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NVD Vulnerability Details :
CVE-2026-3637
Undergoing Analysis
More InfoOfficial Page
Source-responsibledisclosure@mattermost.com
View Known Exploited Vulnerability (KEV) details
Published At-18 May, 2026 | 08:16
Updated At-18 May, 2026 | 17:32

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to check the create_post channel permission during post edit operations which allows an authenticated attacker with revoked posting privileges to modify their existing posts via direct API requests to the post update and patch endpoints.. Mattermost Advisory ID: MMSA-2026-00627

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.14.3MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Type: Secondary
Version: 3.1
Base score: 4.3
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-862Secondaryresponsibledisclosure@mattermost.com
CWE ID: CWE-862
Type: Secondary
Source: responsibledisclosure@mattermost.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://mattermost.com/security-updatesresponsibledisclosure@mattermost.com
N/A
Hyperlink: https://mattermost.com/security-updates
Source: responsibledisclosure@mattermost.com
Resource: N/A
Change History
0Changes found
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