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CVE-2026-22603— OpenProject has no protection against brute-force attacks in the Change Password function

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 16.6.2之前版本存在安全漏洞，该漏洞源于未受保护的密码更改端点缺少暴力破解防护，可能导致账户破解和权限提升。

AI Predicted 9.1 Difficulty: Easy EPSS 0.26% · P16
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I. Basic Information for CVE-2026-22603

Vulnerability Information
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Vulnerability Title
OpenProject has no protection against brute-force attacks in the Change Password function
Source: CVE Program / CVE List V5
Vulnerability Description
OpenProject is an open-source, web-based project management software. Prior to version 16.6.2, OpenProject’s unauthenticated password-change endpoint (/account/change_password) was not protected by the same brute-force safeguards that apply to the normal login form. In affected versions, an attacker who can guess or enumerate user IDs can send unlimited password-change requests for a given account without triggering lockout or other rate-limiting controls. This allows automated password-guessing (e.g., with wordlists of common passwords) against valid accounts. Successful guessing results in full account compromise for the targeted user and, depending on that user’s role, can lead to further privilege escalation inside the application. This issue has been patched in version 16.6.2. Those who are unable to upgrade may apply the patch manually.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA: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 16.6.2之前版本存在安全漏洞，该漏洞源于未受保护的密码更改端点缺少暴力破解防护，可能导致账户破解和权限提升。
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 < 16.6.2 -

II. Public POCs for CVE-2026-22603

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III. Intelligence Information for CVE-2026-22603

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Patches & Fixes for CVE-2026-22603 (1)

Other References for CVE-2026-22603 (1)

Same Patch Batch · opf · 2026-01-10 · 6 CVEs total

CVE-2026-22600 9.1 CRITICAL OpenProject is Vulnerable to Arbitrary File Read via ImageMagick SVG Coder
CVE-2026-22605 4.3 MEDIUM OpenProject is Vulnerable to Insecure Direct Object Reference in Meetings
CVE-2026-22602 3.5 LOW OpenProject is Vulnerable to User Enumeration via User ID
CVE-2026-22604 OpenProject is vulnerable to user enumeration via the change password function
CVE-2026-22601 OpenProject is Vulnerable to Code Execution in E-Mail function

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-22603

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