What is the CVSS score of EUVD-2026-12439?

EUVD-2026-12439 has a CVSS 3.1 base score of 3.1 (Low). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N. EPSS exploitation probability: 0.0%.

How to fix or mitigate EUVD-2026-12439?

During next maintenance window: Apply vendor patches when convenient. Monitor vendor channels for updates.

Mattermost EUVD-2026-12439

Q: Which versions of Mattermost are affected by EUVD-2026-12439?

CVE-2026-22545 is a low-severity vulnerability (CVSS 3.1). The limited severity suggests constrained impact, typically requiring specific conditions or local access for exploitation.. A patch is available.

| CVE-2026-22545 LOW

Incorrect Authorization (CWE-863)

2026-03-16 responsibledisclosure@mattermost.com

GHSA-rv67-7w2g-7976

Authentication Bypass Mattermost Mattermost Server

3.1

CVSS 3.1 · NVD

View

Vulnerability Assessment

Weakness	CWE CWE-863 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V14 - Configuration Dependency management, component inventory MITRE ATT&CK 1 technique across 1 tactic: Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS 3.1. EPSS 0.0%. No patch confirmed.
Exploit ScenarioDerived	An attacker could exploit this vulnerability in the affected application to compromise the security of affected deployments, potentially impacting confidentiality, integrity, or availability.

Monitor Track and reassess. Why: LOW severity (CVSS 0.1-3.9).

Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 16, 2026

CVE-2026-22545 is a security vulnerability (CVSS 3.1) that allows an authenticated attacker. Remediation should follow standard vulnerability management procedures.

Earlier versions of this analysis (1)

v1 Mar 16, 2026 - 15:30 CVSS 3.1

RemediationAI

Monitor vendor channels for patch availability.

Affected VersionsENISA

Mattermost 10.11.0 ≤10.11.10

Affected Packages

go github.com/mattermost/mattermost-server fix: 5.3.2-0.20260127144908-ced9a56e3988, 10.11.11+incompatible, 10.11.11, 11.2.3+incompatible, 11.2.3, 11.3.1+incompatible, 11.3.1

go github.com/mattermost/mattermost-server/v5 no fix

go github.com/mattermost/mattermost-server/v6 no fix

go github.com/mattermost/mattermost/server/v8 fix: 8.0.0-20260127144908-ced9a56e3988

euvd mattermost no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 5 packages in go, euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

CWE-863 (Incorrect Authorization).

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 3.1 LOW

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Lifecycle Timeline

Patch released

Mar 31, 2026 - 21:13 nvd

Patch available

CVE Published

Mar 16, 2026 - 15:16 nvd

LOW 3.1

DescriptionCVE.org

Mattermost versions 10.11.x <= 10.11.10 fail to validate user's authentication method when processing account auth type switch which allows an authenticated attacker to change account password without confirmation via falsely claiming a different auth provider.. Mattermost Advisory ID: MMSA-2026-00583

Executive ViewAI

Why It Matters

CVE-2026-22545 is a low-severity vulnerability (CVSS 3.1). The limited severity suggests constrained impact, typically requiring specific conditions or local access for exploitation. Apply vendor updates when available as part of routine maintenance.

Business Impact: Low

Compensating Controls

Apply vendor patch during routine maintenance. Standard security controls provide adequate interim protection.

Threat Intelligence Overview

EPSS Score

0.0%

Top 86% exploitable

Data Quality

5 sources

Confidence: Medium

EUVD

NVD

CVE.org

EPSS

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity LOW

CISA KEV No

Public POC No

EPSS 0.0%

Patch available Yes

Active threat No

Deciding rule

LOW severity (CVSS 0.1-3.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Defer

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Human Impact

Low

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +16

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

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CVE-2026-21386 MEDIUM

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CVE-2026-24692 MEDIUM

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Same weakness CWE-863 – Incorrect Authorization

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References

Advisories & patches

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-22545 ADVISORY https://vuldb.com/?id.351279 REF https://mattermost.com/security-updates

Search Externally

GitHub PoC

Exploit-DB PacketStorm Snyk Rapid7 Nuclei Templates Trickest PoC

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