CVE-2025-13352: Github.com/mattermost/mattermost/server/v8 Mattermost GitHub Plugin Bot Identity Vulnerability
LOWCVE-2025-13352 is a LOW (CVSS 3.0) mattermost github plugin bot identity vulnerability (CWE-1287: Improper Validation of Specified Type of Input) affecting Github.com/mattermost/mattermost/server/v8 libraries in the Go ecosystem. The issue involves mattermost github plugin bot identity validation bypass allows arbitrary github reaction injection. Remediation is available by upgrading affected packages to version 10.11.7-0.20251106103514-3b05384dd014, 11.1.0, 1.0.1-0.20250829075715-0deffcfc6bee.
CVE-2025-13352 at a Glance
Security Impact
CVSS: 3.0
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:N/I:L/A:N).
How to Fix CVE-2025-13352
To remediate this vulnerability, upgrade all affected Github.com/mattermost/mattermost/server/v8 dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Upgrade github.com/mattermost/mattermost/server/v8 to 10.11.7-0.20251106103514-3b05384dd014Upgrade github.com/mattermost/mattermost to 10.11.7-0.20251106103514-3b05384dd014Upgrade github.com/mattermost/mattermost to 11.1.0Upgrade github.com/mattermost/mattermost-plugin-github to 1.0.1-0.20250829075715-0deffcfc6beeRun the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for github.com/mattermost/mattermost/server/v8How to Check if You Are Affected
To determine whether your application is affected by CVE-2025-13352, inspect your project dependencies for Github.com/mattermost/mattermost/server/v8:
inspect dependencies for github.com/mattermost/mattermost/server/v8Analyze the terminal output to locate any version of Github.com/mattermost/mattermost/server/v8 in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 10.11.7-0.20251106103514-3b05384dd014), your application is affected.
Note: Verify declared build manifests and deployed runtime container environments.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-1287: Improper Validation of Specified Type of Input, where 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. In Github.com/mattermost/mattermost/server/v8, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2025-13352 Affected Github.com/mattermost/mattermost/server/v8 Versions
4 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
github.com/mattermost/mattermost/server/v8
|
Go |
≥ 10.11.0-rc1
< 10.11.7-0.20251106103514-3b05384dd014
|
10.11.7-0.20251106103514-3b05384dd014
|
|
github.com/mattermost/mattermost
|
Go |
< 10.11.7-0.20251106103514-3b05384dd014
|
10.11.7-0.20251106103514-3b05384dd014
|
|
github.com/mattermost/mattermost
|
Go |
≥ 11.0.0-alpha.1
< 11.1.0
|
11.1.0
|
|
github.com/mattermost/mattermost-plugin-github
|
Go |
< 1.0.1-0.20250829075715-0deffcfc6bee
|
1.0.1-0.20250829075715-0deffcfc6bee
|
References
Frequently Asked Questions
What is CVE-2025-13352?
Which Github.com/mattermost/mattermost/server/v8 versions are affected?
What version fixes CVE-2025-13352?
Is github.com/mattermost/mattermost/server/v8 affected?
Is github.com/mattermost/mattermost affected?
What is the CVSS score of CVE-2025-13352?
What CWE is associated with CVE-2025-13352?
How can I check Go dependencies for CVE-2025-13352?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-jf5h-xfw4-p8gp",
"modified" : "2025-12-17T22:49:46Z",
"published" : "2025-12-17T15:34:53Z",
"aliases" : [ "CVE-2025-13352" ],
"summary" : "Mattermost GitHub Plugin Bot Identity Validation Bypass Allows Arbitrary GitHub Reaction Injection",
"details" : "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.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:N/I:L/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/mattermost/mattermost/server/v8"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "10.11.0-rc1"
}, {
"fixed" : "10.11.7-0.20251106103514-3b05384dd014"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/mattermost/mattermost"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "10.11.7-0.20251106103514-3b05384dd014"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/mattermost/mattermost"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "11.0.0-alpha.1"
}, {
"fixed" : "11.1.0"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/mattermost/mattermost-plugin-github"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "1.0.1-0.20250829075715-0deffcfc6bee"
} ]
} ]
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-13352"
}, {
"type" : "WEB",
"url" : "https://github.com/mattermost/mattermost-plugin-github/commit/0deffcfc6bee7eaf01f7c99100e3d12e8d9df68c"
}, {
"type" : "WEB",
"url" : "https://github.com/mattermost/mattermost/commit/3b05384dd0146c1be3caa620a42e00e46027055d"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/mattermost/mattermost"
}, {
"type" : "WEB",
"url" : "https://mattermost.com/security-updates"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-1287" ],
"severity" : "LOW",
"github_reviewed" : true,
"github_reviewed_at" : "2025-12-17T22:49:46Z",
"nvd_published_at" : "2025-12-17T13:15:56Z"
}
}