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CVE-2026-21876 — CVE-2026-21876 PoC: WAF charset bypass (Flask, ASP.NET and Spring Boot stands) | Kitploit
Tools/GitHubGitHub/daytriftnewgen/cve-2026-21876
Vulnerability AnalysisIDS/IPS EvasionWeb Application ExploitationWAF BypassWeb SecurityPenetration Testing
GitHubdaytriftnewgen/cve-2026-21876

CVE-2026-21876

CVE-2026-21876 PoC: WAF charset bypass (Flask, ASP.NET and Spring Boot stands)

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2 months agoNot yet reviewed

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CVE-2026-21876 (OWASP CRS WAF bypass)

CVE-2026-21876 docker container + minimal PoC.

I would like to thank @airween and @fzipi separately for their quick response! The vulnerability fix was ready in a very short time.

PoC

Run:

root@kitploit:~
cd springboot_undertow_stand # or aspnet_stand
docker compose up --build
python3 demo/send.py            # BASELINE -> 403, BYPASS -> 200 + reconstructed payload

References

  • Github security advisory
  • OWASP CRS walkthrough blogpost
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