Psono Server Community and Enterprise Editions Authorization Flaw
CVE-2026-128970

5.4MEDIUM

Key Information:

Vendor

Esaqa Gmbh

Status
Psono
Vendor
CVE Published:
13 November 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-128970?

Psono Server versions 1.12.6 through 7.5.0 of the Community Edition and prior to 7.5.1 of the Enterprise Edition contain an authorization flaw. An attacker with group share-admin privileges can delete group share-right records without having accepted a group invitation. This occurs because the authorization check neglects to verify accepted group membership when executing delete operations. As a result, the attacker can remove access to shared groups and their secrets, impacting all valid group members. The issue was rectified in version 7.5.1, released on October 13, 2026.

Affected Version(s)

Psono 1.12.6 < 7.5.1

Psono 0 < 7.5.1

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

security-advisories
Created by R00t3dbyFa17h

References

https://gitlab.com/esaqa/psono/psono-server/-/commit/86e7...
patch
https://gitlab.com/esaqa/psono/psono-server/-/releases/v7...
release-notes
https://gitlab.com/esaqa/esaqa/security-advisories/-/blob...
vendor-advisory

CVSS V3.1

Score:
5.4
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Nicholas Mullenski / K70n0s510
.