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.
4.2	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Mattermost up to 9.11.8/10.3.3/10.4.2/10.5.0. The affected element is an unknown function of the component Archived Channel Handler. The manipulation leads to authorization. This vulnerability is documented as CVE-2025-24920. The attack can be initiated remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Mattermost up to 9.11.8/10.3.3/10.4.2/10.5.0. It has been rated as problematic. This issue affects an unknown functionality of the component Archived Channel Handler. The manipulation with an unknown input leads to a authorization vulnerability. Using CWE to declare the problem leads to CWE-863. The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions. Impacted is integrity. The summary by CVE is:

Mattermost versions 10.4.x <= 10.4.2, 10.3.x <= 10.3.3, 9.11.x <= 9.11.8, 10.5.x <= 10.5.0 fail to restrict bookmark creation and updates in archived channels, which allows authenticated users created or update bookmarked in archived channels

The weakness was released by Caleb Roseland. The advisory is shared at mattermost.com. The identification of this vulnerability is CVE-2025-24920 since 03/20/2025. The exploitation is known to be easy. The attack may be initiated remotely. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 233452 (Mattermost Server 10.4.x < 10.4.3 / 10.3.x < 10.3.4 /9.11.x < 9.11.9 / 10.5.x < 10.5.1 (MMSA-2025-00432)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 9.11.9, 10.3.4, 10.4.3, 10.5.1 or 10.6.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (233452). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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
• 10.0
• 10.1
• 10.2
• 10.3
• 10.3.0
• 10.3.1
• 10.3.2
• 10.3.3
• 10.4
• 10.4.0
• 10.4.1
• 10.4.2
• 10.5.0

License

• open-source

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.2

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 4.3
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: Authorization
CWE: CWE-863 / CWE-285 / CWE-266
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: 233452
Nessus Name: Mattermost Server 10.4.x < 10.4.3 / 10.3.x < 10.3.4 /9.11.x < 9.11.9 / 10.5.x < 10.5.1 (MMSA-2025-00432)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Mattermost 9.11.9/10.3.4/10.4.3/10.5.1/10.6.0

Timelineinfo

03/20/2025 🔍
03/21/2025 +1 days 🔍
03/21/2025 +0 days 🔍
03/28/2025 +7 days 🔍

Sourcesinfo

Advisory: mattermost.com
Researcher: Caleb Roseland
Status: Confirmed

CVE: CVE-2025-24920 (🔍)
GCVE (CVE): GCVE-0-2025-24920
GCVE (VulDB): GCVE-100-300581

Entryinfo

Created: 03/21/2025 10:00
Updated: 03/28/2025 23:01
Changes: 03/21/2025 10:00 (64), 03/28/2025 23:01 (2)
Complete: 🔍
Cache ID: 216:EF6:103

Discussion

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