EUVD-2026-73922
GHSA-gmqm-6r28-m87v
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Network interception required for token capture justifies AC:H; no auth or user interaction needed; spoofing grants full victim-identity access (C:H/I:H), no availability impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Authentication bypass by capture-replay in Microsoft Authentication Library (MSAL) for Node.js allows an unauthorized attacker to perform spoofing over a network.
Articles & Coverage 1
AnalysisAI
Authentication bypass via capture-replay in Microsoft Authentication Library (MSAL) for Node.js versions 1.0.0 through 5.5.x allows an unauthenticated network-adjacent attacker to spoof authenticated identity by replaying captured tokens. The CWE-294 root cause means a previously captured authentication artifact can be reused to impersonate a legitimate user, yielding high confidentiality and integrity impact consistent with the CVSS C:H/I:H scores. …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to achieve a network-intercept position capable of capturing a live MSAL authentication token from a Node.js application - for example, man-in-the-middle on a shared network segment, rogue Wi-Fi AP, or DNS/BGP hijack. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 7.4 with vector AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N accurately reflects the risk profile: exploitation is remotely feasible but requires a network-intercept position (AC:H), which substantially limits the attacker pool. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade @azure/msal-node to version 5.6.0 or later, which is confirmed as the fix boundary per EUVD-2026-73922 and the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-84003. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct a comprehensive inventory of all Node.js applications and services using MSAL, identifying instances running versions 1.0.0 through 5.5.x and cataloging their criticality and access scope. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
A vulnerability in the NuPoint Unified Messaging (NPM) component of Mitel MiCollab through 9.8 SP1 FP2 (9.8.1.201) could
FortiOS and FortiProxy contain an authentication bypass via the Node.js websocket module allowing unauthenticated remote
Denial of service against HTTP/2 server implementations allows remote unauthenticated attackers to exhaust server resour
Eval injection vulnerability in the internals.batch function in lib/batch.js in the bassmaster plugin before 1.5.2 for t
Flowise version 3.0.5 contains a remote code execution vulnerability in the CustomMCP node. The mcpServerConfig paramete
Node.js 8.5.0 before 8.6.0 allows remote attackers to access unintended files, because a change to ".." handling was inc
An issue was discovered in the node-serialize package 0.0.4 for Node.js. Rated critical severity (CVSS 9.8), this vulner
OpenSSL before 0.9.8za, 1.0.0 before 1.0.0m, and 1.0.1 before 1.0.1h does not properly restrict processing of ChangeCiph
Directory traversal vulnerability in the st module before 0.2.5 for Node.js allows remote attackers to read arbitrary fi
Multiple SQL injection vulnerabilities in the Manage Accounts page in the AccountManagement.asmx service in the Solarwin
The JS-YAML module before 2.0.5 for Node.js parses input without properly considering the unsafe !!js/function tag, whic
The AES-NI implementation in OpenSSL before 1.0.1t and 1.0.2 before 1.0.2h does not consider memory allocation during a
Same weakness CWE-294 – Authentication Bypass by Capture-replay
View allSame technique Authentication Bypass
View allShare
External POC / Exploit Code
Leaving vuln.today