CVE-2025-2571Network attack vector

Bot account takeover via retained OAuth credentials

Published May 30, 2025 · Updated May 30, 2025

Authentication bypass in affected Mattermost Server releases allows remote authenticated users to gain access to converted bot accounts. Account conversion leaves the user's Google OAuth credentials attached, and the Google OAuth signup flow accepts those stale credentials for the bot account. Exploitation requires a low-privileged account linked to Google OAuth that an administrator later converts to a bot, exposing that bot's permitted data and actions.

CVSS severity4.2
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in affected Mattermost Server releases allows remote authenticated users to gain access to converted bot accounts. Account conversion leaves the user's Google OAuth credentials attached, and the Google OAuth signup flow accepts those stale credentials for the bot account. Exploitation requires a low-privileged account linked to Google OAuth that an administrator later converts to a bot, exposing that bot's permitted data and actions.

The record

CVE
CVE-2025-2571
Published
May 30, 2025
Updated
May 30, 2025
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-303, CAPEC-90, T1078
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 30, 2025CVE publishedPublication date reported by the CVE source.
  2. May 30, 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=10.5.0 <=10.5.3
  2. Affected versionversion=10.6.0 <=10.6.2
  3. Affected versionversion=10.7.0
  4. Affected versionversion=9.11.0 <=9.11.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Mattermost · Mattermostversion=10.5.0 <=10.5.3; version=10.6.0 <=10.6.2; version=10.7.0; version=9.11.0 <=9.11.12

Published CVSS scores

4.2Mattermost, Inc.CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/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-303Incorrect Implementation of Authentication Algorithm
CAPEC-90Reflection Attack in Authentication Protocol
T1078Valid Accounts

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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