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CVE-2026-3472

Markdown image rendering bypass in AI bot tool result posts in Mattermost

Published: Jun 26, 2026Updated: Jun 29, 2026 Sources: CVE List NVDCWE-693
3.5LOW
NVD MITRE
EPSS Score
0.2%
Top 90.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

Mattermost versions 10.11.x <= 10.11.18, 11.6.x <= 11.6.3, 11.5.x <= 11.5.6 fail to properly apply markdown image rendering restrictions to AI bot tool result posts, which allows an authenticated attacker to exfiltrate data to an attacker-controlled server via injecting markdown image syntax into tool result content rendered by a victim's client.. Mattermost Advisory ID: MMSA-2026-00619

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:RS:UC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-693

Affected Products

Mattermost
commercial·US
mattermost serverOn-premWeb App
Communications / messaging-chat
MattermostOn-premWeb App
Communications / messaging-chat

Exploitability

Official Patch Available
Is your org exposed to CVE-2026-3472?We can run the check for you — a free external exposure review, no install. Check my exposure

References

https://mattermost.com/security-updates
mattermost.com

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