Builder.io Gen2 SDKs through 5.2.11 Prototype Pollution via builder.userAttributes
Priority MEDIUM 57CWE-1321Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Passive
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- Low · Low · Low
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA.
Summary
Builder.io Gen2 SDKs through versions 5.2.11 and 0.25.13 contain a prototype pollution vulnerability in the unflatten helper that processes builder.userAttributes query parameters without prototype guards. Attackers can craft preview links with __proto__ or prototype segments to pollute Object.prototype in a visitor's browser when the SDK processes the malicious URL.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00359 29th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- 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 |
|---|---|---|---|---|---|
| QwikDev | @builder.io/sdk-react | up to 5.2.11 | — | No fix listed | CNA |
| QwikDev | @builder.io/sdk-vue | up to 5.2.11 | — | No fix listed | CNA |
| QwikDev | @builder.io/sdk-svelte | up to 5.2.11 | — | No fix listed | CNA |
| QwikDev | @builder.io/sdk-solid | up to 5.2.11 | — | No fix listed | CNA |
| QwikDev | @builder.io/sdk-qwik | up to 0.25.13 | — | No fix listed | CNA |
| QwikDev | @builder.io/sdk-angular | up to 0.25.13 | — | No fix listed | CNA |
| QwikDev | @builder.io/sdk-react-nextjs | up to 0.25.13 | — | No fix listed | CNA |
- @builder.io/sdk-react VendorQwikDev Affected up to 5.2.11 Fixed in — No fix listed CNA
- @builder.io/sdk-vue VendorQwikDev Affected up to 5.2.11 Fixed in — No fix listed CNA
- @builder.io/sdk-svelte VendorQwikDev Affected up to 5.2.11 Fixed in — No fix listed CNA
- @builder.io/sdk-solid VendorQwikDev Affected up to 5.2.11 Fixed in — No fix listed CNA
- @builder.io/sdk-qwik VendorQwikDev Affected up to 0.25.13 Fixed in — No fix listed CNA
- @builder.io/sdk-angular VendorQwikDev Affected up to 0.25.13 Fixed in — No fix listed CNA
- @builder.io/sdk-react-nextjs VendorQwikDev Affected up to 0.25.13 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2026-92781
- 2026-10-03 Alias added: GHSA-mgr8-fxxv-82mj
- 2026-11-06 Affected versions changed · Red Hat
- 2026-11-06 CVSS score added · Red Hat
References
More QwikDev vulnerabilities
- TI-2023-01211 Code Injection in builderio/qwik CVSS 3.1CRITICAL 10.0
- TI-2026-56751 gpt-crawler Arbitrary File Write via outputFileName Parameter CVSS 4.0HIGH 8.8
- TI-2025-33547 Crashing any Qwik Server CVSS 4.0CRITICAL 9.2
- TI-2023-02164 Cross-Site Request Forgery (CSRF) in builderio/qwik CVSS 3.1MEDIUM 6.5
- TI-2024-27738 Cross-site Scripting (XSS) vulnerability due to improper HTML escaping in qwik CVSS 3.1MEDIUM 6.3
- TI-2023-00388 Cross-site Scripting (XSS) - Generic in builderio/qwik CVSS 3.1MEDIUM 6.1
Sources
- CVE-2026-92781 · CVE Program
- CVE-2026-92781 · NVD
- FIRST EPSS
- GHSA-mgr8-fxxv-82mj · GitHub Advisory Database · CC BY 4.0
- CVE-2026-92781 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences