CVE-2025-12421 (GCVE-0-2025-12421)

Vulnerability from cvelistv5 – Published: 2025-11-27 17:47 – Updated: 2025-12-02 04:55
VLAI?
Summary
Mattermost versions 11.0.x <= 11.0.2, 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to to verify that the token used during the code exchange originates from the same authentication flow, which allows an authenticated user to perform account takeover via a specially crafted email address used when switching authentication methods and sending a request to the /users/login/sso/code-exchange endpoint. The vulnerability requires ExperimentalEnableAuthenticationTransfer to be enabled (default: enabled) and RequireEmailVerification to be disabled (default: disabled).
Severity ?
9.9 (Critical)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CWE
  • CWE-303 - Incorrect Implementation of Authentication Algorithm
Assigner
References
Impacted products
Vendor Product Version
Mattermost Mattermost Affected: 11.0.0 , ≤ 11.0.2 (semver)
Affected: 10.12.0 , ≤ 10.12.1 (semver)
Affected: 10.11.0 , ≤ 10.11.4 (semver)
Affected: 10.5.0 , ≤ 10.5.12 (semver)
Unaffected: 11.1.0
Unaffected: 11.0.3
Unaffected: 10.12.2
Unaffected: 10.11.5
Unaffected: 10.5.13
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Credits
daw10
Show details on NVD website
To clipboard 

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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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