Mattermost up to 10.5.8 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 (≈)
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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.
3.4$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in Mattermost up to 10.5.8. Affected is an unknown function. Such manipulation leads to authorization. This vulnerability is traded as CVE-2025-49810. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Mattermost up to 10.5.8. Affected by this issue is some unknown functionality. 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. CVE summarizes:

Mattermost versions 10.5.x <= 10.5.8 fail to validate access controls at time of access which allows user to read a thread via AI posts

The weakness was shared by Juho Forsén. The advisory is shared for download at mattermost.com. This vulnerability is handled as CVE-2025-49810 since 07/22/2025. The exploitation is known to be easy. The attack may be launched remotely. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 264625 (Mattermost Server 10.5.x < 10.5.9 / 10.10.0 Incorrect Authorization (MMSA-2025-00470)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 10.5.9 or 10.10.0 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (264625) and CERT Bund (WID-SEC-2025-1625). Once again VulDB remains the best source for vulnerability data.

Affected

  • Mattermost Mattermost

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.5
VulDB Meta Temp Score: 3.4

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 3.5
CNA Vector (Mattermost): 🔒

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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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-DayUnlockUnlockUnlockUnlock
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Nessus ID: 264625
Nessus Name: Mattermost Server 10.5.x < 10.5.9 / 10.10.0 Incorrect Authorization (MMSA-2025-00470)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Mattermost 10.5.9/10.10.0

Timelineinfo

07/22/2025 CVE reserved
08/21/2025 +30 days Advisory disclosed
08/21/2025 +0 days VulDB entry created
09/13/2025 +23 days VulDB entry last update

Sourcesinfo

Advisory: mattermost.com
Researcher: Juho Forsén
Status: Confirmed

CVE: CVE-2025-49810 (🔒)
GCVE (CVE): GCVE-0-2025-49810
GCVE (VulDB): GCVE-100-320924
CERT Bund: WID-SEC-2025-1625 - Mattermost Server und Plugins: Mehrere Schwachstellen

Entryinfo

Created: 08/21/2025 11:43
Updated: 09/13/2025 11:39
Changes: 08/21/2025 11:43 (63), 08/21/2025 13:14 (7), 08/21/2025 14:29 (1), 09/13/2025 11:39 (2)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

Discussion

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