Mattermost Legal Hold Plugin up to 1.1.4 API authorization

CVSS Meta Temp Score
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CTI Interest Score
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7.4$0-$5k2.18

Summaryinfo

A vulnerability was found in Mattermost Legal Hold Plugin up to 1.1.4 and classified as critical. Affected by this vulnerability is an unknown functionality of the component API Handler. Such manipulation leads to authorization. This vulnerability is referenced as CVE-2026-3524. It is possible to launch the attack remotely. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Mattermost Legal Hold Plugin up to 1.1.4. Affected by this issue is an unknown code of the component API Handler. The manipulation with an unknown input leads to a authorization vulnerability. Using CWE to declare the problem leads to CWE-862. The product does not perform an authorization check when an actor attempts to access a resource or perform an action. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Mattermost Plugin Legal Hold versions <=1.1.4 fail to halt request processing after a failed authorization check in ServeHTTP which allows an authenticated attacker to access, create, download, and delete legal hold data via crafted API requests to the plugin's endpoints. Mattermost Advisory ID: MMSA-2026-00621

The weakness was published by Hassan Mohammed. The advisory is shared for download at mattermost.com. This vulnerability is handled as CVE-2026-3524 since 03/04/2026. The exploitation is known to be easy. The attack may be launched remotely. There are neither technical details nor an exploit publicly available.

Upgrading to version 1.1.5 eliminates this vulnerability.

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Productinfo

Type

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.6
VulDB Meta Temp Score: 7.4

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

CNA Base Score: 8.8
CNA Vector (Mattermost): 🔒

CVSSv2info

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

Exploitinginfo

Class: Authorization
CWE: CWE-862 / CWE-863 / CWE-285
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: Legal Hold Plugin 1.1.5

Timelineinfo

03/04/2026 CVE reserved
04/06/2026 +32 days Advisory disclosed
04/06/2026 +0 days VulDB entry created
04/06/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: mattermost.com
Researcher: Hassan Mohammed
Status: Confirmed

CVE: CVE-2026-3524 (🔒)
GCVE (CVE): GCVE-0-2026-3524
GCVE (VulDB): GCVE-100-355520

Entryinfo

Created: 04/06/2026 16:11
Changes: 04/06/2026 16:11 (65)
Complete: 🔍
Cache ID: 216:DC3:103

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