PatchTheCVECVE-2026-84003: Authentication bypass by capture-replay in Microsoft Authentication Library (MSAL) for Node.js allows an unaut
CVE-2026-84003 is a high-severity flaw (CVSS 7.4) affecting azure\/msal-node. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Authentication bypass by capture-replay in Microsoft Authentication Library (MSAL) for Node.js allows an unauthorized attacker to perform spoofing over a network.
Why this priority
- High severity
- Remotely exploitable, no login, no user action
- On your watchlist
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.4 (High) |
| Attack vector | Network (remote) |
| Attack complexity | High |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.6% (top 52%) |
| CISA exploited list | No |
| Weakness | CWE-294 |
| Published | 2026-09-08 |
| Last modified | 2026-09-16 |
Last updated 2026-09-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-84003?
azure\/msal-node: upgrade to 5.6.0. Exact commands for each OS are on this page.
Is CVE-2026-84003 being exploited?
CVE-2026-84003 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-84003 affect?
CVE-2026-84003 affects azure\/msal-node. Severity is high (CVSS 7.4). Authentication bypass by capture-replay in Microsoft Authentication Library (MSAL) for Node.js allows an unauthorized attacker to perform spoofing over a network.
How urgent is CVE-2026-84003?
Priority 48/100. High severity; Remotely exploitable, no login, no user action; On your watchlist
Software pages
Node.js vulnerabilities · Azure vulnerabilities