Parse Server: Cloud function validator bypass via prototype chain traversal
Priority MEDIUM 41CWE-863Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- Present
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-863.
Summary
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.67 and 9.7.0-alpha.11, an attacker can bypass Cloud Function validator access controls by appending "prototype.constructor" to the function name in the URL. When a Cloud Function handler is declared using the function keyword and its validator is a plain object or arrow function, the trigger store traversal resolves the handler through its own prototype chain while the validator store fails to mirror this traversal, causing all access control enforcement to be skipped. This allows unauthenticated callers to invoke Cloud Functions that are meant to be protected by validators such as requireUser, requireMaster, or custom validation logic. This issue has been patched in versions 8.6.67 and 9.7.0-alpha.11.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00282 20th percentileScored 2026-11-07
Fix Fixed parse-server (parse-community): 8.6.67, 9.7.0-alpha.11parse-server (npm): 9.7.0-alpha.11, 8.6.67
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| parse-community | parse-server | before 8.6.67; 9.0.0 to before 9.7.0-alpha.11 | 8.6.67, 9.7.0-alpha.11 | Patch available | CNA |
| — | parse-server (npm) | 9.0.0 to before 9.7.0-alpha.11 | 9.7.0-alpha.11 | Patch available | GHSA-vpj2-qq7w-5qq6 |
| — | parse-server (npm) | before 8.6.67 | 8.6.67 | Patch available | GHSA-vpj2-qq7w-5qq6 |
- parse-server Vendorparse-community Affected before 8.6.67; 9.0.0 to before 9.7.0-alpha.11 Fixed in 8.6.67, 9.7.0-alpha.11 Patch available CNA
- parse-server (npm) Vendor— Affected 9.0.0 to before 9.7.0-alpha.11 Fixed in 9.7.0-alpha.11 Patch available GHSA-vpj2-qq7w-5qq6
- parse-server (npm) Vendor— Affected before 8.6.67 Fixed in 8.6.67 Patch available GHSA-vpj2-qq7w-5qq6
CPE configurations NVD · 11
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:* | before 8.6.67; 9.0.0 to before 9.7.0 | Vulnerable | parse-community |
| cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha1:*:*:*:node.js:*:* | 9.7.0 alpha1 | Vulnerable | parse-community |
| cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha10:*:*:*:node.js:*:* | 9.7.0 alpha10 | Vulnerable | parse-community |
| cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha2:*:*:*:node.js:*:* | 9.7.0 alpha2 | Vulnerable | parse-community |
| cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha3:*:*:*:node.js:*:* | 9.7.0 alpha3 | Vulnerable | parse-community |
| cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha4:*:*:*:node.js:*:* | 9.7.0 alpha4 | Vulnerable | parse-community |
| cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha5:*:*:*:node.js:*:* | 9.7.0 alpha5 | Vulnerable | parse-community |
| cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha6:*:*:*:node.js:*:* | 9.7.0 alpha6 | Vulnerable | parse-community |
| cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha7:*:*:*:node.js:*:* | 9.7.0 alpha7 | Vulnerable | parse-community |
| cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha8:*:*:*:node.js:*:* | 9.7.0 alpha8 | Vulnerable | parse-community |
- cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:* Versions before 8.6.67; 9.0.0 to before 9.7.0 Vulnerable ·parse-community
- cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha1:*:*:*:node.js:*:* Versions 9.7.0 alpha1 Vulnerable ·parse-community
- cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha10:*:*:*:node.js:*:* Versions 9.7.0 alpha10 Vulnerable ·parse-community
- cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha2:*:*:*:node.js:*:* Versions 9.7.0 alpha2 Vulnerable ·parse-community
- cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha3:*:*:*:node.js:*:* Versions 9.7.0 alpha3 Vulnerable ·parse-community
- cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha4:*:*:*:node.js:*:* Versions 9.7.0 alpha4 Vulnerable ·parse-community
- cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha5:*:*:*:node.js:*:* Versions 9.7.0 alpha5 Vulnerable ·parse-community
- cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha6:*:*:*:node.js:*:* Versions 9.7.0 alpha6 Vulnerable ·parse-community
- cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha7:*:*:*:node.js:*:* Versions 9.7.0 alpha7 Vulnerable ·parse-community
- cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha8:*:*:*:node.js:*:* Versions 9.7.0 alpha8 Vulnerable ·parse-community
Show 1 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha9:*:*:*:node.js:*:* | 9.7.0 alpha9 | Vulnerable | parse-community |
- cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha9:*:*:*:node.js:*:* Versions 9.7.0 alpha9 Vulnerable ·parse-community
Remediation
- Fix · CNA parse-server (parse-community) Fixed in 8.6.67, 9.7.0-alpha.11
- Fix · GHSA-vpj2-qq7w-5qq6 parse-server (npm) Fixed in 9.7.0-alpha.11 Advisory →
- Fix · GHSA-vpj2-qq7w-5qq6 parse-server (npm) Fixed in 8.6.67 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-34532
- 2026-10-03 Alias added: GHSA-vpj2-qq7w-5qq6
References
Patch 5
- https://github.com/parse-community/parse-server/security/advisories/GHSA-vpj2-qq7w-5qq6
- https://github.com/parse-community/parse-server/pull/10342
- https://github.com/parse-community/parse-server/pull/10343
- https://github.com/parse-community/parse-server/commit/4fc48cf28f22eea200d74d883505f485234a48d7
- https://github.com/parse-community/parse-server/commit/dc59e272665644083c5b7f6862d88ce1ef0b2674
More parse-community Parse-server vulnerabilities
- TI-2022-08574 Command Injection in Parse server CVSS 3.1CRITICAL 10.0
- TI-2024-18136 Parse Server literalizeRegexPart SQL Injection CVSS 3.1CRITICAL 10.0
- TI-2022-18768 Parse Server vulnerable to Remote Code Execution via prototype pollution in MongoDB BSON parser CVSS 3.1CRITICAL 9.8
- TI-2024-31550 Parse Server's custom object ID allows to acquire role privileges CVSS 3.1HIGH 8.1
- TI-2023-18316 Parse Server vulnerable to remote code execution via MongoDB BSON parser through prototype pollution CVSS 3.1CRITICAL 9.8
- TI-2026-23790 Parse Server session token exfiltration via `redirectClassNameForKey` query parameter CVSS 4.0CRITICAL 9.9
Sources
- CVE-2026-34532 · CVE Program
- CVE-2026-34532 · NVD
- FIRST EPSS
- GHSA-vpj2-qq7w-5qq6 · GitHub Advisory Database · CC BY 4.0
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