Last seen January 29, 2026

Claude Authentication Bypass

Evidence indicates that Claude is affected by authentication bypass.

Technical Severity

Medium severity

Lifecycle Status

DEVELOPING

Sources

2 sources: anthropic.com, wiz.io

What Happened

Evidence indicates that Claude is affected by authentication bypass.

Why This Matters

The evidence matters to defenders using Claude because it could allow access without the expected authentication controls.

Recommended Action

No confirmed vendor remediation is available in the current evidence. Confirm whether Claude is present in your environment and review the affected configuration.

Follow this incident as it develops Material-change notifications are being prepared for BugSkan Pro.

Exposure

Recommended Response

First Seen

Oct 03, 2025 05:30

Last Seen

Jan 29, 2026 05:30

Exploitation status: UNKNOWN

Primary entities:

Amazon AWS Anthropic Google Claude Gemini AI Agents

Timeline

Incident first seen
Oct 03, 2025 05:30
BugSkan first recorded this incident.
Building AI for cyber defenders - Anthropic
Oct 03, 2025 05:30
anthropic.com · Vulnerability
AI Agents vs Humans: Who Wins at Web Hacking in 2026? - wiz.io
Jan 29, 2026 05:30
wiz.io · Vulnerability
Latest observed development
Jan 29, 2026 05:30
Most recent source or update associated with this incident.
Material change
Aug 18, 2026 14:07
WATCH -> ACT
Material change
Aug 18, 2026 14:07
affected versions updated
Material change
Aug 18, 2026 14:07
recommended action updated
Material change
Aug 18, 2026 14:07
why it matters updated
Material change
Aug 18, 2026 14:07
severity 3.0 -> 5.8

Sources

Building AI for cyber defenders - Anthropic

anthropic.com · Oct 03, 2025 05:30

Claude Sonnet 4.5 demonstrates significant advancements in cybersecurity defense, exhibiting enhanced capabilities in detecting, analyzing, and patching software vulnerabilities. Evaluations like Cybench and CyberGym show its proficiency in identifying both known and novel vulnerabilities in codebases and deployed systems, often outperforming previous models and human teams.

Open publisher source

AI Agents vs Humans: Who Wins at Web Hacking in 2026? - wiz.io

wiz.io · Jan 29, 2026 05:30

AI agents, including Claude Sonnet 4.5, GPT-5, and Gemini 2.5 Pro, demonstrated high proficiency by solving 9 out of 10 lab challenges that simulated real-world web application vulnerabilities with minimal cost. These successes encompassed exploits like authentication bypass, IDOR, stored XSS, S3 bucket takeover, and AWS IMDS SSRF, highlighting AI's capability for multi-step reasoning and rapid pattern recognition.

Open publisher source

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