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CVE-2026-33667— OpenProject: 2FA OTP Verification Missing Rate Limiting

Quick assessment

Affected
opf openproject
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenProject是OpenProject开源的一个基于Web的项目管理软件。 OpenProject 17.3.0之前版本存在安全漏洞，该漏洞源于two_factor_authentication模块的confirm_otp操作中2FA OTP验证缺少速率限制、锁定机制或失败尝试跟踪，可能导致完全绕过双因素认证。

CVSS 7.4 · High EPSS 0.40% · P32
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I. Basic Information for CVE-2026-33667

Vulnerability Information
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Vulnerability Title
OpenProject: 2FA OTP Verification Missing Rate Limiting
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
过多认证尝试的限制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
OpenProject 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenProject是OpenProject开源的一个基于Web的项目管理软件。 OpenProject 17.3.0之前版本存在安全漏洞，该漏洞源于two_factor_authentication模块的confirm_otp操作中2FA OTP验证缺少速率限制、锁定机制或失败尝试跟踪，可能导致完全绕过双因素认证。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
opf openproject < 17.3.0 -

II. Public POCs for CVE-2026-33667

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III. Intelligence Information for CVE-2026-33667

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Vendor Advisories for CVE-2026-33667 (1)

IV. Related Vulnerabilities

Same product: openproject
Same vendor: opf
Same weakness: CWE-307

V. Comments for CVE-2026-33667

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