themeum Kirki Plugin up to 6.1.1 on WordPress Frontend Collection Endpoint authorization

Summaryinfo

A vulnerability labeled as problematic has been found in themeum Kirki Plugin up to 6.1.1. Affected by this issue is some unknown functionality of the component Frontend Collection Endpoint. The manipulation results in authorization. This vulnerability was named CVE-2026-18347. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in themeum Kirki Plugin up to 6.1.1. It has been classified as problematic. Affected is an unknown part of the component Frontend Collection Endpoint. The manipulation with an unknown input leads to a authorization vulnerability. CWE is classifying the issue as CWE-639. The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. This is going to have an impact on confidentiality. CVE summarizes:

The Kirki – Freeform Page Builder, Website Builder & Customizer plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 6.1.1. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for authenticated attackers, with custom-level access and above, to read arbitrary user metadata and sensitive user record fields — including email address, assigned roles, registration date, and any user_meta values — belonging to any WordPress user including administrators, by supplying a target user ID with a user-type context to the frontend collection endpoint.

The advisory is shared for download at wordfence.com. This vulnerability is traded as CVE-2026-18347 since 07/30/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/16/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-59929). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• WordPress Plugin

Vendor

• themeum

Name

• Kirki Plugin

Version

• 6.1.0
• 6.1.1

CPE 2.3info

• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Discussion