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TI-2026-19040 Aliases CVE-2026-23646

OpenProject users can delete other user's session, causing them to be logged out

Priority LOW 29CWE-488Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00374 31st percentileScored 2026-11-07
Fix Fixed openproject (opf): 16.6.5

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
opfopenprojectbefore 16.6.5; = 17.0.016.6.5Patch availableCNA
  • openproject Vendoropf Affected before 16.6.5; = 17.0.0 Fixed in 16.6.5 Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:openproject:openproject:*:*:*:*:*:*:*:*before 16.6.5Vulnerableopf
cpe:2.3:a:openproject:openproject:17.0.0:*:*:*:*:*:*:*17.0.0Vulnerableopf
  • cpe:2.3:a:openproject:openproject:*:*:*:*:*:*:*:* Versions before 16.6.5 Vulnerable ·opf
  • cpe:2.3:a:openproject:openproject:17.0.0:*:*:*:*:*:*:* Versions 17.0.0 Vulnerable ·opf

Remediation

  • Fix · CNA openproject (opf) Fixed in 16.6.5

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-23646

References

Advisory 1

Other 2

  • TI-2019-08673 A SQL injection vulnerability in the activities API in OpenProject before 8.3.2 allows a… CVSS 3.0HIGH 8.1
  • TI-2026-26047 OpenProject: 2FA OTP Verification Missing Rate Limiting CVSS 3.1HIGH 7.4
  • TI-2026-29552 OpenProject has Cross-Project Meeting Agenda Item Injection via Unscoped Section Lookup CVSS 3.1HIGH 7.1
  • TI-2023-14850 OpenProject user sessions not terminated after activation of 2FA CVSS 3.1MEDIUM 6.5
  • TI-2026-18162 OpenProject is Vulnerable to Code Execution in E-Mail function CVSS 4.0HIGH 8.6
  • TI-2026-26961 OpenProject: SQL Injection in Cost Reporting =n Operator via parse_number_string CVSS 3.1CRITICAL 9.9
See all 36 →

Sources

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