CVE-2026-108469: Microsoft Authentication Library for JavaScript Spoofing Vulnerability
CVE-2026-108469 is a spoofing vulnerability in Microsoft Authentication Library for JavaScript, rated Important by Microsoft, with a CVSS 3.1 base score of 6.8 (Medium). An attacker can exploit it remotely over the network, without any privileges and only if a user takes an action. Microsoft has not reported exploitation in the wild and rates exploitation as less likely. Microsoft released the fix on 10 November 2026 in the November 2026 Patch Tuesday. It affects 1 product in 1 product family (Azure).
Key facts
- CVE ID
- CVE-2026-108469
- Severity
- Medium CVSS 6.8
- Microsoft severity
- Important
- Impact
- Spoofing
- Exploited in the wild
- No
- Publicly disclosed
- No
- Exploitation likelihood
- Less Likely
- Weakness
- CWE-79
- CISA KEV
- Not listed
- Released
- Last updated
- Patch Tuesday
- November 2026 Patch Tuesday
- Product families
- Azure
CVSS score and vector
Microsoft scores CVE-2026-108469 at 6.8 (temporal 5.9) using CVSS 3.1. Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C
| Metric | Value |
|---|---|
| Attack vector | Network |
| Attack complexity | High |
| Privileges required | None |
| User interaction | Required |
| Scope | Unchanged |
| Confidentiality impact | High |
| Integrity impact | High |
| Availability impact | None |
| Exploit code maturity | Unproven |
| Remediation level | Official fix |
| Report confidence | Confirmed |
Description
Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Authentication Library for JavaScript allows an unauthorized attacker to perform spoofing over a network.
Frequently asked questions (Microsoft)
According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?
Successful exploitation requires an application to have enabled the optional popup relay feature and deployed its relay page without a Content Security Policy that blocks the attack. The attacker cannot configure these settings on the victim application.
Affected products (1)
Azure
| Product | Security update | Type | Fixed build | Restart |
|---|---|---|---|---|
| Microsoft Authentication Library for JavaScript | Release Notes | Security Update | 5.21.0 | No |
NIST NVD data
- NVD status
- Awaiting Analysis
- NVD CVSS
- 6.8 (MEDIUM)
- NVD weakness
- CWE-79
- Published to NVD
- NVD last modified
References
Acknowledgments
- Thinnawarth Mathuros (benzdeus)
Revision history
| Version | Date | Description |
|---|---|---|
| 1.0 | Information published. |