Oliver Günther

4 exploits Active since Jul 2017
CVE-2026-40896 WRITEUP MEDIUM WRITEUP
OpenProject has Cross-Project Meeting Agenda Item Injection via Unscoped Section Lookup
OpenProject is open-source, web-based project management software. Prior to version 17.3.0, a user with `manage_agendas` permission in any project can inject agenda items into meetings belonging to any other project on the instance — even projects they have no access to. No knowledge of the target project, meeting, or victim is required; the attacker can blindly spray items into every meeting on the instance by iterating sequential section IDs. Version 17.3.0 patches the issue.
CVSS 6.5
CVE-2017-11667 WRITEUP HIGH WRITEUP
OpenProject <6.1.6 & <7.0.3 - Info Disclosure
OpenProject before 6.1.6 and 7.x before 7.0.3 mishandles session expiry, which allows remote attackers to perform APIv3 requests indefinitely by leveraging a hijacked session.
CVSS 8.1
CVE-2026-22602 WRITEUP LOW WRITEUP
OpenProject < 16.6.2 - Authenticated Exposure of Sensitive User Information via Sequential User ID Enumeration
OpenProject is an open-source, web-based project management software. Prior to version 16.6.2, a low‑privileged logged-in user can view the full names of other users. Since user IDs are assigned sequentially and predictably (e.g., 1 to 1000), an attacker can extract a complete list of all users’ full names by iterating through these URLs. The same behavior can also be reproduced via the OpenProject API, allowing automated retrieval of full names through the API as well. This issue has been patched in version 16.6.2. Those who are unable to upgrade may apply the patch manually.
CVSS 3.5
CVE-2026-22603 WRITEUP MEDIUM WRITEUP
OpenProject < 16.6.2 - Unauthenticated Brute-Force Attack via Password Change Endpoint
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.
CVSS 6.5