Parse Server session token exfiltration via `redirectClassNameForKey` query parameter
Priority MEDIUM 52CWE-863Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- 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 9.5.2-alpha.8 and 8.6.21, a vulnerability in Parse Server's query handling allows an authenticated or unauthenticated attacker to exfiltrate session tokens of other users by exploiting the redirectClassNameForKey query parameter. Exfiltrated session tokens can be used to take over user accounts. The vulnerability requires the attacker to be able to create or update an object with a new relation field, which depends on the Class-Level Permissions of at least one class. This vulnerability is fixed in 9.5.2-alpha.8 and 8.6.21.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01452 73rd percentileScored 2026-11-07
Fix Fixed parse-server (parse-community): 8.6.21parse-server (npm): 9.5.2-alpha.8, 8.6.21
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- 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 | >= 9.0.0 < 9.5.2-alpha.8; before 8.6.21 | 8.6.21 | Patch available | CNA |
| — | parse-server (npm) | 9.0.0-alpha.1 to before 9.5.2-alpha.8 | 9.5.2-alpha.8 | Patch available | GHSA-6r2j-cxgf-495f |
| — | parse-server (npm) | before 8.6.21 | 8.6.21 | Patch available | GHSA-6r2j-cxgf-495f |
- parse-server Vendorparse-community Affected >= 9.0.0 < 9.5.2-alpha.8; before 8.6.21 Fixed in 8.6.21 Patch available CNA
- parse-server (npm) Vendor— Affected 9.0.0-alpha.1 to before 9.5.2-alpha.8 Fixed in 9.5.2-alpha.8 Patch available GHSA-6r2j-cxgf-495f
- parse-server (npm) Vendor— Affected before 8.6.21 Fixed in 8.6.21 Patch available GHSA-6r2j-cxgf-495f
CPE configurations NVD · 8
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:* | before 8.6.21; 9.0.0 to before 9.5.2 | Vulnerable | parse-community |
| cpe:2.3:a:parseplatform:parse-server:9.5.2:alpha1:*:*:*:node.js:*:* | 9.5.2 alpha1 | Vulnerable | parse-community |
| cpe:2.3:a:parseplatform:parse-server:9.5.2:alpha2:*:*:*:node.js:*:* | 9.5.2 alpha2 | Vulnerable | parse-community |
| cpe:2.3:a:parseplatform:parse-server:9.5.2:alpha3:*:*:*:node.js:*:* | 9.5.2 alpha3 | Vulnerable | parse-community |
| cpe:2.3:a:parseplatform:parse-server:9.5.2:alpha4:*:*:*:node.js:*:* | 9.5.2 alpha4 | Vulnerable | parse-community |
| cpe:2.3:a:parseplatform:parse-server:9.5.2:alpha5:*:*:*:node.js:*:* | 9.5.2 alpha5 | Vulnerable | parse-community |
| cpe:2.3:a:parseplatform:parse-server:9.5.2:alpha6:*:*:*:node.js:*:* | 9.5.2 alpha6 | Vulnerable | parse-community |
| cpe:2.3:a:parseplatform:parse-server:9.5.2:alpha7:*:*:*:node.js:*:* | 9.5.2 alpha7 | Vulnerable | parse-community |
- cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:* Versions before 8.6.21; 9.0.0 to before 9.5.2 Vulnerable ·parse-community
- cpe:2.3:a:parseplatform:parse-server:9.5.2:alpha1:*:*:*:node.js:*:* Versions 9.5.2 alpha1 Vulnerable ·parse-community
- cpe:2.3:a:parseplatform:parse-server:9.5.2:alpha2:*:*:*:node.js:*:* Versions 9.5.2 alpha2 Vulnerable ·parse-community
- cpe:2.3:a:parseplatform:parse-server:9.5.2:alpha3:*:*:*:node.js:*:* Versions 9.5.2 alpha3 Vulnerable ·parse-community
- cpe:2.3:a:parseplatform:parse-server:9.5.2:alpha4:*:*:*:node.js:*:* Versions 9.5.2 alpha4 Vulnerable ·parse-community
- cpe:2.3:a:parseplatform:parse-server:9.5.2:alpha5:*:*:*:node.js:*:* Versions 9.5.2 alpha5 Vulnerable ·parse-community
- cpe:2.3:a:parseplatform:parse-server:9.5.2:alpha6:*:*:*:node.js:*:* Versions 9.5.2 alpha6 Vulnerable ·parse-community
- cpe:2.3:a:parseplatform:parse-server:9.5.2:alpha7:*:*:*:node.js:*:* Versions 9.5.2 alpha7 Vulnerable ·parse-community
Remediation
- Fix · CNA parse-server (parse-community) Fixed in 8.6.21
- Fix · GHSA-6r2j-cxgf-495f parse-server (npm) Fixed in 9.5.2-alpha.8 Advisory →
- Fix · GHSA-6r2j-cxgf-495f parse-server (npm) Fixed in 8.6.21 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-30965
- 2026-10-03 Alias added: GHSA-6r2j-cxgf-495f
References
Advisory 2
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-2026-24777 Parse Server: Account takeover via operator injection in authentication data identifier CVSS 4.0CRITICAL 9.3
Sources
- CVE-2026-30965 · CVE Program
- CVE-2026-30965 · NVD
- FIRST EPSS
- GHSA-6r2j-cxgf-495f · GitHub Advisory Database · CC BY 4.0
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