CVE-2021-27911: Mautic/core Cross-Site Scripting Vulnerability

HIGH
Advisory Identifier: GHSA-72hm-fx78-xwhc
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CVSS 8.3
CWE-79
Published
Advisory Summary

CVE-2021-27911 is a HIGH (CVSS 8.3) 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 xss vulnerability on contacts view. Remediation is available by upgrading affected packages to version 3.3.4, 4.0.0.

CVE-2021-27911 at a Glance

CVE Identifier CVE-2021-27911
GHSA Identifier GHSA-72hm-fx78-xwhc
Severity HIGH
CVSS v3.1 Base Score 8.3
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Mautic/core
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 8.3

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:C/C:H/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Changed (S:C)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2021-27911

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.

mautic/core fixed: 3.3.4 
Upgrade mautic/core to 3.3.4
mautic/core fixed: 4.0.0 
Upgrade mautic/core to 4.0.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for mautic/core

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-27911, inspect your project dependencies for Mautic/core:

inspect dependencies for mautic/core

Analyze 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

### Impact Mautic versions before 3.3.4/4.0.0 are vulnerable to an inline JS XSS attack through the contact's first or last name and triggered when viewing a contact's details page then clicking on the action drop down and hovering over the Campaigns button. Contact first and last name can be populated from different sources such as UI, API, 3rd party syncing, forms, etc. ### Patches Upgrade to 3.3.4 or 4.0.0 ### Workarounds No ### References https://github.com/mautic/mautic/releases/tag/3.3.4 https://github.com/mautic/mautic/releases/tag/4.0.0 ### For more information If you have any questions or comments about this advisory: * Email us at [security@mautic.org](mailto:security@mautic.org)

CVE-2021-27911 Affected Mautic/core Versions

2 component(s)
Fixed Versions:
3.3.44.0.0
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

GitHub Advisory / Wiki ADVISORY
https://github.com/mautic/mautic/security/advisories/GHSA-72hm-fx78-xwhc
NVD — CVE-2021-27911 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-27911
Mautic/core Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/mautic/core/CVE-2021-27911.yaml
Mautic/core Source Repository REPOSITORY
https://github.com/mautic/mautic

Frequently Asked Questions

What is CVE-2021-27911?
CVE-2021-27911 is a security vulnerability in Mautic/core involving XSS vulnerability on contacts view under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Mautic/core versions are affected?
Affected versions include releases prior to 3.3.4, 4.0.0 across affected packages: mautic/core.
What version fixes CVE-2021-27911?
Upgrading to 3.3.4, 4.0.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is mautic/core affected?
Yes, mautic/core is affected in releases prior to 3.3.4, 4.0.0. Upgrade your dependency to 3.3.4, 4.0.0 or later.
What is the CVSS score of CVE-2021-27911?
CVE-2021-27911 has a CVSS v3.1 base score of 8.3 (HIGH) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H.
What CWE is associated with CVE-2021-27911?
CVE-2021-27911 is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (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.).
How can I check Packagist dependencies for CVE-2021-27911?
Run the dependency tree command: 'inspect dependencies for mautic/core'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-72hm-fx78-xwhc",
  "modified" : "2021-08-30T18:05:52Z",
  "published" : "2021-09-01T18:40:40Z",
  "aliases" : [ "CVE-2021-27911" ],
  "summary" : "XSS vulnerability on contacts view",
  "details" : "### Impact\nMautic versions before 3.3.4/4.0.0 are vulnerable to an inline JS XSS attack through the contact's first or last name and triggered when viewing a contact's details page then clicking on the action drop down and hovering over the Campaigns button. Contact first and last name can be populated from different sources such as UI, API, 3rd party syncing, forms, etc. \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* Email us at [security@mautic.org](mailto:security@mautic.org)\n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H"
  } ],
  "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-72hm-fx78-xwhc"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-27911"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/mautic/core/CVE-2021-27911.yaml"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/mautic/mautic"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-30T18:05:52Z",
    "nvd_published_at" : "2021-08-30T16:15:00Z"
  }
}