Automattic Sensei LMS Plugin up to 4.26.3 on WordPress Legacy Message save_new_message post_id access control

CVSS Meta Temp Score
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CTI Interest Score
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5.2$0-$5k1.79

Summaryinfo

A vulnerability, which was classified as critical, has been found in Automattic Sensei LMS Plugin up to 4.26.3. The affected element is the function save_new_message of the component Legacy Message Handler. This manipulation of the argument post_id causes access control. This vulnerability is registered as CVE-2026-112329. Remote exploitation of the attack is possible. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Automattic Sensei LMS Plugin up to 4.26.3. It has been declared as critical. Affected by this vulnerability is the function save_new_message of the component Legacy Message Handler. The manipulation of the argument post_id with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

The Sensei LMS WordPress plugin before 4.26.4 contains a broken access control vulnerability in the legacy save_new_message handler hooked on the init action, which validates only a generic nonce without verifying course enrollment or restricting post_id to valid post types. Authenticated attackers, including unprivileged Subscribers, can supply an arbitrary post_id for any course, lesson, or quiz to create a private message addressed to that post's author, bypassing the enrollment checks enforced by the newer REST send-message controller.

It is possible to read the advisory at senseilms.com. This vulnerability is known as CVE-2026-112329 since 10/19/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

Upgrading to version 4.26.4 eliminates this vulnerability.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.2

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 4.3
CNA Vector (VulnCheck): 🔒

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-284 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Sensei LMS Plugin 4.26.4

Timelineinfo

10/19/2026 Advisory disclosed
10/19/2026 +0 days CVE reserved
10/19/2026 +0 days VulDB entry created
10/19/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: senseilms.com
Status: Confirmed

CVE: CVE-2026-112329 (🔒)
GCVE (CVE): GCVE-0-2026-112329
GCVE (VulDB): GCVE-100-422395

Entryinfo

Created: 10/19/2026 17:00
Changes: 10/19/2026 17:00 (41), 10/19/2026 17:01 (38)
Complete: 🔍
Cache ID: 216::103

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