CVE-2025-35965: Github.com/mattermost/mattermost/server/v8 Mattermost Playbooks Fails To Validate Vulnerability

MODERATE
Advisory Identifier: GHSA-689c-xq7x-xjwf
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CVSS 6.5
CWE-770
Published
Advisory Summary

CVE-2025-35965 is a MODERATE (CVSS 6.5) mattermost playbooks fails to validate vulnerability (CWE-770: Allocation of Resources Without Limits or Throttling) affecting Github.com/mattermost/mattermost/server/v8 libraries in the Go ecosystem. The issue involves mattermost playbooks fails to validate the uniqueness and quantity of task actions. Remediation is available by upgrading affected packages to version 8.0.0-20250218121836-2b5275d87136, 1.41.0.

CVE-2025-35965 at a Glance

CVE Identifier CVE-2025-35965
GHSA Identifier GHSA-689c-xq7x-xjwf
Severity MODERATE
CVSS v3.1 Base Score 6.5
CWE Classification CWE-770: Allocation of Resources Without Limits or Throttling
Affected Product Github.com/mattermost/mattermost/server/v8
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 6.5

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:N/S:U/C:N/I:N/A:H).

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

How to Fix CVE-2025-35965

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.

github.com/mattermost/mattermost/server/v8 fixed: 8.0.0-20250218121836-2b5275d87136 
Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20250218121836-2b5275d87136
github.com/mattermost/mattermost-plugin-playbooks fixed: Latest secure release 
Upgrade github.com/mattermost/mattermost-plugin-playbooks to Latest secure release
github.com/mattermost/mattermost/server/v8 fixed: Latest secure release 
Upgrade github.com/mattermost/mattermost/server/v8 to Latest secure release
github.com/mattermost/mattermost/server/v8 fixed: Latest secure release 
Upgrade github.com/mattermost/mattermost/server/v8 to Latest secure release
github.com/mattermost/mattermost/server/v8 fixed: Latest secure release 
Upgrade github.com/mattermost/mattermost/server/v8 to Latest secure release
github.com/mattermost/mattermost-plugin-playbooks fixed: 1.41.0 
Upgrade github.com/mattermost/mattermost-plugin-playbooks to 1.41.0
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/v8

How to Check if You Are Affected

To determine whether your application is affected by CVE-2025-35965, inspect your project dependencies for Github.com/mattermost/mattermost/server/v8:

inspect dependencies for github.com/mattermost/mattermost/server/v8

Analyze 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 8.0.0-20250218121836-2b5275d87136), 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-770: Allocation of Resources Without Limits or Throttling, where the product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated. 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

Mattermost versions 10.4.x <= 10.4.2, 10.5.x <= 10.5.0, 9.11.x <= 9.11.10 fail to validate the uniqueness and quantity of task actions within the UpdateRunTaskActions GraphQL operation, which allows an attacker to create task items containing an excessive number of actions triggered by specific posts, overloading the server and leading to a denial-of-service (DoS) condition.

CVE-2025-35965 Affected Github.com/mattermost/mattermost/server/v8 Versions

6 component(s)
Fixed Versions:
8.0.0-20250218121836-2b5275d871361.41.0
Product / Package Ecosystem Affected Versions Fixed Version
github.com/mattermost/mattermost/server/v8
golang/github.com/mattermost/mattermost/server/v8
Go
< 8.0.0-20250218121836-2b5275d87136
8.0.0-20250218121836-2b5275d87136
github.com/mattermost/mattermost-plugin-playbooks
golang/github.com/mattermost/mattermost-plugin-playbooks
Go
≥ 2.0.0
github.com/mattermost/mattermost/server/v8
golang/github.com/mattermost/mattermost/server/v8
Go
≥ 10.4.0
github.com/mattermost/mattermost/server/v8
golang/github.com/mattermost/mattermost/server/v8
Go
≥ 10.5.0
github.com/mattermost/mattermost/server/v8
golang/github.com/mattermost/mattermost/server/v8
Go
≥ 9.11.0
github.com/mattermost/mattermost-plugin-playbooks
golang/github.com/mattermost/mattermost-plugin-playbooks
Go
< 1.41.0
1.41.0

