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CVE-2024-31859

Member promoted to channel admin via playbooks run linking to channel

MEDIUM
6.3
CVSS Score
Published: May 26, 2024 at 01:31 PM UTC
Updated: June 17, 2026 at 07:28 AM UTC
2 products affected across 1 vendorMattermost ServerMattermost

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Severity
MEDIUM6.3
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

Mattermost versions 9.5.x <= 9.5.3, 9.6.x <= 9.6.1 and 8.1.x <= 8.1.12 fail to perform proper authorization checks which allows a member running a playbook in an existing channel to be promoted to a channel admin

Affected

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

Mattermost Server· Mattermost
95%
8.1.0 ≤ v < 8.1.139.5.0 ≤ v < 9.5.49.6.0 ≤ v < 9.6.2
Mattermost· Mattermost
60%
8.1.0 ≤ v ≤ 8.1.129.5.0 ≤ v ≤ 9.5.39.6.0 ≤ v ≤ 9.6.18.1.09.5.09.6.0
Vendor states this is fixed in 8.1.13 (unaffected)
Vendor states this is fixed in 9.5.4 (unaffected)
Vendor states this is fixed in 9.6.2 (unaffected)
Vendor states this is fixed in 9.7.0 (unaffected)

Remediation

No guide yet

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

Patch and advisory references

References (1)

Vendor Advisory
Source: [email protected]
https://mattermost.com/security-updates

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.3MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
LOW
Vector?

Quick Info

StatusANALYZED
CWE
CWE-284

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