025: 6
- 2026: 79
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Parse Server has a LiveQuery protected-field guard bypass via array-like logical operator value this entry
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