Vulnerability · Published Mar 31, 2026 · Assigned by GitHub_M
CVE-2026-34595Parse Server: LiveQuery protected-field guard bypass via array-like logical operator value
Medium 5.3
In plain English
A medium-severity type confusion in parse-server from parse-community. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.70 and 9.7.0-alpha.18, 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. This issue has been patched in versions 8.6.70 and 9.7.0-alpha.18.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | parse-server | 9.7.0-alpha.16 | GHSA-mmg8-87c5-jrc2 |
| npm | parse-server | 8.6.70 | GHSA-mmg8-87c5-jrc2 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| parse-community | parse-server | < 8.6.70>= 9.0.0, < 9.7.0-alpha.18 |
Weakness: CWE-843 · 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
References
- https://github.com/parse-community/parse-server/security/advisories/GHSA-mmg8-87c5-jrc2 x_refsource_CONFIRM
- https://github.com/parse-community/parse-server/pull/10350 x_refsource_MISC
- https://github.com/parse-community/parse-server/pull/10351 x_refsource_MISC
- https://github.com/parse-community/parse-server/commit/f63fd1a3fe0a7c1c5fe809f01b0e04759e8c9b98 x_refsource_MISC
- https://github.com/parse-community/parse-server/commit/ffad0ec6b971ee0dd9545e1bf1fb34ddebf275c2 x_refsource_MISC