CVE-2026-1181

CRITICALNVD 9.09.0—
EchelonGraph scoreMEDIUM confidence

Score 9.0 from GitHub Security Advisory (severity: CRITICAL) published 2026-01-19. NVD baseline CVSS 9.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.0
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.0Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Altium 365 workspace endpoints were configured with an overly permissive Cross-Origin Resource Sharing (CORS) policy that allowed credentialed cross-origin requests from other Altium-controlled subdomains, including forum.live.altium.com. As a result, JavaScript executing on those origins could access authenticated workspace APIs in the context of a logged-in user. When chained with vulnerabilities in those external applications, this misconfiguration enables unauthorized access to workspace data, administrative actions, and bypass of IP allowlisting controls, including in GovCloud environments.

CVSS v3
9.0
EG Score
9.0(medium)
EG Risk
41(Track)
EG Risk 41/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity90% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
22.9%
KEV
Not listed

Published

January 19, 2026

Last Modified

April 15, 2026

Advisory Details (1)

Auto-updated May 21, 2026
No patch confirmed yet.
generic

Security Advisories | Altium

https://www.altium.com/platform/security-compliance/security-advisories

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 35× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-23 03:04 UTCEG score recompute
  2. 2026-07-22 14:08 UTCEPSS rescore
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  67. 2026-05-21 00:39 UTCEG score recompute
  68. 2026-05-21 00:39 UTCGHSA enrichment
  69. 2026-05-20 22:38 UTCEPSS rescore
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  75. 2026-05-18 21:31 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-1181?
CVE-2026-1181 is a critical vulnerability published on January 19, 2026. Altium 365 workspace endpoints were configured with an overly permissive Cross-Origin Resource Sharing (CORS) policy that allowed credentialed cross-origin requests from other Altium-controlled subdomains, including forum.live.altium.com. As a result, JavaScript executing on those origins could…
When was CVE-2026-1181 disclosed?
CVE-2026-1181 was first published in the National Vulnerability Database on January 19, 2026, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-1181 actively exploited?
CVE-2026-1181 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 22.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-1181?
CVE-2026-1181 has a CVSS v3 base score of 9.0 (NVD).
How do I remediate CVE-2026-1181?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-1181, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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