VDB-300580 · CVE-2025-27715 · Nessus 233451

Mattermost up to 9.11.8/10.4.x Permalink 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.
3.6	$0-$5k	0.00

Summaryinfo

A vulnerability classified as problematic was found in Mattermost up to 9.11.8/10.4.x. Impacted is an unknown function of the component Permalink Handler. Executing a manipulation can lead to authorization. This vulnerability is registered as CVE-2025-27715. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Mattermost up to 9.11.8/10.4.x. It has been declared as problematic. This vulnerability affects an unknown function of the component Permalink Handler. The manipulation with an unknown input leads to a authorization vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Mattermost versions 9.11.x <= 9.11.8 fail to prompt for explicit approval before adding a team admin to a private channel, which team admins to joining private channels via crafted permalink links without explicit consent from them.

The weakness was published by Joram Wilander. The advisory is shared for download at mattermost.com. This vulnerability was named CVE-2025-27715 since 03/20/2025. The exploitation appears to be difficult. The attack can be initiated remotely. The exploitation requires an enhanced level of successful authentication. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 233451 (Mattermost Server 9.11.x < 9.11.9 (MMSA-2024-00409)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 9.11.9 or 10.5.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (233451). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Groupware Software

Name

Mattermost

Version

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.7
VulDB Meta Temp Score: 3.6

VulDB Base Score: 4.1
VulDB Temp Score: 3.9
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 3.3
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: 233451
Nessus Name: Mattermost Server 9.11.x < 9.11.9 (MMSA-2024-00409)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Mattermost 9.11.9/10.5.0

Timelineinfo

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

Sourcesinfo

Advisory: mattermost.com
Researcher: Joram Wilander
Status: Confirmed

CVE: CVE-2025-27715 (🔍)
GCVE (CVE): GCVE-0-2025-27715
GCVE (VulDB): GCVE-100-300580

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: 216:424:103