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» GHSA-ffpr-pfr4-g354
Description
Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to sanitize team member data when returned via API to users without elevated permissions which allows a user without permissions to get data about team members roles via invoking various team API endpoints.. Mattermost Advisory ID: MMSA-2026-00626
Basic information
Type
unreviewed
Severity
medium Advisory on GitHub
Open advisory ↗ Repository advisory
—
Source code
Not specified Published (advisory)
2026-05-26 13:30:15 UTC
Updated
2026-05-26 13:30:16 UTC
NVD published
2026-05-22 11:16:22 UTC
EPSS Score
Score
Percentile
0.03%
8.02%
CVSS Scores
Base score
Version
Severity
Vector
4.3
3.1
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CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
CWEs
CWE id
Name
CWE-200
Exposure of Sensitive Information to an Unauthorized Actor
cvelogic
Threat Intelligence