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CVE-2026-33331

HighPublished

oRPC: Stored XSS in OpenAPI Reference Plugin via unescaped JSON.stringify

Published: Mar 24, 2026
Updated: Mar 25, 2026
Assigning CNA: GitHub_M
Evidence observed: Aug 25, 2026

Primary CVSS

8.2/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

EPSS probability estimate

0.3%

Low · next 30 days

Percentile: 21.5%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

oRPC is an tool that helps build APIs that are end-to-end type-safe and adhere to OpenAPI standards. Prior to version 1.13.9, a stored cross-site scripting (XSS) vulnerability exists in the OpenAPI documentation generation of orpc. If an attacker can control any field within the OpenAPI specification (such as info.description), they can break out of the JSON context and execute arbitrary JavaScript when a user views the generated API documentation. This issue has been patched in version 1.13.9.

Sources

CVE-2026-33331PoC
Local lab reproducing stored XSS in oRPC's OpenAPI docs generation (CVE-2026-33331), with vulnerable and patched versions for comparison and a standalone PoC.

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