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Jwt Attack EUVDEUVD-2026-44355

| CVE-2026-47304 CRITICAL
Improper Verification of Cryptographic Signature (CWE-347)
2026-07-14 microsoft GHSA-g8r8-53c2-pm3f
Authentication Bypass Microsoft Jwt Attack Microsoft Visual Studio 2022 Version 17 12 Microsoft Visual Studio 2022 Version 17 14 Microsoft Visual Studio 2026 Version 18 7
9.8
CVSS 3.1 · NVD
Temporal: 7.1
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Vulnerability Assessment

Weakness
CWE
CWE-347
OWASP Top 10:2025
A04:2025 - Cryptographic Failures
ASVS 5.0
V11 - Cryptography Signature verification
Act Now Prioritize within 24-48h. Why: CRITICAL severity + public POC available.
Patch available 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Jul 14, 2026

Security feature bypass in Microsoft .NET (shipped via Visual Studio 2022 17.12/17.14 and Visual Studio 2026 18.7) lets a remote, unauthenticated attacker defeat a cryptographic-signature check over the network — most likely a JWT/token signature verification flaw per the vendor 'Jwt Attack' and 'Authentication Bypass' tags. By forging or tampering with signed data the runtime fails to validate correctly, an attacker can impersonate trusted principals and undermine an authentication or integrity control. Microsoft has released a patch; there is no public exploit identified at time of analysis and it is not listed in CISA KEV.

Affected VersionsENISA

Microsoft Visual Studio 2022 version 17.12 17.12.0 <17.12.22
Microsoft Visual Studio 2022 version 17.14 17.14.0 <17.14.36
Microsoft Visual Studio 2026 version 18.7 18.0 <18.7.4

Affected Packages

microsoft visual_studio_2022_version_17_12_17_12_22 fix: Microsoft Visual Studio 2022 version 17.12 17.12.22
microsoft visual_studio_2022_version_17_14_17_14_36 fix: Microsoft Visual Studio 2022 version 17.14 17.14.36
microsoft visual_studio_2026_version_18_7_18_7_4 fix: Microsoft Visual Studio 2026 version 18.7 18.7.4
nuget system.security.cryptography.xml fix: 8.0.4, 9.0.18, 10.0.10
euvd microsoft_visual_studio_2022_version_17_12 fix: 17.12.22
euvd microsoft_visual_studio_2022_version_17_14 fix: 17.14.36
euvd microsoft_visual_studio_2026_version_18_7 fix: 18.7.4

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 7 packages in microsoft, nuget, euvd

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

Vendor (microsoft) PRIMARY HIGH
NVD 9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
ENISA EUVD HIGH
CIRCL (temporal) 7.1 HIGH
SUSE HIGH
Red Hat 8.1 HIGH

Primary rating from Vendor (microsoft).

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Severity Changed
Jul 24, 2026 - 13:52 NVD
HIGH CRITICAL
CVSS changed
Jul 24, 2026 - 13:52 NVD
8.1 (HIGH) 9.8 (CRITICAL)
CVE Published
Jul 14, 2026 - 18:45 nvd
HIGH 8.1

DescriptionNVD

Improper verification of cryptographic signature in .NET allows an unauthorized attacker to bypass a security feature over a network.

Executive ViewAI

Why It Matters

A critical security bypass in Microsoft .NET (Visual Studio 2022 versions 17.12/17.14 and Visual Studio 2026 version 18.7) allows unauthenticated remote attackers to forge authentication tokens and impersonate legitimate users in .NET applications. No public exploit identified at time of analysis. Development teams and organizations using affected Visual Studio versions should prioritize immediate patching to prevent unauthorized access and account takeover.

Recommended Action

Within 24 hours, identify all systems running Visual Studio 2022 versions 17.12, 17.14, or Visual Studio 2026 version 18.7, and audit which deployed .NET applications depend on cryptographic signature verification for JWT or token-based authentication. Within 7 days, apply the vendor-released patch for all affected Visual Studio versions and recompile any affected .NET assemblies with the patched runtime. Within 30 days, complete security validation testing of authentication flows and review access logs for suspicious token-based activity during the exposure window.

Business Impact: High
Compensating Controls

Apply vendor patch.

Threat Intelligence Overview

EPSS Score
0.2%
Top 90% exploitable
Threat Intel
2
1 sources
Vendor Action
See Below
Required. The vulnerability documented by this CVE requires customer action to resolve.
Vendor Status
Publicly Disclosed:No
Exploited:No
Latest Software Release:Exploitation Less Likely
Exploit
POC
Public exploit code exists
Data Quality
9 sources
Confidence: High
EUVD NVD CVE.org EPSS Vulnrichment NCSC-NL GHSA MSRC Vendor GitHub VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity CRITICAL
CISA KEV No
Public POC Yes
EPSS 0.2%
Patch available Yes
Active threat No
Deciding rule
CRITICAL severity + public POC available
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision
Scheduled
Exploitation
None
System Exposure· derived
Open
Automatable
No
Human Impact
High
Technical Impact
Total

Priority Score

74
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +49
PoC: +20
Weaponized: 0
Threat intel: 0
Gov advisory: +5

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

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Same weakness CWE-347 – Improper Verification of Cryptographic Signature

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Liberty Linux 10 Fixed
SUSE Liberty Linux 8 Fixed
SUSE Liberty Linux 9 Fixed

References

Advisories & patches
PATCH https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47304 ADVISORY https://access.redhat.com/errata/RHSA-2026:39952 ADVISORY https://access.redhat.com/errata/RHSA-2026:41893 ADVISORY https://access.redhat.com/errata/RHSA-2026:41894 ADVISORY https://access.redhat.com/errata/RHSA-2026:41895 ADVISORY https://access.redhat.com/errata/RHSA-2026:41896 ADVISORY https://access.redhat.com/errata/RHSA-2026:41897 ADVISORY https://access.redhat.com/errata/RHSA-2026:41898 ADVISORY https://access.redhat.com/errata/RHSA-2026:41899 ADVISORY https://access.redhat.com/errata/RHSA-2026:41900 ADVISORY https://access.redhat.com/errata/RHSA-2026:41901 ADVISORY https://access.redhat.com/errata/RHSA-2026:42145 ADVISORY https://ubuntu.com/security/notices/USN-8553-1 ADVISORY https://vuldb.com/vuln/378618 ADVISORY https://www.herodevs.com/vulnerability-directory/cve-2026-47304

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