CVE-2026-49953
Discuz! X5.0 releases 20260320 through 20260610 contains a CAPTCHA bypass vulnerability that allows unauthenticated remote attackers to defeat challenge controls by exploiting limited complexity and predictable character sets in generated CAPTCHA images. Attackers can train a custom optical character recognition model against collected CAPTCHA samples to reliably predict challenge text, bypassing protections on login, registration, and other functionality from automated abuse.
- Affected products
- Discuzx
- Fix
- Available
- CVSS 4.0
- 6.9 MEDIUM
- CVSS 3.1
- 6.5 MEDIUM
- EPSS
- 0.4% (29th percentile)
- Weakness
- CWE-804
- NVD status
- Deferred
- Published
- 2026-06-15
CVE-2026-49953 at NVD
No indexed exploits for CVE-2026-49953 yet
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No exploit for CVE-2026-49953 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.