CVE-2026-9693Disclosure(mattermost / mattermost_server)

LOWCVSS 3.5 · LOW

Signal is active with 2 mentions in latest observed window

Immediate actions

Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

Mattermost versions 10.11.x <= 10.11.20, 11.7.x <= 11.7.5 Mattermost fails to remove thread membership records when a user is removed from or leaves a team, which allows a previously removed user who is later re-invited to the team to view private channel thread root post content and metadata via the team threads API.. Mattermost Advisory ID: MMSA-2026-00682

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0.0/ 10 priority

Sources & remediation

Vendor / third-party advisories

https://mattermost.com/security-updates

Weakness type (CWE)

CWE-459

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

mattermost_server

Threat summary

2 mentions across 1 observed day

What's happening

Technical details provided in 2 signals
Disclosure: 2 classified signals
2 total mentions across 1 day

Affected systems

Vendors

mattermost

Products

mattermost_server

Deep dive

Activity timeline2 mentions / 1d

Signal classification1 categories

Disclosure

2100.0%

Referenced assets2 URLs

By indicator

Full discourse2 posts

Infoflowcloud@infoflowcloud46d
Disclosure
🚨*CVE* CVE-2026-9693 Mattermost versions 10.11.x <= 10.11.20, 11.7.x <= 11.7.5 Mattermost fails to remove thread membership records when a user is removed from or leaves a team, which allow… https://www.cve.org/CVERecord?id=CVE-2026-9693 ----- Traducción: CVE-2026-9693 Las… https://infoflow.cloud`
Post summary
The post announces CVE-2026-9693, detailing a failure to delete thread membership records after a user exits a team in Mattermost. No PoC, exploit, patch, or active exploitation evidence is provided.
0000026
100 followersView on X
CVE@CVEnew46d
Disclosure
CVE-2026-9693 Mattermost versions 10.11.x <= 10.11.20, 11.7.x <= 11.7.5 Mattermost fails to remove thread membership records when a user is removed from or leaves a team, which allow… https://www.cve.org/CVERecord?id=CVE-2026-9693
Post summary
The notice discloses that Mattermost versions 10.11.x <= 10.11.20 and 11.7.x <= 11.7.5 have a bug that fails to remove thread membership records when a user leaves a team.
000001.1K
58.0K followersView on X

CPE platform detail1 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

1 of 1 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	mattermost	mattermost_server	-	-	-

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