CVE-2026-1009 (GCVE-0-2026-1009)

Vulnerability from cvelistv5 – Published: 2026-01-15 22:51 – Updated: 2026-01-16 22:41
VLAI?
Title
Stored Cross-Site Scripting in Altium Forum Leading to Cross-Customer Data Exposure
Summary
A stored cross-site scripting (XSS) vulnerability exists in the Altium Forum due to missing server-side input sanitization in forum post content. An authenticated attacker can inject arbitrary JavaScript into forum posts, which is stored and executed when other users view the affected post. Successful exploitation allows the attacker’s payload to execute in the context of the victim’s authenticated Altium 365 session, enabling unauthorized access to workspace data, including design files and workspace settings. Exploitation requires user interaction to view a malicious forum post.
Severity ?
9 (Critical)
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
CWE
  • CWE-79 - Improper Neutralization of Input During Web Page Generation (Cross-site Scripting)
  • CWE-284 - Improper Access Control
Assigner
References
Impacted products
Vendor Product Version
Altium Altium Forum (Altium 365) Affected: 0 , ≤ 4.4.5 (semver)
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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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