Missing membership acceptance check permits group share-right deletion by invitees in Psono Server
Summary
| CVE | CVE-2026-128970 |
|---|---|
| State | PUBLISHED |
| Assigner | esaqa |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-11-13 15:17:45 UTC |
| Updated | 2026-11-13 15:17:45 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 5.4 MEDIUM from fdf66990-8419-4c8c-8848-ec15d75773b4
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Problem Types: CWE-863 | CWE-863 CWE-863 Incorrect Authorization
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | fdf66990-8419-4c8c-8848-ec15d75773b4 | Secondary | 5.4 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L |
| 3.1 | CNA | CVSS | 5.4 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L |
CVSS v3.1 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Esaqa GmbH | Psono | affected 1.12.6 7.5.1 semver | Not specified |
| CNA | Esaqa GmbH | Psono | affected 7.5.1 semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| gitlab.com/esaqa/psono/psono-server/-/commit/86e7ce7fdbb04fc4ae3430cc434... | fdf66990-8419-4c8c-8848-ec15d75773b4 | gitlab.com | |
| gitlab.com/esaqa/psono/psono-server/-/blob/v7.5.0/psono/restapi/views/me... | fdf66990-8419-4c8c-8848-ec15d75773b4 | gitlab.com | |
| gitlab.com/esaqa/psono/psono-server/-/releases/v7.5.1 | fdf66990-8419-4c8c-8848-ec15d75773b4 | gitlab.com | |
| gitlab.com/esaqa/psono/psono-server/-/commit/11f9aa69dae370cd4f0213f4d03... | fdf66990-8419-4c8c-8848-ec15d75773b4 | gitlab.com | |
| gitlab.com/esaqa/psono/psono-server/-/blob/v7.5.0/psono/restapi/serializ... | fdf66990-8419-4c8c-8848-ec15d75773b4 | gitlab.com | |
| gitlab.com/esaqa/psono/psono-server/-/blob/v7.5.0/psono/restapi/serializ... | fdf66990-8419-4c8c-8848-ec15d75773b4 | gitlab.com | |
| gitlab.com/esaqa/esaqa/security-advisories/-/blob/master/advisories/CVE-... | fdf66990-8419-4c8c-8848-ec15d75773b4 | gitlab.com | |
| gitlab.com/esaqa/psono/psono-server | fdf66990-8419-4c8c-8848-ec15d75773b4 | gitlab.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Nicholas Mullenski / K70n0s510 (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2026-10-12T19:45:00.000Z | Vulnerability reported to esaqa GmbH by Nicholas Mullenski / K70n0s510 (2026-10-12 21:45 CEST, UTC+02:00) |
| CNA | 2026-10-13T05:18:00.000Z | Vendor fix implemented in commit 86e7ce7fdbb04fc4ae3430cc434179630948d48d, included in version 7.5.1 of both editions. |
Solutions
CNA: 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.
Workarounds
CNA: 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.