CVE-2026-1009Network attack vector

Workspace data exposure via stored forum JavaScript

Published Jan 15, 2026 · Updated Jan 15, 2026

Stored XSS in Altium Live 1.2.2 and earlier allows remote authenticated users to access workspace data through crafted forum posts. Forum post editing and rendering stores arbitrary JavaScript because server-side sanitization is missing, then executes it for post viewers. Exploitation requires a user to view the post and runs in the victim's authenticated Altium 365 session, exposing design files and workspace settings.

CVSS severity9.0
Critical
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Altium Live 1.2.2 and earlier allows remote authenticated users to access workspace data through crafted forum posts. Forum post editing and rendering stores arbitrary JavaScript because server-side sanitization is missing, then executes it for post viewers. Exploitation requires a user to view the post and runs in the victim's authenticated Altium 365 session, exposing design files and workspace settings.

The record

CVE
CVE-2026-1009
Published
Jan 15, 2026
Updated
Jan 15, 2026
Vendor
Altium
Product
Altium Live
Classifications
CWE-79, CWE-284, CAPEC-122, CAPEC-63, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Altium · Altium Liveversion=unspecified

Published CVSS scores

9.0AltiumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-284Improper Access Control
CAPEC-122Privilege Abuse
CAPEC-63Cross-Site Scripting
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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