Mattermost Desktop App up to 5.x on macOS protection mechanism

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.
4.5$0-$5k0.00

Summaryinfo

A vulnerability labeled as problematic has been found in Mattermost Desktop App up to 5.x on macOS. This vulnerability affects unknown code. The manipulation results in protection mechanism. This vulnerability is reported as CVE-2025-13326. The attack requires a local approach. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as problematic has been found in Mattermost Desktop App up to 5.x on macOS. Affected is an unknown part. The manipulation with an unknown input leads to a protection mechanism vulnerability. CWE is classifying the issue as CWE-693. The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Mattermost Desktop App versions <6.0.0 fail to enable the Hardened Runtime on the Mattermost Desktop App when packaged for Mac App Store which allows an attacker to inherit TCC permissions via copying the binary to a tmp folder.

The weakness was disclosed by Karmaz95. The advisory is shared for download at mattermost.com. This vulnerability is traded as CVE-2025-13326 since 11/17/2025. The exploitability is told to be easy. The attack needs to be approached locally. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 282319 (Mattermost Desktop < 6.0.0 (macOS) (MMSA-2025-00504)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.0.0 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (282319) and CERT Bund (WID-SEC-2025-2880). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • Mattermost Mattermost

Productinfo

Type

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.6
VulDB Meta Temp Score: 4.5

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 3.9
CNA Vector (Mattermost): 🔒

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

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

Exploitinginfo

Class: Protection mechanism
CWE: CWE-693
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 282319
Nessus Name: Mattermost Desktop < 6.0.0 (macOS) (MMSA-2025-00504)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Desktop App 6.0.0

Timelineinfo

11/17/2025 CVE reserved
12/17/2025 +30 days Advisory disclosed
12/17/2025 +0 days VulDB entry created
02/27/2026 +72 days VulDB entry last update

Sourcesinfo

Advisory: mattermost.com
Researcher: Karmaz95
Status: Confirmed

CVE: CVE-2025-13326 (🔒)
GCVE (CVE): GCVE-0-2025-13326
GCVE (VulDB): GCVE-100-337032
CERT Bund: WID-SEC-2025-2880 - Mattermost Server und Desktop: Mehrere Schwachstellen

Entryinfo

Created: 12/17/2025 21:31
Updated: 02/27/2026 13:59
Changes: 12/17/2025 21:31 (65), 12/18/2025 18:02 (7), 01/07/2026 21:55 (2), 02/27/2026 13:59 (1)
Complete: 🔍
Cache ID: 216::103

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

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Do you want to use VulDB in your project?

Use the official API to access entries easily!