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CVE-2026-16048— Channel member roles accept out-of-scope roles

CVSS 6.3 · Medium EPSS 0.15% · P5

Affected Version Matrix 7

VendorProductVersion RangeStatus
MattermostMattermost11.8.0≤ 11.8.2affected
11.7.0≤ 11.7.6affected
10.11.0≤ 10.11.21affected
11.9.0unaffected
11.8.3unaffected
11.7.7unaffected
10.11.22unaffected
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I. Basic Information for CVE-2026-16048

Vulnerability Information
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Vulnerability Title
Channel member roles accept out-of-scope roles
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost versions 11.8.x <= 11.8.2, 11.7.x <= 11.7.6, 10.11.x <= 10.11.21 fail to restrict channel member role assignment to channel-scoped roles which allows a channel administrator to gain additional channel permissions via the channel member roles API.. Mattermost Advisory ID: MMSA-2026-00697
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Mattermost 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mattermost是美国Mattermost公司开源的一个开源协作平台。 Mattermost 11.8.2及之前的11.8.x版本、11.7.6及之前的11.7.x版本和10.11.21及之前的10.11.x版本存在授权问题漏洞，该漏洞源于未将频道成员角色分配限制为频道范围角色，可能导致频道管理员通过频道成员角色API获得额外的频道权限。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
MattermostMattermost 11.8.0 ~ 11.8.2 -

II. Public POCs for CVE-2026-16048

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III. Intelligence Information for CVE-2026-16048

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Same Patch Batch · Mattermost · 2026-08-17 · 13 CVEs total

CVE-2026-98168.3 HIGHInsufficient server-side validation of board member role fields permits privilege escalati
CVE-2026-98596.5 MEDIUMMattermost Boards plugin didn’t enforce role-based authorization on board channel link all
CVE-2026-100806.5 MEDIUMBoards plugin panics on WebSocket command with non-string field types
CVE-2026-105276.3 MEDIUMBoards plugin retains Board Admin rights for users demoted to System Guest
CVE-2026-160474.3 MEDIUMBoard channel linking without read channel permission validation
CVE-2026-157544.2 MEDIUMMissing per-channel team-scope check in ABAC access control policy unassign allows cross-t
CVE-2026-160443.9 LOWInsufficient validation of guest board admin privileges on archive import
CVE-2026-160493.9 LOW_GitLab Plugin allows cross-channel post injection and phishing via missing channel permis
CVE-2026-755873.6 LOWPlaintext pre-auth secret exposure via Desktop App diagnostics report
CVE-2026-96933.5 LOWMattermost thread memberships persist after team removal, exposing private channel thread
CVE-2026-160463.5 LOWMissing run-state validation on finished playbook runs
CVE-2026-160452.7 LOWDelegated OAuth tokens could revoke unrelated OAuth application authorizations

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-16048

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