What is CVE-2026-89263?

CVE-2026-89263 is a medium-severity vulnerability, classified under Missing Authentication for Critical Function. CVSS score: 5.3/10. Published 2026-09-11.

How severe is CVE-2026-89263?

Medium severity. CVSS v3 base score is 5.3 out of 10.

CVE-2026-89263

CVE-2026-89263

MoguBlog through 6.2 fails to authenticate requests to the /web/comment/closeEmailNotification endpoint, allowing unauthenticated attackers to disable email notifications for arbitrary users. Remote callers can modify the startEmailNotification flag in Redis cache for any user identifier to suppress reply notifications without authorization.

Vulnerability class: Broken Authentication

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

disclosure@vulncheck.com (exploit)
disclosure@vulncheck.com (technical-description)
disclosure@vulncheck.com (technical-description)
disclosure@vulncheck.com (release-notes)
disclosure@vulncheck.com (product)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-89263?: CVE-2026-89263 is a medium-severity vulnerability, classified under Missing Authentication for Critical Function. CVSS score: 5.3/10. Published 2026-09-11.
How severe is CVE-2026-89263?: Medium severity. CVSS v3 base score is 5.3 out of 10.