Mattermost up to 9.11.12/10.5.3/10.6.2/10.7.0 Access Token incorrect implementation of authentication algorithm

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.7	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as critical, was found in Mattermost up to 9.11.12/10.5.3/10.6.2/10.7.0. This impacts an unknown function of the component Access Token Handler. The manipulation results in incorrect implementation of authentication algorithm. This vulnerability is cataloged as CVE-2025-3230. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Mattermost up to 9.11.12/10.5.3/10.6.2/10.7.0. It has been classified as critical. Affected is some unknown functionality of the component Access Token Handler. The manipulation with an unknown input leads to a incorrect implementation of authentication algorithm vulnerability. CWE is classifying the issue as CWE-303. The requirements for the product dictate the use of an established authentication algorithm, but the implementation of the algorithm is incorrect. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Mattermost versions 10.7.x <= 10.7.0, 10.6.x <= 10.6.2, 10.5.x <= 10.5.3, 9.11.x <= 9.11.12 fails to properly invalidate personal access tokens upon user deactivation, allowing deactivated users to maintain full system access by exploiting access token validation flaws via continued usage of previously issued tokens.

The weakness was shared by eAhmed. The advisory is shared for download at mattermost.com. This vulnerability is traded as CVE-2025-3230 since 04/03/2025. 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 vulnerability scanner Nessus provides a plugin with the ID 237904 (Mattermost Server 9.11.x < 9.11.13 / 10.5.x < 10.5.4 / 10.6.x < 10.6.3 / 10.7.1 Multiple Vulnerabilities (MMSA-2025-00458, MMSA-2025-00463, MMSA-2025-00467)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 9.11.13, 10.5.4, 10.6.3, 10.7.1 or 10.8.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (237904). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Groupware Software

Name

• Mattermost

Version

• 9.11.0
• 9.11.1
• 9.11.2
• 9.11.3
• 9.11.4
• 9.11.5
• 9.11.6
• 9.11.7
• 9.11.8
• 9.11.9
• 9.11.10
• 9.11.11
• 9.11.12
• 10.0
• 10.1
• 10.2
• 10.3
• 10.4
• 10.5
• 10.5.0
• 10.5.1
• 10.5.2
• 10.5.3
• 10.6
• 10.6.0
• 10.6.1
• 10.6.2
• 10.7.0

License

• open-source

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.7

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

CNA Base Score: 5.4
CNA Vector (Mattermost): 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Incorrect implementation of authentication algorithm
CWE: CWE-303
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 237904
Nessus Name: Mattermost Server 9.11.x < 9.11.13 / 10.5.x < 10.5.4 / 10.6.x < 10.6.3 / 10.7.1 Multiple Vulnerabilities (MMSA-2025-00458, MMSA-2025-00463, MMSA-2025-00467)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Mattermost 9.11.13/10.5.4/10.6.3/10.7.1/10.8.0

Timelineinfo

04/03/2025 🔍
05/30/2025 +57 days 🔍
05/30/2025 +0 days 🔍
06/08/2025 +9 days 🔍

Sourcesinfo

Advisory: mattermost.com
Researcher: eAhmed
Status: Confirmed

CVE: CVE-2025-3230 (🔍)
GCVE (CVE): GCVE-0-2025-3230
GCVE (VulDB): GCVE-100-310704

Entryinfo

Created: 05/30/2025 18:01
Updated: 06/08/2025 08:56
Changes: 05/30/2025 18:01 (64), 06/08/2025 08:56 (2)
Complete: 🔍
Cache ID: 216::103

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

Discussion

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