Mattermost up to 10.11.6 Plugin Bot Identity improper validation of specified type of input

CVSS Meta Temp Score
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CTI Interest Score
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2.7$0-$5k0.00

Summaryinfo

A vulnerability identified as problematic has been detected in Mattermost up to 10.11.6. Affected by this issue is some unknown functionality of the component Plugin Bot Identity Handler. Performing a manipulation results in improper validation of specified type of input. This vulnerability is known as CVE-2025-13352. Remote exploitation of the attack is possible. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Mattermost up to 10.11.6. It has been classified as problematic. This affects some unknown functionality of the component Plugin Bot Identity Handler. The manipulation with an unknown input leads to a improper validation of specified type of input vulnerability. CWE is classifying the issue as CWE-1287. The product receives input that is expected to be of a certain type, but it does not validate or incorrectly validates that the input is actually of the expected type. This is going to have an impact on integrity. The summary by CVE is:

Mattermost versions 10.11.x <= 10.11.6 and Mattermost GitHub plugin versions <=2.4.0 fail to validate plugin bot identity in reaction forwarding which allows attackers to hijack the GitHub reaction feature to make users add reactions to arbitrary GitHub objects via crafted notification posts.

The weakness was published by Juho Forsén. It is possible to read the advisory at mattermost.com. This vulnerability is uniquely identified as CVE-2025-13352 since 11/18/2025. The exploitability is told to be difficult. It is possible to initiate the attack remotely. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 10.11.7 or 11.1.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-203891). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 2.8
VulDB Meta Temp Score: 2.7

VulDB Base Score: 2.6
VulDB Temp Score: 2.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 3.0
CNA Vector (Mattermost): 🔒

CVSSv2info

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

Exploitinginfo

Class: Improper validation of specified type of input
CWE: CWE-1287 / CWE-20
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Mattermost 10.11.7/11.1.0

Timelineinfo

11/18/2025 CVE reserved
12/17/2025 +29 days Advisory disclosed
12/17/2025 +0 days VulDB entry created
12/17/2025 +0 days VulDB entry last update

Sourcesinfo

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

CVE: CVE-2025-13352 (🔒)
GCVE (CVE): GCVE-0-2025-13352
GCVE (VulDB): GCVE-100-336975
EUVD: 🔒

Entryinfo

Created: 12/17/2025 13:53
Updated: 12/17/2025 15:03
Changes: 12/17/2025 13:53 (64), 12/17/2025 15:03 (1)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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