CVE-2025-62690: Github.com/mattermost/mattermost/server/v8 Mattermost Has Missing Redirect URL Vulnerability
LOWCVE-2025-62690 is a LOW (CVSS 3.1) mattermost has missing redirect url vulnerability (CWE-601: URL Redirection to Untrusted Site ('Open Redirect')) affecting Github.com/mattermost/mattermost/server/v8 libraries in the Go ecosystem. The issue involves mattermost has missing redirect url validation. Remediation is available by upgrading affected packages to version 8.0.0-20251016131338-dad6bd7a1509, 10.11.5-0.20251016131338-dad6bd7a1509, 11.1.0.
CVE-2025-62690 at a Glance
Security Impact
CVSS: 3.1
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N).
How to Fix CVE-2025-62690
To remediate this vulnerability, upgrade all affected Github.com/mattermost/mattermost/server/v8 dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20251016131338-dad6bd7a1509Upgrade github.com/mattermost/mattermost to 10.11.5-0.20251016131338-dad6bd7a1509Upgrade github.com/mattermost/mattermost to 11.1.0Run the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for github.com/mattermost/mattermost/server/v8How to Check if You Are Affected
To determine whether your application is affected by CVE-2025-62690, inspect your project dependencies for Github.com/mattermost/mattermost/server/v8:
inspect dependencies for github.com/mattermost/mattermost/server/v8Analyze the terminal output to locate any version of Github.com/mattermost/mattermost/server/v8 in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 8.0.0-20251016131338-dad6bd7a1509), your application is affected.
Note: Verify declared build manifests and deployed runtime container environments.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-601: URL Redirection to Untrusted Site ('Open Redirect'), where the web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect. In Github.com/mattermost/mattermost/server/v8, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2025-62690 Affected Github.com/mattermost/mattermost/server/v8 Versions
3 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
github.com/mattermost/mattermost/server/v8
|
Go |
≥ 8.0.0-20250721062209-4952acea88ce
< 8.0.0-20251016131338-dad6bd7a1509
|
8.0.0-20251016131338-dad6bd7a1509
|
|
github.com/mattermost/mattermost
|
Go |
≥ 10.11.0-rc1
< 10.11.5-0.20251016131338-dad6bd7a1509
|
10.11.5-0.20251016131338-dad6bd7a1509
|
|
github.com/mattermost/mattermost
|
Go |
≥ 11.0.0-alpha.1
< 11.1.0
|
11.1.0
|
References
Frequently Asked Questions
What is CVE-2025-62690?
Which Github.com/mattermost/mattermost/server/v8 versions are affected?
What version fixes CVE-2025-62690?
Is github.com/mattermost/mattermost/server/v8 affected?
Is github.com/mattermost/mattermost affected?
What is the CVSS score of CVE-2025-62690?
What CWE is associated with CVE-2025-62690?
How can I check Go dependencies for CVE-2025-62690?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-q66g-q98c-q454",
"modified" : "2025-12-18T15:25:38Z",
"published" : "2025-12-17T15:34:53Z",
"aliases" : [ "CVE-2025-62690" ],
"summary" : "Mattermost has missing redirect URL validation",
"details" : "Mattermost versions 10.11.x <= 10.11.4 fail to validate redirect URLs on the /error page, which allows an attacker to redirect a victim to a malicious site via a crafted link opened in a new tab.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/mattermost/mattermost/server/v8"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "8.0.0-20250721062209-4952acea88ce"
}, {
"fixed" : "8.0.0-20251016131338-dad6bd7a1509"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/mattermost/mattermost"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "10.11.0-rc1"
}, {
"fixed" : "10.11.5-0.20251016131338-dad6bd7a1509"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/mattermost/mattermost"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "11.0.0-alpha.1"
}, {
"fixed" : "11.1.0"
} ]
} ]
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-62690"
}, {
"type" : "WEB",
"url" : "https://github.com/mattermost/mattermost/commit/dad6bd7a1509054580a0898bbc0e026aac3b30cb"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/mattermost/mattermost"
}, {
"type" : "WEB",
"url" : "https://mattermost.com/security-updates"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-601" ],
"severity" : "LOW",
"github_reviewed" : true,
"github_reviewed_at" : "2025-12-18T15:25:38Z",
"nvd_published_at" : "2025-12-17T13:15:58Z"
}
}