CVE-2021-27910: Mautic/core Cross-Site Scripting Vulnerability
HIGHCVE-2021-27910 is a HIGH (CVSS 8.2) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Mautic/core libraries in the Packagist ecosystem. The issue involves stored xss vulnerability on bounce management callback. Remediation is available by upgrading affected packages to version 3.3.4, 4.0.0.
CVE-2021-27910 at a Glance
Security Impact
CVSS: 8.2
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:R/S:C/C:L/I:H/A:N).
How to Fix CVE-2021-27910
To remediate this vulnerability, upgrade all affected Mautic/core 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 mautic/core to 3.3.4Upgrade mautic/core to 4.0.0Run the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for mautic/coreHow to Check if You Are Affected
To determine whether your application is affected by CVE-2021-27910, inspect your project dependencies for Mautic/core:
inspect dependencies for mautic/coreAnalyze the terminal output to locate any version of Mautic/core in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.3.4), 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-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. In Mautic/core, 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-2021-27910 Affected Mautic/core Versions
2 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
mautic/core
|
Packagist |
< 3.3.4
|
3.3.4
|
|
mautic/core
|
Packagist |
≥ 4.0.0-alpha1
< 4.0.0
|
4.0.0
|
References
Frequently Asked Questions
What is CVE-2021-27910?
Which Mautic/core versions are affected?
What version fixes CVE-2021-27910?
Is mautic/core affected?
What is the CVSS score of CVE-2021-27910?
What CWE is associated with CVE-2021-27910?
How can I check Packagist dependencies for CVE-2021-27910?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-86pv-95mj-7w5f",
"modified" : "2021-08-30T18:05:04Z",
"published" : "2021-09-01T18:40:48Z",
"aliases" : [ "CVE-2021-27910" ],
"summary" : "Stored XSS vulnerability on Bounce Management Callback",
"details" : "### Impact\nInsufficient sanitization / filtering allows for arbitrary JavaScript Injection in Mautic using the bounce management callback function. The values submitted in the \"error\" and \"error_related_to\" parameters of the POST request of the bounce management callback will be permanently stored and executed once the details page of an affected lead is opened by a Mautic user.\n\nAn attacker with access to the bounce management callback function (identified with the Mailjet webhook, but it is assumed this will work uniformly across all kinds of webhooks) can inject arbitrary JavaScript Code into the \"error\" and \"error_related_to\" parameters of the POST request (POST /mailer/<product / webhook>/callback). It is noted that there is no authentication needed to access this function.\n\nThe JavaScript Code is stored permanently in the web application and executed every time an authenticated user views the details page of a single contact / lead in Mautic. This means, arbitrary code can be executed to, e.g., steal or tamper with information.\n\n### Patches\nUpgrade to 3.3.4 or 4.0.0\n\n### Workarounds\nNo\n\n### References\nhttps://github.com/mautic/mautic/releases/tag/3.3.4\nhttps://github.com/mautic/mautic/releases/tag/4.0.0\n\n### For more information\nIf you have any questions or comments about this advisory:\n\n* Email us at [security@mautic.org](mailto:security@mautic.org)\n",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Packagist",
"name" : "mautic/core"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "3.3.4"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Packagist",
"name" : "mautic/core"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "4.0.0-alpha1"
}, {
"fixed" : "4.0.0"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/mautic/mautic/security/advisories/GHSA-86pv-95mj-7w5f"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-27910"
}, {
"type" : "WEB",
"url" : "https://github.com/mautic/mautic/commit/e6a405975342f3cf86aa71927618d31d25135fa3"
}, {
"type" : "WEB",
"url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/mautic/core/CVE-2021-27910.yaml"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/mautic/mautic"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-79" ],
"severity" : "HIGH",
"github_reviewed" : true,
"github_reviewed_at" : "2021-08-30T18:05:04Z",
"nvd_published_at" : "2021-08-30T16:15:00Z"
}
}