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CVE-2026-3433

MEDIUM
4.3
CVSS 3.1
Description
Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 fail to restrict role_updated websocket event broadcasts to members of the affected team or channel which allows an authenticated attacker with guest-level access to observe permission scheme change notifications for private teams they are not a member of via the websocket connection.. Mattermost Advisory ID: MMSA-2026-00616

Metadata

CVE ID
CVE-2026-3433
State
PUBLISHED
Assigner
Mattermost
Reserved
2026-03-02 12:48 UTC
Published
2026-06-12 15:46 UTC
Last updated
2026-06-12 17:19 UTC
Primary CWE
CWE-200
CWE-200 Exposure of Sensitive Information to an Unauthorized…
Vendor / Product
Mattermost / Mattermost
Sources
cve.org  ·  NVD

Severity & Metrics

4.3 MEDIUM CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
SSVC — CISA Coordinator
Exploitation
none
Automatable
no
Tech. Impact
partial
Affected products (1)
VendorProductPlatformVersions
Mattermost Mattermost — 11.6.0 ≤ 11.6.1, 11.5.0 ≤ 11.5.4, 10.11.0 ≤ 10.11.15, 10.11.0 ≤ 10.11.16 …
Weakness (CWE)
CWESourceDescription
CWE-200 cna CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
CVSS scores (1)
ScoreSeverityVersionSourceVector
4.3 MEDIUM 3.1 cna CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
References (1)
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