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CVE-2025-24920

Unauthorized Bookmark Creation and Modification in Archived Channels

MEDIUM
4.3
CVSS Score
Published: March 21, 2025 at 08:25 AM UTC
Updated: June 17, 2026 at 08:59 AM UTC
2 products affected across 1 vendorMattermost ServerMattermost

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Severity
MEDIUM4.3
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

Mattermost versions 10.4.x <= 10.4.2, 10.3.x <= 10.3.3, 9.11.x <= 9.11.8, 10.5.x <= 10.5.0 fail to restrict bookmark creation and updates in archived channels, which allows authenticated users created or update bookmarked in archived channels

Affected

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

Mattermost Server· Mattermost
95%
10.3.0 ≤ v < 10.3.410.4.0 ≤ v < 10.4.310.5.0 ≤ v < 10.5.19.11.0 ≤ v < 9.11.9
Affected range stops below 10.3.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.4.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.5.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.11.9, so it looks safe — our inference, not a vendor statement
Mattermost· Mattermost
60%
10.3.0 ≤ v ≤ 10.3.310.4.0 ≤ v ≤ 10.4.29.11.0 ≤ v ≤ 9.11.810.3.010.4.010.5.09.11.0
Vendor states this is fixed in 10.3.4 (unaffected)
Vendor states this is fixed in 10.4.3 (unaffected)
Vendor states this is fixed in 10.5.1 (unaffected)
Vendor states this is fixed in 10.6.0 (unaffected)
Vendor states this is fixed in 9.11.9 (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

4.3MEDIUMMattermost
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-863

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