CVE-2026-128970

Description

Psono Server Community Edition versions 1.12.6 through 7.5.0 and Psono Server Enterprise Edition before 7.5.1 do not require accepted group membership when authorizing deletion of group share-rights. The DELETE /share/right/ endpoint checks for a membership matching the target group, the authenticated user, and share_admin=True, but omits accepted=True. An authenticated remote attacker who has been invited to a group with share-admin privileges, and who knows a group share-right UUID, can therefore delete that group's share-right record without accepting the invitation or after declining it. Pending invitations have accepted=None, while declined invitations retain accepted=False and the share_admin flag. Deletion revokes the group's access to the affected share and its contained secrets for all accepted group members, without deleting the underlying data or disclosing secret contents. The issue was fixed in version 7.5.1 of both editions, released on 2026-10-13.

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

• 5.4CVSS 3.1, Mediumfrom the CNA (esaqa)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

What to do

• Upgrade Psono Server Community Edition and Psono Server Enterprise Edition to version 7.5.1 or later. Version 7.5.1 was released for both editions on 2026-10-13. The patch adds accepted=True to the User_Group_Membership authorization query in DeleteShareRightSerializer.validate, making group share-right deletion require both accepted membership and share_admin=True, matching the group authorization check in the create path.CNA solution statement
• Until the patch is deployed, use authorized group administration to remove pending and declined group memberships carrying share-admin privileges, or clear their share_admin flag. Avoid granting share-admin privileges to unaccepted invitees on affected versions.CNA workaround statement

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

An authenticated user with a pending or declined group invitation carrying share_admin=True can delete the group's share-right records, revoking that group's access to the affected shares and their contained secrets for all accepted group members. The underlying shares and secrets are not deleted, and secret contents are not disclosed. (CNA impact statement)

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

Timeline

1. 12 Oct 2026 Vulnerability reported to esaqa GmbH by Nicholas Mullenski / K70n0s510 (2026-10-12 21:45 CEST, UTC+02:00)
2. 13 Oct 2026 Vendor fix implemented in commit 86e7ce7fdbb04fc4ae3430cc434179630948d48d, included in version 7.5.1 of both editions.
3. 13 Nov 2026 Published

Weakness

• CWE-863

References

• Vendor fixpatch
• Psono 7.5.1 releaserelease-notes
• Vendor security advisory for CVE-2026-128970vendor-advisory
• Affected Community Edition deletion authorization in Psono 7.5.0technical-description
• Community Edition create-path acceptance check in Psono 7.5.0technical-description
• Community Edition membership decline behavior in Psono 7.5.0technical-description
• Introduction of the Community Edition invite-only deletion authorization pathtechnical-description
• Psono Server Community Edition source repositoryproduct