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CVE-2026-6343— Mattermost Playbooks Plugin fails to enforce view permissions in list endpoints, allowing unauthorized access to public playbooks

CVSS 4.3 · Medium

Affected Version Matrix 7

VendorProductVersion RangeStatus
MattermostMattermost11.5.0≤ 11.5.1affected
10.11.0≤ 10.11.13affected
11.4.0≤ 11.4.3affected
11.6.0unaffected
11.5.2unaffected
10.11.14unaffected
11.4.4unaffected
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I. Basic Information for CVE-2026-6343

Vulnerability Information
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Vulnerability Title
Mattermost Playbooks Plugin fails to enforce view permissions in list endpoints, allowing unauthorized access to public playbooks
Source: NVD (National Vulnerability Database)
Vulnerability Description
Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to check public/private permissions which allows members without these permissions to access public playbooks via /get.. Mattermost Advisory ID: MMSA-2026-00591
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
授权机制不正确
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
MattermostMattermost 11.5.0 ~ 11.5.1 -

II. Public POCs for CVE-2026-6343

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III. Intelligence Information for CVE-2026-6343

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Same Patch Batch · Mattermost · 2026-05-18 · 21 CVEs total

CVE-2026-63468.7 HIGHSensitive credentials exposed in plaintext in Mattermost support packets
CVE-2026-63477.6 HIGHMattermost Calls plugin exposes TURN server credentials in plaintext in support packets
CVE-2026-34716.5 MEDIUMOpening a window with {{javascript:alert()}} as URL causes crash in the Mattermost Desktop
CVE-2026-31176.5 MEDIUMInstance and webhook GitLab plugin commands were able to be run by non-admin users
CVE-2026-51636.5 MEDIUMMissing authorization check in AI message rewrite endpoint allows access to private thread
CVE-2026-63456.5 MEDIUMPrevent password disclosure and force reset during Slack import
CVE-2026-287324.3 MEDIUMSlash command trigger-word update allowed command hijacking
CVE-2026-287594.3 MEDIUMInsufficient authorization in shared channel membership sync allows remote cluster to remo
CVE-2026-23254.3 MEDIUMImproper Input Validation in MS Teams Meetings API Handler
CVE-2026-63394.3 MEDIUMMissing request origin validation on burn-on-read reveal endpoint
CVE-2026-63404.3 MEDIUMMemory Exhaustion via Malicious 7zip File Upload
CVE-2026-63414.3 MEDIUMIncomplete group locking implementation
CVE-2026-63424.3 MEDIUMGroup prefix matching bypass for subscriptions
CVE-2026-36374.3 MEDIUMMattermost fails to enforce create_post permission when editing posts
CVE-2026-34953.8 LOWUnescaped variables during error page composition
CVE-2026-42733.7 LOWInsufficient token rotation validation in remote cluster invite confirmation
CVE-2026-46433.5 LOWCalling window.close() from server-side content causes crash in the Mattermost Desktop App
CVE-2026-63333.5 LOWSSRF via Host Header Spoofing in Custom Slash Commands
CVE-2026-42863.1 LOWPlaybooks Plugin fails to validate team transfers, allowing unauthorized removal of member
CVE-2026-63343.1 LOWOAuth authorization code client binding not enforced during token redemption in Mattermost

IV. Related Vulnerabilities

Same product: Mattermost
Same vendor: Mattermost
Same weakness: CWE-863

V. Comments for CVE-2026-6343

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