What is the CVSS score of CVE-2026-2457?

CVE-2026-2457 has a CVSS 3.1 base score of 4.3 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N. EPSS exploitation probability: 0.0%.

Which versions of Mattermost are affected by CVE-2026-2457?

CVE-2026-2457 presents moderate security risk rated CVSS 4.3. Exploitation could compromise the security of affected deployments.. A patch is available.

Mattermost CVE-2026-2457

Q: How to fix or mitigate CVE-2026-2457?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

EUVD-2026-12407 MEDIUM

Origin Validation Error (CWE-346)

2026-03-16 Mattermost

GHSA-ph22-fw5m-w2q9

Information Disclosure Mattermost Suse

4.3

CVSS 3.1

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Lifecycle Timeline

Patch released

Mar 31, 2026 - 21:13 nvd

Patch available

EUVD ID Assigned

Mar 16, 2026 - 12:00 euvd

EUVD-2026-12407

Analysis Generated

Mar 16, 2026 - 12:00 vuln.today

CVE Published

Mar 16, 2026 - 11:20 nvd

MEDIUM 4.3

DescriptionNVD

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to sanitize client-supplied post metadata which allows an authenticated attacker to spoof permalink embeds impersonating other users via crafted PUT requests to the post update API endpoint.. Mattermost Advisory ID: MMSA-2025-00569

AnalysisAI

Mattermost fails to properly sanitize client-supplied post metadata in its post update API endpoint, allowing authenticated attackers to spoof permalink embeds and impersonate other users through crafted PUT requests. The vulnerability affects Mattermost versions 11.3.0 and earlier, 11.2.2 and earlier, and 10.11.10 and earlier. …

RemediationAI

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Analysis

Detailed AI-generated intelligence summary covering attack vector, impact assessment, affected versions, remediation steps, and indicators of compromise.

POChttps://••••••••••.com/exploit

PATCHhttps://••••••••••.com/patch

ADVISORYhttps://••••••••••.com/advisory

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CVE-2026-2457 vulnerability details – vuln.today

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Mattermost CVE-2026-2457

CVSS VectorNVD

Lifecycle Timeline

DescriptionNVD

AnalysisAI

RemediationAI

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External POC / Exploit Code