What is CVE-2026-49953?

CVE-2026-49953 is a medium-severity vulnerability in Discuz! X5.0, classified under CWE-804. CVSS score: 6.5/10. Published 2026-06-15.

How severe is CVE-2026-49953?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Discuz! X5.0

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…

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.

Affected products

Discuz! X5.0 — versions 20260320

Weakness classification (CWE)

CWE-804

References

disclosure@vulncheck.com (technical-description)
disclosure@vulncheck.com (exploit)
disclosure@vulncheck.com (third-party-advisory)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2026-49953?: CVE-2026-49953 is a medium-severity vulnerability in Discuz! X5.0, classified under CWE-804. CVSS score: 6.5/10. Published 2026-06-15.
How severe is CVE-2026-49953?: Medium severity. CVSS v3 base score is 6.5 out of 10.