CVE-2024-2450Network attack vector

Account takeover via unverified SAML ownership switch

Published Mar 15, 2024 · Updated Aug 2, 2024

Improper authentication in Mattermost allows remote authenticated users to take over other accounts via crafted SAML switch requests. The authentication-switch flow accepts an email-to-SAML account change without correctly verifying ownership of the account selected by the request. Exploitation requires an existing authenticated account and SAML sign-in to be enabled; success transfers control of another user's account.

CVSS severity8.8
High
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in Mattermost allows remote authenticated users to take over other accounts via crafted SAML switch requests. The authentication-switch flow accepts an email-to-SAML account change without correctly verifying ownership of the account selected by the request. Exploitation requires an existing authenticated account and SAML sign-in to be enabled; success transfers control of another user's account.

The record

CVE
CVE-2024-2450
Published
Mar 15, 2024
Updated
Aug 2, 2024
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-287, T1078
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 15, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record 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=8.1.0 <8.1.10
  2. Affected versionversion=8.1.0 <=8.1.9
  3. Affected versionversion=9.2.0 <=9.2.5
  4. Affected versionversion=9.2.0 <9.2.6
  5. Affected versionversion=9.3.0 <=9.3.1
  6. Affected versionversion=9.3.0 <9.3.2
  7. Affected versionversion=9.4.0 <=9.4.2
  8. Affected versionversion=9.4.0 <9.4.3
  9. Affected versionversion=9.5.0
  10. Affected versionversion=9.5.0 <9.6.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Mattermost · Mattermostversion=8.1.0 <8.1.10; version=8.1.0 <=8.1.9; version=9.2.0 <=9.2.5; version=9.2.0 <9.2.6; version=9.3.0 <=9.3.1; version=9.3.0 <9.3.2; version=9.4.0 <=9.4.2; version=9.4.0 <9.4.3; version=9.5.0; version=9.5.0 <9.6.0

Published CVSS scores

8.8Mattermost, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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-287Improper Authentication
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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