Description
Mattermost versions 10.10.x <= 10.10.1, 10.5.x <= 10.5.9, 10.9.x <= 10.9.4 fail to validate the redirect_to parameter, allowing an attacker to craft a malicious link that, once a user authenticates with their SAML provider, could post the user’s cookies to an attacker-controlled URL.
References (1)
Scores
CVSS v3
7.6
EPSS
0.0003
EPSS Percentile
8.8%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
total
Details
CWE
CWE-601
Status
published
Products (3)
mattermost/mattermost
0 - 8.0.0-20250731063404-9eebaadf8f72Go
mattermost/mattermost-server
10.10.0 - 10.10.2Go
mattermost/mattermost_server
10.5.0 - 10.5.10
Published
Sep 15, 2025
Tracked Since
Feb 18, 2026