Vulnerability · CVE-2026-109461
Microsoft Authentication Library (MSAL) for Node.js Information Disclosure Vulnerability
Published Oct 15, 2026 · catalog updated Oct 18, 2026 · Microsoft
Check if you run it
No confirmed exploitation is on record for CVE-2026-109461. EPSS is 0.35%. Act only if a listed version of Microsoft is installed.
Gaps on this record
- No version range is stored. A customer cannot check an installed version against this record.
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- Medium5.9
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.35%
- Remediation
- Advisory link
- Affected products
- Microsoft
Origin validation error in Microsoft Authentication Library (MSAL) for Node.js allows an unauthorized attacker to disclose information over a network.
No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.
How to fix CVE-2026-109461
Recommended remediation
A patch or advisory reference is linked. Open the original publisher for availability by product version.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-109461. EPSS is 0.35%. Act only if a listed version of Microsoft is installed.
Which versions are affected?
Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-346. EPSS 0.35%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Oct 15, 2026 · CSAF Advisories
Detected
Microsoft
Oct 18, 2026 · NIST NVD
Updated
Origin validation error in Microsoft Authentication Library (MSAL) for Node.js allows an unauthorized attacker to disclose information over a network.
Sources
- CSAF AdvisoriesVendor advisorymsrc_CVE-2026-109461:CVE-2026-109461
Microsoft
msrc.microsoft.com - CVE.orgVulnerability recordCVE-2026-109461
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-109461
30-day exploitation probability 0.3%
first.org - NIST NVDVulnerability recordCVE-2026-109461
Origin validation error in Microsoft Authentication Library (MSAL) for Node.js allows an unauthorized attacker to disclose information over a network.
nvd.nist.gov - Tenable CVE DatabaseVulnerability recordCVE-2026-109461
Origin validation error in Microsoft Authentication Library (MSAL) for Node.js allows an unauthorized attacker to disclose information over a network.
tenable.com
References
Freshness
Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.