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CVE-2025-20033

DoS via custom post type for sysconsole plugin readers

MEDIUM
6.5
CVSS Score
Published: January 9, 2025 at 06:55 AM UTC
Updated: June 17, 2026 at 08:40 AM UTC
2 products affected across 1 vendorMattermost ServerMattermost

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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.6%
SSVC
No known exploit

Description

Mattermost versions 10.2.0, 9.11.x <= 9.11.5, 10.0.x <= 10.0.3, 10.1.x <= 10.1.3 fail to properly validate post types, which allows attackers to deny service to users with the sysconsole_read_plugins permission via creating a post with the custom_pl_notification type and specific props.

Affected

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

Mattermost Server· Mattermost
95%
10.0.0 ≤ v < 10.0.410.1.0 ≤ v < 10.1.410.2.0 ≤ v < 10.2.19.11.0 ≤ v < 9.11.6
Mattermost· Mattermost
60%
10.0.0 ≤ v ≤ 10.0.310.1.0 ≤ v ≤ 10.1.39.11.0 ≤ v ≤ 9.11.510.0.010.1.010.2.09.11.0
Vendor states this is fixed in 10.0.4 (unaffected)
Vendor states this is fixed in 10.1.4 (unaffected)
Vendor states this is fixed in 10.2.1 (unaffected)
Vendor states this is fixed in 10.3.0 (unaffected)
Vendor states this is fixed in 9.11.6 (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

6.5MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-1287

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