PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-56265 Crawl4AI CVE debrief

CVE-2026-56265 is a critical authentication bypass vulnerability in Crawl4AI before version 0.8.7. The vulnerability is caused by a hardcoded default JWT signing key in the Docker API server. This allows attackers who know the default key to forge valid authentication tokens for any user, bypassing authentication and gaining full access to protected functionality. The CVSS score for this vulnerability is 9.3, indicating a critical severity. Organizations using Crawl4AI should prioritize patching to prevent exploitation.

Vendor
Crawl4AI
Product
Unknown
CVSS
CRITICAL 9.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-21
Original CVE updated
2026-06-26
Advisory published
2026-06-21
Advisory updated
2026-06-26

Who should care

Organizations using Crawl4AI before version 0.8.7 should prioritize patching to prevent exploitation of this critical authentication bypass vulnerability. The vulnerability allows attackers to forge valid authentication tokens, potentially leading to unauthorized access and data breaches.

Technical summary

The vulnerability is caused by a hardcoded default JWT signing key in the Docker API server of Crawl4AI before version 0.8.7. This allows attackers to forge valid authentication tokens for any user, bypassing authentication and gaining full access to protected functionality. The CVSS vector for this vulnerability is CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X.

Defensive priority

High priority due to critical CVSS score of 9.3 and potential for unauthorized access

Recommended defensive actions

  • Inventory Crawl4AI installations to identify instances that may be vulnerable
  • Review official advisories for patching guidance
  • Apply patches or updates to Crawl4AI to address the hardcoded JWT signing key vulnerability
  • Implement compensating controls, such as additional authentication mechanisms, to limit exposure
  • Monitor Crawl4AI instances for suspicious activity

Evidence notes

The primary evidence for this vulnerability is the CVE-2026-56265 record and the NVD detail page. The vulnerability is caused by a hardcoded default JWT signing key in the Docker API server of Crawl4AI before version 0.8.7. Defenders should verify the version of Crawl4AI in use and review official advisories for patching guidance.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-56265 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-56265

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-56265 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-56265

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.