PentesterLab on Mythryl: “🔥 CVE-2026-23993: HarbourJwt JWT auth bypass via unknown alg. Not…”

🔥 CVE-2026-23993: HarbourJwt JWT auth bypass via unknown alg. Not just alg=none: unsupported alg => empty signature, so forged token header.payload. passes. Write-up + fix: pentesterlab.com/blog/cve-202...

pentesterlab.comCVE-2026-23993: JWT authentication bypass in HarbourJwt via “unknown alg”I didn't know Harbour even existed as a language when I found this bug. The fun part is that I also ...

21/1/26, 10:12 pm6 reposts6 likes

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