CVE-2026-1181Network attack vector

Workspace data access via permissive credentialed CORS

Published Jan 19, 2026 · Updated Jan 19, 2026

Permissive CORS in Altium 365 allows context-dependent attackers to access authenticated workspace APIs from trusted subdomains. Workspace endpoints accept credentialed cross-origin requests from less-trusted Altium subdomains because allowed origins include forum.live.altium.com. Exploitation requires JavaScript on an allowed origin and a logged-in victim; resulting access includes workspace data, administrative actions, and IP-allowlist bypass.

CVSS severity9.0
Critical
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Permissive CORS in Altium 365 allows context-dependent attackers to access authenticated workspace APIs from trusted subdomains. Workspace endpoints accept credentialed cross-origin requests from less-trusted Altium subdomains because allowed origins include forum.live.altium.com. Exploitation requires JavaScript on an allowed origin and a logged-in victim; resulting access includes workspace data, administrative actions, and IP-allowlist bypass.

The record

CVE
CVE-2026-1181
Published
Jan 19, 2026
Updated
Jan 19, 2026
Vendor
Altium
Product
Altium 365
Classifications
CWE-942, CWE-284, CAPEC-17, CAPEC-122, CAPEC-233, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 19, 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=0 <=4.4.5 changes=[{"at":"4.4.6","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Altium · Altium 365version=0 <=4.4.5 changes=[{"at":"4.4.6","status":"unaffected"}]

Published CVSS scores

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

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-942Permissive Cross-domain Policy with Untrusted Domains
CWE-284Improper Access Control
CAPEC-17Accessing, Modifying, or Executing Executable Files
CAPEC-122Privilege Abuse
CAPEC-233Privilege Escalation via Trust Boundary Violation
T1190Exploit Public-Facing Application

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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