esaqa Psono Server up to 7.5.0 Share Rights /share/right/ improper authorization

Summaryinfo

A vulnerability, which was classified as problematic, has been found in esaqa Psono Server up to 7.5.0. Affected by this issue is some unknown functionality of the file /share/right/ of the component Share Rights. This manipulation causes improper authorization. This vulnerability appears as CVE-2026-128970. The attack may be initiated remotely. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in esaqa Psono Server up to 7.5.0 and classified as problematic. Affected by this vulnerability is an unknown functionality of the file /share/right/ of the component Share Rights. The manipulation with an unknown input leads to a improper authorization vulnerability. The CWE definition for the vulnerability is CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect integrity, and availability. The summary by CVE is:

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.

The advisory is shared at gitlab.com. This vulnerability is known as CVE-2026-128970 since 11/13/2026. The exploitation appears to be easy. The attack can be launched remotely. Additional levels of successful authentication are necessary for exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1548.002 for this issue.

Upgrading to version 7.5.1 eliminates this vulnerability.

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Productinfo

Vendor

• esaqa

Name

• Psono Server

Version

• 7.0
• 7.1
• 7.2
• 7.3
• 7.4
• 7.5.0

CPE 2.3info

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CPE 2.2info

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