What is the CVSS score of CVE-2026-23646?

CVE-2026-23646 has a CVSS 3.1 base score of 6.5 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.0%.

Which versions of Openproject are affected by CVE-2026-23646?

Organizations using OpenProject should be aware of notable risk from CVE-2026-23646 rated CVSS 6.5. Exploitation could compromise the security of affected deployments.

How to fix or mitigate CVE-2026-23646?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Openproject CVE-2026-23646

MEDIUM

Exposure of Data Element to Wrong Session (CWE-488)

2026-01-19 security-advisories@github.com

Information Disclosure Openproject

6.5

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

6.5 MEDIUM

AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

CVE Published

Jan 19, 2026 - 18:16 nvd

MEDIUM 6.5

DescriptionGitHub Advisory

OpenProject is an open-source, web-based project management software. Users of OpenProject versions prior to 16.6.5 and 17.0.1 have the ability to view and end their active sessions via Account Settings → Sessions. When deleting a session, it was not properly checked if the session belongs to the user. As the ID that is used to identify these session objects use incremental integers, users could iterate requests using DELETE /my/sessions/:id and thus unauthenticate other users. Users did not have access to any sensitive information (like browser identifier, IP addresses, etc) of other users that are stored in the session. The problem was patched in OpenProject versions 16.6.5 and 17.0.1. No known workarounds are available as this does not require any permissions or other that can temporarily be disabled.

AnalysisAI

OpenProject versions prior to 16.6.5 and 17.0.1 fail to properly validate session ownership in the session deletion endpoint, allowing authenticated users to forcibly log out arbitrary other users by iterating through sequential session IDs. An attacker with valid credentials can exploit the predictable session ID scheme via DELETE requests to /my/sessions/:id to terminate other users' sessions without authorization. No patch is currently available, and this vulnerability requires only valid authentication to exploit.

Technical ContextAI

Affects Openproject. OpenProject is an open-source, web-based project management software. Users of OpenProject versions prior to 16.6.5 and 17.0.1 have the ability to view and end their active sessions via Account Settings → Sessions. When deleting a session, it was not properly checked if the session belongs to the user. As the ID that is used to identify these session objects use incremental integers, users could iterate requests using DELETE /my/sessions/:id and thus unauthenticate other users. Users did not h