CVE-2026-33331 HIGH

CVE-2026-33331: oRPC: Stored XSS in OpenAPI Reference Plugin via unescaped JSON.stringify

Vendor Middleapi
Product orpc
Weakness CWE-79 · XSS
Published March 24, 2026
Last update March 25, 2026

CVSS base score

8.2/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality High
Integrity Low

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 24, 2026 CVE published
March 25, 2026 Record updated