CVE-2024-10214Network attack vector

Session duplication via premature SSO login

Published Oct 28, 2024 · Updated Oct 28, 2024

Authentication flaw in Mattermost 9.11.0 through 9.11.1 and 9.5.0 through 9.5.9 allows remote authenticated users to gain an extra session. The OAuth and SAML completion handlers create a browser session before redirecting desktop logins to the desktop-token endpoint, which creates another session. Exploitation requires an interactive desktop SSO login and exposes session-associated information without reported data modification or service interruption.

CVSS severity3.5
Low
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication flaw in Mattermost 9.11.0 through 9.11.1 and 9.5.0 through 9.5.9 allows remote authenticated users to gain an extra session. The OAuth and SAML completion handlers create a browser session before redirecting desktop logins to the desktop-token endpoint, which creates another session. Exploitation requires an interactive desktop SSO login and exposes session-associated information without reported data modification or service interruption.

The record

CVE
CVE-2024-10214
Published
Oct 28, 2024
Updated
Oct 28, 2024
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-303
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 28, 2024CVE publishedPublication date reported by the CVE source.
  2. Oct 28, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=9.11.0 <=9.11.1
  2. Affected versionversion=9.5.0 <=9.5.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Mattermost · Mattermostversion=9.11.0 <=9.11.1; version=9.5.0 <=9.5.9

Published CVSS scores

3.5Mattermost, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 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

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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