References

NVD — CVE-2025-35965 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-35965
Security Fix Commit FIX COMMIT
https://github.com/mattermost/mattermost-plugin-playbooks/commit/bf2633dad09f5768ce2bea4b7c5ffb74050052a8
Security Fix Commit FIX COMMIT
https://github.com/mattermost/mattermost/commit/2b5275d87136f07e016c8eca09a2f004b31afc8a
Github.com/mattermost/mattermost/server/v8 Source Repository REPOSITORY
https://github.com/mattermost/mattermost-plugin-playbooks
Github.com/mattermost/mattermost/server/v8 Security Information SECURITY
https://mattermost.com/security-updates

Frequently Asked Questions

What is CVE-2025-35965?
CVE-2025-35965 is a security vulnerability in Github.com/mattermost/mattermost/server/v8 involving Mattermost Playbooks fails to validate the uniqueness and quantity of task actions under CWE-770: Allocation of Resources Without Limits or Throttling.
Which Github.com/mattermost/mattermost/server/v8 versions are affected?
Affected versions include releases prior to 8.0.0-20250218121836-2b5275d87136, 1.41.0 across affected packages: github.com/mattermost/mattermost/server/v8, github.com/mattermost/mattermost-plugin-playbooks.
What version fixes CVE-2025-35965?
Upgrading to 8.0.0-20250218121836-2b5275d87136, 1.41.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/mattermost/mattermost/server/v8 affected?
Yes, github.com/mattermost/mattermost/server/v8 is affected in releases prior to 8.0.0-20250218121836-2b5275d87136, Latest secure release. Upgrade your dependency to 8.0.0-20250218121836-2b5275d87136, Latest secure release or later.
Is github.com/mattermost/mattermost-plugin-playbooks affected?
Yes, github.com/mattermost/mattermost-plugin-playbooks is affected in releases prior to Latest secure release, 1.41.0. Upgrade your dependency to Latest secure release, 1.41.0 or later.
What is the CVSS score of CVE-2025-35965?
CVE-2025-35965 has a CVSS v3.1 base score of 6.5 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2025-35965?
CVE-2025-35965 is classified under CWE-770: Allocation of Resources Without Limits or Throttling (The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.).
How can I check Go dependencies for CVE-2025-35965?
Run the dependency tree command: 'inspect dependencies for github.com/mattermost/mattermost/server/v8'. 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-689c-xq7x-xjwf",
  "modified" : "2025-04-24T16:09:19Z",
  "published" : "2025-04-24T09:30:33Z",
  "aliases" : [ "CVE-2025-35965" ],
  "summary" : "Mattermost Playbooks fails to validate the uniqueness and quantity of task actions",
  "details" : "Mattermost versions 10.4.x <= 10.4.2, 10.5.x <= 10.5.0, 9.11.x <= 9.11.10 fail to validate the uniqueness and quantity of task actions within the UpdateRunTaskActions GraphQL operation, which allows an attacker to create task items containing an excessive number of actions triggered by specific posts, overloading the server and leading to a denial-of-service (DoS) condition.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/mattermost/mattermost/server/v8"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "8.0.0-20250218121836-2b5275d87136"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/mattermost/mattermost-plugin-playbooks"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.0.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "< 2.1.1"
    }
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/mattermost/mattermost/server/v8"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "10.4.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "< 10.4.3"
    }
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/mattermost/mattermost/server/v8"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "10.5.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "< 10.5.1"
    }
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/mattermost/mattermost/server/v8"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "9.11.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "< 9.11.11"
    }
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/mattermost/mattermost-plugin-playbooks"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.41.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-35965"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mattermost/mattermost-plugin-playbooks/commit/bf2633dad09f5768ce2bea4b7c5ffb74050052a8"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mattermost/mattermost/commit/2b5275d87136f07e016c8eca09a2f004b31afc8a"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/mattermost/mattermost-plugin-playbooks"
  }, {
    "type" : "WEB",
    "url" : "https://mattermost.com/security-updates"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-770" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-04-24T16:09:18Z",
    "nvd_published_at" : "2025-04-24T07:15:31Z"
  }
}