CVE-2025-49810: Github.com/mattermost/mattermost server Mattermost Lack Of Access Control Vulnerability

LOW
Advisory Identifier: GHSA-pwvr-grqg-7vp2
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CVSS 3.5
CWE-863
Published
Advisory Summary

CVE-2025-49810 is a LOW (CVSS 3.5) mattermost lack of access control vulnerability (CWE-863: Incorrect Authorization) affecting Github.com/mattermost/mattermost server libraries in the Go ecosystem. The issue involves mattermost lack of access control validation. Remediation is available by upgrading affected packages to version 10.5.9, 8.0.0-20250721095846-c602a4a78e1f.

CVE-2025-49810 at a Glance

CVE Identifier CVE-2025-49810
GHSA Identifier GHSA-pwvr-grqg-7vp2
Severity LOW
CVSS v3.1 Base Score 3.5
CWE Classification CWE-863: Incorrect Authorization
Affected Product Github.com/mattermost/mattermost server
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 3.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction Required (UI:R)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2025-49810

To remediate this vulnerability, upgrade all affected Github.com/mattermost/mattermost server dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/mattermost/mattermost-server fixed: 10.5.9 
Upgrade github.com/mattermost/mattermost-server to 10.5.9
github.com/mattermost/mattermost/server/v8 fixed: 8.0.0-20250721095846-c602a4a78e1f 
Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20250721095846-c602a4a78e1f
Verify Direct and Transitive Dependencies

Run 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

How to Check if You Are Affected

To determine whether your application is affected by CVE-2025-49810, inspect your project dependencies for Github.com/mattermost/mattermost server:

inspect dependencies for github.com/mattermost/mattermost-server

Analyze the terminal output to locate any version of Github.com/mattermost/mattermost server in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 10.5.9), 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-863: Incorrect Authorization, where 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. In Github.com/mattermost/mattermost server, 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

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

CVE-2025-49810 Affected Github.com/mattermost/mattermost server Versions

2 component(s)
Fixed Versions:
10.5.98.0.0-20250721095846-c602a4a78e1f
Product / Package Ecosystem Affected Versions Fixed Version
github.com/mattermost/mattermost-server
golang/github.com/mattermost/mattermost-server
Go
≥ 10.5.0
< 10.5.9
10.5.9
github.com/mattermost/mattermost/server/v8
golang/github.com/mattermost/mattermost/server/v8
Go
< 8.0.0-20250721095846-c602a4a78e1f
8.0.0-20250721095846-c602a4a78e1f

References

NVD — CVE-2025-49810 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-49810
Github.com/mattermost/mattermost server Source Repository REPOSITORY
https://github.com/mattermost/mattermost
Github.com/mattermost/mattermost server Security Information SECURITY
https://mattermost.com/security-updates
pkg.go.dev/vuln/go-2025-3903 WEB
https://pkg.go.dev/vuln/GO-2025-3903

Frequently Asked Questions

What is CVE-2025-49810?
CVE-2025-49810 is a security vulnerability in Github.com/mattermost/mattermost server involving Mattermost Lack of Access Control Validation under CWE-863: Incorrect Authorization.
Which Github.com/mattermost/mattermost server versions are affected?
Affected versions include releases prior to 10.5.9, 8.0.0-20250721095846-c602a4a78e1f across affected packages: github.com/mattermost/mattermost-server, github.com/mattermost/mattermost/server/v8.
What version fixes CVE-2025-49810?
Upgrading to 10.5.9, 8.0.0-20250721095846-c602a4a78e1f (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/mattermost/mattermost-server affected?
Yes, github.com/mattermost/mattermost-server is affected in releases prior to 10.5.9. Upgrade your dependency to 10.5.9 or later.
Is github.com/mattermost/mattermost/server/v8 affected?
Yes, github.com/mattermost/mattermost/server/v8 is affected in releases prior to 8.0.0-20250721095846-c602a4a78e1f. Upgrade your dependency to 8.0.0-20250721095846-c602a4a78e1f or later.
What is the CVSS score of CVE-2025-49810?
CVE-2025-49810 has a CVSS v3.1 base score of 3.5 (LOW) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2025-49810?
CVE-2025-49810 is classified under CWE-863: Incorrect Authorization (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.).
How can I check Go dependencies for CVE-2025-49810?
Run the dependency tree command: 'inspect dependencies for github.com/mattermost/mattermost-server'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-pwvr-grqg-7vp2",
  "modified" : "2025-08-29T20:55:49Z",
  "published" : "2025-08-21T09:30:21Z",
  "aliases" : [ "CVE-2025-49810" ],
  "summary" : "Mattermost Lack of Access Control Validation",
  "details" : "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",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/mattermost/mattermost-server"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "10.5.0"
      }, {
        "fixed" : "10.5.9"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 10.5.8"
    }
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/mattermost/mattermost/server/v8"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "8.0.0-20250721095846-c602a4a78e1f"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-49810"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/mattermost/mattermost"
  }, {
    "type" : "WEB",
    "url" : "https://mattermost.com/security-updates"
  }, {
    "type" : "WEB",
    "url" : "https://pkg.go.dev/vuln/GO-2025-3903"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-863" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-08-21T16:02:54Z",
    "nvd_published_at" : "2025-08-21T08:15:30Z"
  }
}