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Vulnerability record · CVE-2026-33331 · published 24 March 2026

CVE-2026-33331: Orpc cross-site scripting vulnerability

Orpc · Orpc

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.

5.4 CVSS 3.1 Medium EPSS 0.34% · top 74.9% CWE-79 · Cross-site scripting
5.4CVSS 3.1 base score
0.34%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/middleapi/orpc/commit/4f0efa8a1d3fa8e8317a4b03cc3945a5dfd68add Patch
https://github.com/middleapi/orpc/releases/tag/v1.13.9 ProductRelease Notes
https://github.com/middleapi/orpc/security/advisories/GHSA-7f6v-3gx7-27q8 ExploitMitigationVendor Advisory
https://github.com/middleapi/orpc/security/advisories/GHSA-7f6v-3gx7-27q8 ExploitMitigationVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-33331), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.