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NVD / CVE Program· CNA Mattermost

CVE-2025-13870: Unauthorized access and subscription vulnerability in Boards

Noroxi assessment

Priority: Monitor (action score 17/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.23% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: github.com/mattermost/mattermost (Go) 10.11.5, 10.11.5+incompatible, 10.5.13; github.com/mattermost/mattermost/server/v8 (Go) 8.0.0-20250905150616-ba86dfc5876b, 8.0.0-20251212204551-54f2e9b4afd5; govulncheck-vulndb (openSUSE:Leap 15.6) 0.0.20251209T172047-150000.1.127.1.

Low priority for now. Upgrade to github.com/mattermost/mattermost (Go) 10.11.5, 10.11.5+incompatible, 10.5.13; github.com/mattermost/mattermost/server/v8 (Go) 8.0.0-20250905150616-ba86dfc5876b, 8.0.0-20251212204551-54f2e9b4afd5; govulncheck-vulndb (openSUSE:Leap 15.6) 0.0.20251209T172047-150000.1.127.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Mattermost versions 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to validate the user permission when accessing the files and subscribing to the block in Boards, which allows an authenticated user to access other board files and was able to subscribe to the block from other boards that the user does not have access to

MediumCVSS 4.3 · v3.1—No exploit Fix available
Published
Dec 2, 2025
Updated
Oct 18, 2026
EPSS
0.2% · 15th percentile

Report tools

JSON

Action score

17

Monitor

Low priority for now.

CVSS
17 / 40 · 4.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
4.3
CNA · Mattermost
3.1
1.2 point gap

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2025-13870

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
mattermostmattermost server

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • mattermost mattermost server10.5.0 and later · before 10.5.13
  • mattermost mattermost server10.11.0 and later · before 10.11.5

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Mattermost). Independent of NVD's CPE analysis and usually ahead of it.

  • Mattermost Mattermost

    • 11.1.0, 10.11.5, 10.5.13not affected
    • 10.11.0 and later · up to and including 10.11.4affected · semver
    • 10.5.0 and later · up to and including 10.5.12affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Gogithub.com/mattermost/mattermostfrom 10.11.0 · before 10.11.510.11.5
Gogithub.com/mattermost/mattermostfrom 10.11.0+incompatible · before 10.11.5+incompatible10.11.5+incompatible
Gogithub.com/mattermost/mattermostfrom 10.5.0 · before 10.5.1310.5.13
Gogithub.com/mattermost/mattermostfrom 10.5.0+incompatible · before 10.5.13+incompatible10.5.13+incompatible
Gogithub.com/mattermost/mattermost-serverfrom 0—
Gogithub.com/mattermost/mattermost-server/v5from 0—
Gogithub.com/mattermost/mattermost-server/v6from 0—
Gogithub.com/mattermost/mattermost/server/v8before 8.0.0-20250905150616-ba86dfc5876b8.0.0-20250905150616-ba86dfc5876b
Gogithub.com/mattermost/mattermost/server/v8before 8.0.0-20251212204551-54f2e9b4afd58.0.0-20251212204551-54f2e9b4afd5
openSUSE:Leap 15.6govulncheck-vulndbbefore 0.0.20251209T172047-150000.1.127.10.0.20251209T172047-150000.1.127.1
SUSE:Linux Enterprise Module for Package Hub 15 SP6govulncheck-vulndbbefore 0.0.20251209T172047-150000.1.127.10.0.20251209T172047-150000.1.127.1

Same product

mattermost: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-4858Path traversal in integration action URL leading to arbitrary API execution via system admin’s auth token.
    39Monitor
  • CVE-2025-12421Account Takeover via Code Exchange Endpoint
    39Monitor
  • CVE-2025-12419Account takeover on OAuth/OpenID-enabled servers
    39Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2025-12559Nov 27, 2025 · Information Disclosure in Common Teams API
    17Monitor
  • ← EarlierCVE-2025-12756Dec 1, 2025 · Insecure Direct Object Reference in Mattermost Boards Plugin Enables Unauthorised Comment Deletion
    17Monitor
  • Later →CVE-2025-13352Dec 17, 2025 · Mattermost GitHub Plugin allows unauthorized GitHub reactions via reaction forwarding hijacking
    12Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Go:github.com/mattermost/mattermost10.11.5Package registry (OSV)
Go:github.com/mattermost/mattermost10.11.5+incompatiblePackage registry (OSV)
Go:github.com/mattermost/mattermost10.5.13Package registry (OSV)
Go:github.com/mattermost/mattermost10.5.13+incompatiblePackage registry (OSV)
Go:github.com/mattermost/mattermost/server/v88.0.0-20250905150616-ba86dfc5876bPackage registry (OSV)
Go:github.com/mattermost/mattermost/server/v88.0.0-20251212204551-54f2e9b4afd5Package registry (OSV)
opensuse:govulncheck-vulndb0.0.20251209T172047-150000.1.127.1 · openSUSE:Leap 15.6Package registry (OSV)
suse:govulncheck-vulndb0.0.20251209T172047-150000.1.127.1 · SUSE:Linux Enterprise Module for Package Hub 15 SP6Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2025-25068256 days apartBypassing MFA Enforcement on Plugin Endpoints
    35Monitor
  • CVE-2025-5507018 days apartLack of MFA enforcement in WebSocket connections
    30Monitor
  • CVE-2025-6226137 days apartIDOR in CreatePost API allows for timeboxed message disclosure
    26Monitor
  • CVE-2026-6673202 days apartMattermost Jira plugin had unauthenticated {{/ac/installed}} lifecycle callback during pending Jira Cloud install
    25Monitor
  • CVE-2025-5507318 days apartMS Teams plugin OAuth allows editing arbitrary posts
    21Monitor
  • CVE-2025-47870103 days apartTeam invite ID leaked to team admin with no member invite privileges
    17Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

  • CVE-2025-907974 days apartAdmin RCE via prepackaged plugins by way of misconfigured imports directory
    28Monitor
  • CVE-2025-8023103 days apartPath Traversal in Template Upload Allows Uploading Files Outside Target Directory
    19Monitor
  • CVE-2025-36530103 days apartImport Path Traversal Enables Unauthorized Unsigned Plugin Installation
    19Monitor
  • CVE-2025-6465103 days apartPath traversal in image upload with preview overwrite
    17Monitor

Bug bounty scope

The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-306 · Missing Authentication for Critical Function

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

nvd-primary

Root cause

A function added for development or support ships to production without authentication. It often relies on the assumption that it is “only reachable from the internal network.”

The bug in code

The whole CWE-306 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
// Added for the support teamapp.post("/maintenance/reset", resetDevice);

Fixed

ts
if (config.maintenanceEnabled) {  app.post(    "/maintenance/reset",    requireSession, requireRole("admin"), resetDevice  );}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records