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CVE-2025-20051

Arbitrary file read via block duplication in Mattermost Boards

MEDIUM
6.5
CVSS Score
Published: February 24, 2025 at 07:27 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 10.4.x <= 10.4.1, 9.11.x <= 9.11.7, 10.3.x <= 10.3.2, 10.2.x <= 10.2.2 fail to properly validate input when patching and duplicating a board, which allows a user to read any arbitrary file on the system via duplicating a specially crafted block in Boards.

Affected

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

Mattermost Server· Mattermost
95%
10.2.0 ≤ v < 10.2.310.3.0 ≤ v < 10.3.310.4.0 ≤ v < 10.4.29.11.0 ≤ v < 9.11.8
Affected range stops below 10.2.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.3.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.4.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.11.8, so it looks safe — our inference, not a vendor statement
Mattermost· Mattermost
60%
10.2.0 ≤ v ≤ 10.2.210.3.0 ≤ v ≤ 10.3.210.4.0 ≤ v ≤ 10.4.19.11.0 ≤ v ≤ 9.11.710.2.010.3.010.4.09.11.0
Vendor states this is fixed in 10.2.3 (unaffected)
Vendor states this is fixed in 10.3.3 (unaffected)
Vendor states this is fixed in 10.4.2 (unaffected)
Vendor states this is fixed in 10.5.0 (unaffected)
Vendor states this is fixed in 9.11.8 (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 automatableTotal 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
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-22

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