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CVE-2026-93847

Improper post type validation on scheduled post endpoints

LOW

3.5

CVSS Score

Published: October 26, 2026 at 02:15 PM UTC

Updated: October 26, 2026 at 04:50 PM UTC

1 product affected across 1 vendorMattermost

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Severity

LOW3.5

Exploit prediction

EPSS 0.2%

Description

Mattermost versions 11.7.x <= 11.7.10 fail to validate reserved system post types on the scheduled post creation and publication paths which allows an authenticated channel member to publish messages rendering as trusted system events via the scheduled post endpoint.. Mattermost Advisory ID: MMSA-2026-00732

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Mattermost · Mattermost

90%

Vendor states this is fixed in 11.11.0 (unaffected)

Vendor states this is fixed in 11.7.11 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://mattermost.com/security-updates

References (1)

Vendor Advisory

Source: cverecord

https://mattermost.com/security-updates

CVSS

3.5LOWMattermost

Attack Vector: NETWORK
Complexity: LOW
Privileges: LOW
User Interaction: REQUIRED
Scope: UNCHANGED
Confidentiality: NONE
Integrity: LOW
Availability: NONE

Vector?

Quick Info

StatusUNDERGOING ANALYSIS

CWE

CWE-863

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