CVE-2026-84306 Filament: Multi-factor authentication (app) codes can still be used after a newer code has been used
Attackers with stolen credentials and one MFA code can bypass multi-factor authentication by reusing valid codes within the time window.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-84306?
CVE-2026-84306 is a medium-severity authentication bypass vulnerability in filamentphp filament, published on 1 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Filament is a collection of full-stack components for accelerated Laravel development. From 4.0.0 until 4.12.6 and 5.7.6, packages/panels/src/Auth/MultiFactor/App/AppAuthentication.php uses AppAuthentication::verifyCode() with a used-code cache key derived from both the app authentication secret and the submitted TOTP code. This isolates the newest accepted timestep by code instead of by secret, allowing a previously issued app-based MFA code to be accepted after a newer code has already been used. Reuse of the exact same code was already prevented, but another code inside the accepted time window remained usable. An attacker who obtains the target account's password and one app-based MFA code can use that code for the remainder of the configured window, which is approximately four minutes with the default settings, even after the legitimate account holder logs in with a newer code. Email-based MFA is not affected. This issue is fixed in versions 4.12.6 and 5.7.6.
Weakness: CWE-294
Which versions are affected by CVE-2026-84306?
4 open source packages ship an affected version, including filament/filament.
| Package | Affected | Fixed in |
|---|---|---|
filament/filament Packagist | From 4.0.0 | 4.12.6 |
filament/filament Packagist | From 4.0.0 | 4.12.6 |
filament/filament Packagist | From 5.0.0 | 5.7.6 |
filament/filament Packagist | From 5.0.0 | 5.7.6 |
How do I fix CVE-2026-84306?
Upgrade filament/filament to a fixed version for your release line: 4.12.6 or 5.7.6.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-84306 being exploited?
There is no known exploitation of CVE-2026-84306 in the wild and no public exploit code.
Sources
Also known as GHSA-r3j6-gpjw-qfjr.