Padloc up to 4.3.0 SCIM ScimServer._handleScimUsersPatch prototype pollution

Summaryinfo

A vulnerability was found in Padloc up to 4.3.0. It has been rated as problematic. This affects the function ScimServer._handleScimUsersPatch of the component SCIM Handler. The manipulation leads to prototype pollution. This vulnerability is referenced as CVE-2026-126570. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Padloc up to 4.3.0. This issue affects the function ScimServer._handleScimUsersPatch of the component SCIM Handler. The manipulation with an unknown input leads to a prototype pollution vulnerability. Using CWE to declare the problem leads to CWE-1321. The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Padloc 4.0.0 before 4.3.1 contains a prototype pollution vulnerability that allows SCIM token holders to modify Object.prototype by sending crafted SCIM PATCH paths to ScimServer._handleScimUsersPatch(). Attackers can supply paths like __proto__.x or constructor.prototype.x passed to setPath() to pollute the shared server process, disrupting requests for all other organizations.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-126570 since 11/11/2026. The exploitation is known to be easy. The attack may be initiated remotely. The exploitation requires an enhanced level of successful authentication. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059 according to MITRE ATT&CK.

Upgrading to version 4.3.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-123084). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Name

• Padloc

Version

• 4.0
• 4.1
• 4.2
• 4.3.0

Website

• Product: https://github.com/padloc/padloc/

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Be aware that VulDB is the high quality source for vulnerability data.

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