VDB-332459 · CVE-2025-11776 · EUVD-2025-186558

Mattermost up to 10.x Archived Channel Search API search_archived authorization

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 10.x. The affected element is an unknown function of the file /api/v4/teams/{team_id}/channels/search_archived of the component Archived Channel Search API. The manipulation leads to authorization. This vulnerability is traded as CVE-2025-11776. It is possible to initiate the attack remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Mattermost up to 10.x. It has been rated as problematic. This issue affects an unknown functionality of the file /api/v4/teams/{team_id}/channels/search_archived of the component Archived Channel Search API. 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 confidentiality. The summary by CVE is:

Mattermost versions <11 fail to properly restrict access to archived channel search API which allows guest users to discover archived public channels via the `/api/v4/teams/{team_id}/channels/search_archived` endpoint

The weakness was shared by lordwillmore. It is possible to read the advisory at mattermost.com. The identification of this vulnerability is CVE-2025-11776 since 10/15/2025. The exploitation is known to be easy. The attack may be initiated remotely. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 11.0.0 eliminates this vulnerability.

The vulnerability is also documented in the databases at EUVD (EUVD-2025-186558) and CERT Bund (WID-SEC-2025-2315). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

Mattermost Mattermost

Productinfo

Type

Groupware Software

Name

Mattermost

Version

10.x

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

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Mattermost 11.0.0

Timelineinfo

10/15/2025 CVE reserved
11/14/2025 +30 days Advisory disclosed
11/14/2025 +0 days VulDB entry created
11/28/2025 +14 days VulDB entry last update

Sourcesinfo

Advisory: mattermost.com
Researcher: lordwillmore
Status: Confirmed

CVE: CVE-2025-11776 (🔒)
GCVE (CVE): GCVE-0-2025-11776
GCVE (VulDB): GCVE-100-332459
EUVD: 🔒
CERT Bund: WID-SEC-2025-2315 - Mattermost Server und Mobile: Mehrere Schwachstellen

Entryinfo

Created: 11/14/2025 11:10
Updated: 11/28/2025 16:14
Changes: 11/14/2025 11:10 (65), 11/14/2025 17:43 (1), 11/18/2025 20:43 (7), 11/28/2025 16:14 (1)
Complete: 🔍
Cache ID: 216::103

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