CVE-2026-45129 MyBB: ACP Recovery Codes CSRF
Attackers can force administrators to regenerate two-factor authentication recovery codes via CSRF, potentially bypassing 2FA protections.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-45129?
CVE-2026-45129 is a medium-severity vulnerability in mybb, published on 18 Aug 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
MyBB is free and open source forum software. Prior to 1.8.40, the Admin CP Recovery Codes module does not validate requests correctly, allowing same-site attackers to rotate a victim administrator's recovery codes with a specially crafted URL. The Admin CP Home, Preferences, Recovery Codes action=recovery_codes page regenerates Two-Factor Authentication recovery codes in mybb_adminoptions.recovery_codes on GET requests without request forgery protection. The uniquely identifying implementation details include admin/modules/home/preferences.php. This issue is fixed in version 1.8.40.
Weakness: CWE-352
Which versions are affected by CVE-2026-45129?
How do I fix CVE-2026-45129?
No fix has been published for CVE-2026-45129 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-45129 being exploited?
There is no known exploitation of CVE-2026-45129 in the wild and no public exploit code.
Sources
Also known as GHSA-75vg-6wgp-mcc9.