How severe is CVE-2026-33331?

CVE-2026-33331 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity low, and availability none.

Is CVE-2026-33331 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33331?

CVE-2026-33331 affects Orpc. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-33331?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-33331 have an EU (EUVD) identifier?

Yes. CVE-2026-33331 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20085.

When was CVE-2026-33331 published?

CVE-2026-33331 was published on 2026-03-24 and last updated on 2026-06-17.

CVE-2026-33331

CVE-2026-33331 is a high-severity vulnerability in Orpc with a CVSS 3.x base score of 8.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: High (CVSS 3.x base score 8.2)
EPSS exploit prediction: 0% (21st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-20085
Weakness: CWE-79
Affected product: Orpc
Published: 2026-03-24
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-33331?: 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.
How severe is CVE-2026-33331?: CVE-2026-33331 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity low, and availability none.
Is CVE-2026-33331 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33331?: CVE-2026-33331 affects Orpc. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-33331?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-33331 have an EU (EUVD) identifier?: Yes. CVE-2026-33331 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20085.
When was CVE-2026-33331 published?: CVE-2026-33331 was published on 2026-03-24 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:orpc:orpc:*:*:*:*:*:*:*:*

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