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CVE-2026-33331

Orpc cross-site scripting (XSS)

8.2 HIGHPublic exploitEPSS 0.34%
  1. Published24 Mar 2026

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 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeChanged
ConfidentialityHigh
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

Affected products

Orpc< 1.13.9

Remediation

Fixed in
Orpc≥ 1.13.9

References

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Frequently asked

Is CVE-2026-33331 being actively exploited?

CVE-2026-33331 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.34%.

How severe is CVE-2026-33331?

CVE-2026-33331 has a CVSS 3.1 base score of 8.2, rated high. EPSS estimates a 0.34% probability of exploitation.

Which products are affected by CVE-2026-33331?

Affected products include Orpc.

How do I fix CVE-2026-33331?

Upgrade affected software to a fixed version, for example Orpc 1.13.9 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-33331 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.