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CVE-2026-1010

HighPublished

Stored Cross-Site Scripting in Altium Enterprise Server Workflow Engine Allows Privilege Escalation

Published: Jan 15, 2026
Updated: Feb 5, 2026
Assigning CNA: Altium
Evidence observed: Aug 10, 2026

Primary CVSS

8.0/ 10High

nvd · CVSS 3.1

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

EPSS probability estimate

0.3%

Low · next 30 days

Percentile: 27.8%
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

A stored cross-site scripting (XSS) vulnerability exists in the Altium Workflow Engine due to missing server-side input sanitization in workflow form submission APIs. A regular authenticated user can inject arbitrary JavaScript into workflow data. When an administrator views the affected workflow, the injected payload executes in the administrator’s browser context, allowing privilege escalation, including creation of new administrator accounts, session token theft, and execution of administrative actions.

Sources

CVE-2026-1010-WebSocket-Connection-Smuggling-via-Malformed-Upgrade-HeaderPoC
Proof-of-concept exploit for CVE-2026-1010, demonstrating WebSocket connection smuggling and request splitting through a malformed Upgrade header against reverse proxy/backend setups.

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