CVE-2025-24920Network attack vector

Authenticated bookmark modification via missing archive restriction

Published Mar 21, 2025 · Updated Mar 21, 2025

Incorrect authorization in affected Mattermost Server releases allows remote authenticated users to alter bookmarks in archived channels. The channel-bookmark creation and update paths omit the archived-channel restriction and accept writes after a channel is archived. A valid account with bookmark permissions and archived-channel access is required; the bounded effect is unauthorized bookmark creation or modification.

CVSS severity4.3
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in affected Mattermost Server releases allows remote authenticated users to alter bookmarks in archived channels. The channel-bookmark creation and update paths omit the archived-channel restriction and accept writes after a channel is archived. A valid account with bookmark permissions and archived-channel access is required; the bounded effect is unauthorized bookmark creation or modification.

The record

CVE
CVE-2025-24920
Published
Mar 21, 2025
Updated
Mar 21, 2025
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-863, T1565
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 21, 2025CVE publishedPublication date reported by the CVE source.
  2. Mar 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.3.0 <=10.3.3
  2. Affected versionversion=10.4.0 <=10.4.2
  3. Affected versionversion=10.5.0
  4. Affected versionversion=9.11.0 <=9.11.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Mattermost · Mattermostversion=10.3.0 <=10.3.3; version=10.4.0 <=10.4.2; version=10.5.0; version=9.11.0 <=9.11.8

Published CVSS scores

4.3GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1565Data Manipulation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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