Parse Server: Malformed `$regex` query leaks database error details in API response
Priority LOW 37CWE-209Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-209.
Summary
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.7 and 9.5.0-alpha.6, malformed $regex query parameter (e.g. [abc) causes the database to return a structured error object that is passed unsanitized through the API response. This leaks database internals such as error messages, error codes, code names, cluster timestamps, and topology details. The vulnerability is exploitable by any client that can send query requests, depending on the deployment's permission configuration. This issue has been patched in versions 8.6.7 and 9.5.0-alpha.6.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0037 31st percentileScored 2026-11-07
Fix Fixed parse-server (parse-community): 8.6.7, 9.5.0-alpha.6parse-server (npm): 9.5.0-alpha.6, 8.6.7
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
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 8.6.7; before 9.5.0-alpha.6 | 8.6.7, 9.5.0-alpha.6 | Patch available | CNA |
| — | parse-server (npm) | 9.0.0 to before 9.5.0-alpha.6 | 9.5.0-alpha.6 | Patch available | GHSA-9cp7-3q5w-j92g |
| — | parse-server (npm) | before 8.6.7 | 8.6.7 | Patch available | GHSA-9cp7-3q5w-j92g |
- parse-server Vendorparse-community Affected before 8.6.7; before 9.5.0-alpha.6 Fixed in 8.6.7, 9.5.0-alpha.6 Patch available CNA
- parse-server (npm) Vendor— Affected 9.0.0 to before 9.5.0-alpha.6 Fixed in 9.5.0-alpha.6 Patch available GHSA-9cp7-3q5w-j92g
- parse-server (npm) Vendor— Affected before 8.6.7 Fixed in 8.6.7 Patch available GHSA-9cp7-3q5w-j92g
CPE configurations NVD · 6
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:* | before 8.6.7; 9.0.0 to before 9.5.0 | Vulnerable | parse-community |
| cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha1:*:*:*:node.js:*:* | 9.5.0 alpha1 | Vulnerable | parse-community |
| cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha2:*:*:*:node.js:*:* | 9.5.0 alpha2 | Vulnerable | parse-community |
| cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha3:*:*:*:node.js:*:* | 9.5.0 alpha3 | Vulnerable | parse-community |
| cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha4:*:*:*:node.js:*:* | 9.5.0 alpha4 | Vulnerable | parse-community |
| cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha5:*:*:*:node.js:*:* | 9.5.0 alpha5 | Vulnerable | parse-community |
- cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:* Versions before 8.6.7; 9.0.0 to before 9.5.0 Vulnerable ·parse-community
- cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha1:*:*:*:node.js:*:* Versions 9.5.0 alpha1 Vulnerable ·parse-community
- cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha2:*:*:*:node.js:*:* Versions 9.5.0 alpha2 Vulnerable ·parse-community
- cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha3:*:*:*:node.js:*:* Versions 9.5.0 alpha3 Vulnerable ·parse-community
- cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha4:*:*:*:node.js:*:* Versions 9.5.0 alpha4 Vulnerable ·parse-community
- cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha5:*:*:*:node.js:*:* Versions 9.5.0 alpha5 Vulnerable ·parse-community
Remediation
- Fix · CNA parse-server (parse-community) Fixed in 8.6.7, 9.5.0-alpha.6
- Fix · GHSA-9cp7-3q5w-j92g parse-server (npm) Fixed in 9.5.0-alpha.6 Advisory →
- Fix · GHSA-9cp7-3q5w-j92g parse-server (npm) Fixed in 8.6.7 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-30835
- 2026-10-03 Alias added: GHSA-9cp7-3q5w-j92g
References
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-2026-30835 · CVE Program
- CVE-2026-30835 · NVD
- FIRST EPSS
- GHSA-9cp7-3q5w-j92g · GitHub Advisory Database · CC BY 4.0
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