CVE-2026-128970
Missing membership acceptance check permits group share-right deletion by invitees in Psono Server
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.
Fixes and workarounds
Fix
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.
Source: CNA: esaqaWorkaround
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.
Source: CNA: esaqaFix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: esaqaAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| Psono esaqa GmbH |
≥ 1.12.6; < 7.5.1 (affected, semver)
Other versions: unaffected |
CNA: esaqa |
| Psono esaqa GmbH |
≥ 0; < 7.5.1 (affected, semver)
Other versions: unaffected |
CNA: esaqa |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 5.4 medium |
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L | CNA: esaqa |
| 3.1 / 5.4 medium |
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L | NVD: fdf66990-8419-4c8c-8848-ec15d75773b4 |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://gitlab.com/esaqa/psono/psono-server/-/commit/86e7ce7fdbb04fc4ae3430cc434179630948d48dCNA: esaqa · patch
- https://gitlab.com/esaqa/psono/psono-server/-/releases/v7.5.1CNA: esaqa · release-notes
- https://gitlab.com/esaqa/esaqa/security-advisories/-/blob/master/advisories/CVE-2026-128970.mdCNA: esaqa · vendor-advisory
- https://gitlab.com/esaqa/psono/psono-server/-/blob/v7.5.0/psono/restapi/serializers/delete_share_right.pyCNA: esaqa · technical-description
- https://gitlab.com/esaqa/psono/psono-server/-/blob/v7.5.0/psono/restapi/serializers/create_share_right.pyCNA: esaqa · technical-description
- https://gitlab.com/esaqa/psono/psono-server/-/blob/v7.5.0/psono/restapi/views/membership_decline.pyCNA: esaqa · technical-description
- https://gitlab.com/esaqa/psono/psono-server/-/commit/11f9aa69dae370cd4f0213f4d03d1b1cc4df36ddCNA: esaqa · technical-description
- https://gitlab.com/esaqa/psono/psono-serverCNA: esaqa · product
- https://gitlab.com/esaqa/esaqa/security-advisories/-/blob/master/advisories/CVE-2026-128970.mdfdf66990-8419-4c8c-8848-ec15d75773b4
- https://gitlab.com/esaqa/psono/psono-serverfdf66990-8419-4c8c-8848-ec15d75773b4
- https://gitlab.com/esaqa/psono/psono-server/-/blob/v7.5.0/psono/restapi/serializers/create_share_right.pyfdf66990-8419-4c8c-8848-ec15d75773b4
- https://gitlab.com/esaqa/psono/psono-server/-/blob/v7.5.0/psono/restapi/serializers/delete_share_right.pyfdf66990-8419-4c8c-8848-ec15d75773b4
- https://gitlab.com/esaqa/psono/psono-server/-/blob/v7.5.0/psono/restapi/views/membership_decline.pyfdf66990-8419-4c8c-8848-ec15d75773b4
- https://gitlab.com/esaqa/psono/psono-server/-/commit/11f9aa69dae370cd4f0213f4d03d1b1cc4df36ddfdf66990-8419-4c8c-8848-ec15d75773b4
- https://gitlab.com/esaqa/psono/psono-server/-/commit/86e7ce7fdbb04fc4ae3430cc434179630948d48dfdf66990-8419-4c8c-8848-ec15d75773b4
- https://gitlab.com/esaqa/psono/psono-server/-/releases/v7.5.1fdf66990-8419-4c8c-8848-ec15d75773b4
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