CVE-2026-33667 OpenProject: 2FA OTP Verification Missing Rate Limiting
Attackers can bypass two-factor authentication by brute-forcing OTP codes due to missing rate limiting, leading to account takeover.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-33667?
CVE-2026-33667 is a high-severity vulnerability in opf openproject, published on 15 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
OpenProject is an open-source project management application. In versions prior to 17.3.0, 2FA OTP verification in the confirm_otp action of the two_factor_authentication module has no rate limiting, lockout mechanism, or failed-attempt tracking. The existing brute_force_block_after_failed_logins setting only counts password login failures and does not apply to the 2FA verification stage, and neither the fail_login nor stage_failure methods increment any counter, lock the account, or add any delay. With the default TOTP drift window of ±60 seconds allowing approximately 5 valid codes at any time, an attacker who knows a user's password can brute-force the 6-digit TOTP code at roughly 5-10 attempts per second with an expected completion time of approximately 11 hours. The same vulnerability applies to backup code verification. This effectively allows complete 2FA bypass for any account where the password is known. This issue has been fixed in version 17.3.0.
Weakness: CWE-307
Which versions are affected by CVE-2026-33667?
It affects 1 product.
Products include Openproject Openproject.
How do I fix CVE-2026-33667?
No fix has been published for CVE-2026-33667 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-33667 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33667 exists.
Other vulnerabilities in opf openproject
- CVE-2026-34717 OpenProject: SQL Injection in Cost Reporting =n Operator via parse_number_string
- CVE-2026-25763 Command Injection on OpenProject repositories leads to Remote Code Execution
- CVE-2026-24685 OpenProject has Argument Injection on Repository module that allows Arbitrary File Write
- CVE-2026-32698 OpenProject has a SQL Injection via Custom Field Name that can be chained to Remote Code Execution
- CVE-2026-32703 OpenProject's repository files are served with the MIME type allowing them to be used to bypass Content Security Policy