CVE-2017-18888: Github.com/mattermost/mattermost server SQL Injection Vulnerability
CRITICALCVE-2017-18888 is a CRITICAL (CVSS 9.8) sql injection vulnerability (CWE-89: Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')) affecting Github.com/mattermost/mattermost server libraries in the Go ecosystem. The issue involves mattermost server is vulnerable to sql injection when executing multiple post requests. Remediation is available by upgrading affected packages to version 4.1.2, 4.2.1, 4.3.0.
CVE-2017-18888 at a Glance
Security Impact
CVSS: 9.8
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).
How to Fix CVE-2017-18888
To remediate this vulnerability, upgrade all affected Github.com/mattermost/mattermost server 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 to 4.1.2Upgrade github.com/mattermost/mattermost-server to 4.2.1Upgrade github.com/mattermost/mattermost-server to 4.3.0Run the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for github.com/mattermost/mattermost-serverHow to Check if You Are Affected
To determine whether your application is affected by CVE-2017-18888, inspect your project dependencies for Github.com/mattermost/mattermost server:
inspect dependencies for github.com/mattermost/mattermost-serverAnalyze the terminal output to locate any version of Github.com/mattermost/mattermost server in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.1.2), 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-89: Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection'), where the product constructs all or part of an sql command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended sql command when it is sent to a downstream component. without sufficient removal or quoting of sql syntax in user-controllable inputs, the generated sql query can cause those inputs to be interpreted as sql instead of ordinary user data. In Github.com/mattermost/mattermost server, 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-2017-18888 Affected Github.com/mattermost/mattermost server Versions
3 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
github.com/mattermost/mattermost-server
|
Go |
< 4.1.2
|
4.1.2
|
|
github.com/mattermost/mattermost-server
|
Go |
≥ 4.2.0-rc1
< 4.2.1
|
4.2.1
|
|
github.com/mattermost/mattermost-server
|
Go |
≥ 4.3.0-rc1
< 4.3.0
|
4.3.0
|
References
Frequently Asked Questions
What is CVE-2017-18888?
Which Github.com/mattermost/mattermost server versions are affected?
What version fixes CVE-2017-18888?
Is github.com/mattermost/mattermost-server affected?
What is the CVSS score of CVE-2017-18888?
What CWE is associated with CVE-2017-18888?
How can I check Go dependencies for CVE-2017-18888?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-v2vm-hq26-5jv6",
"modified" : "2025-12-05T21:50:23Z",
"published" : "2022-05-24T17:21:05Z",
"aliases" : [ "CVE-2017-18888" ],
"summary" : "Mattermost Server is vulnerable to SQL Injection when executing multiple POST requests",
"details" : "An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2. It allows SQL injection during the fetching of multiple posts.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/mattermost/mattermost-server"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "4.1.2"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/mattermost/mattermost-server"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "4.2.0-rc1"
}, {
"fixed" : "4.2.1"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/mattermost/mattermost-server"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "4.3.0-rc1"
}, {
"fixed" : "4.3.0"
} ]
} ]
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2017-18888"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/mattermost/mattermost"
}, {
"type" : "WEB",
"url" : "https://mattermost.com/security-updates"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-89" ],
"severity" : "CRITICAL",
"github_reviewed" : true,
"github_reviewed_at" : "2025-12-05T21:50:23Z",
"nvd_published_at" : "2020-06-19T19:15:00Z"
}
}