CVE-2021-23266: Craftercms Log Value Insertion Vulnerability

MODERATE
Advisory Identifier: GHSA-545f-pgp7-fwjf
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CVSS 4.3
CWE-116
Published
Advisory Summary

CVE-2021-23266 is a MODERATE (CVSS 4.3) log value insertion vulnerability (CWE-116: Improper Encoding or Escaping of Output) affecting Craftercms libraries in the Maven ecosystem. The issue involves log value insertion in craftercms. Remediation is available by upgrading affected packages to version 3.1.18.

CVE-2021-23266 at a Glance

CVE Identifier CVE-2021-23266
GHSA Identifier GHSA-545f-pgp7-fwjf
Severity MODERATE
CVSS v3.1 Base Score 4.3
CWE Classification CWE-116: Improper Encoding or Escaping of Output
Affected Product Craftercms
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 4.3

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:U/C:N/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2021-23266

To remediate this vulnerability, upgrade all affected Craftercms dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

org.craftercms:craftercms fixed: 3.1.18 
<dependency>
    <groupId>org.craftercms</groupId>
    <artifactId>craftercms</artifactId>
    <version>3.1.18</version>
</dependency>
Verify Direct and Transitive Dependencies

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

mvn dependency:tree -Dincludes=org.craftercms

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2021-23266, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.craftercms

Analyze the terminal output to locate any version of Craftercms in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.1.18), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.craftercms command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-116: Improper Encoding or Escaping of Output, where the product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. as a result, the intended structure of the message is not preserved. In Craftercms, 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

An anonymous user can craft a URL with text that ends up in the log viewer as is. The text can then include textual messages to mislead the administrator.

CVE-2021-23266 Affected Craftercms Versions

1 component(s)
Fixed Versions:
3.1.18
Product / Package Ecosystem Affected Versions Fixed Version
org.craftercms:craftercms
maven/org.craftercms/craftercms
Maven
≥ 3.1.0
< 3.1.18
3.1.18

References

NVD — CVE-2021-23266 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-23266
Craftercms Security Information SECURITY
https://docs.craftercms.org/en/3.1/security/advisory.html#cv-2022051602

Frequently Asked Questions

What is CVE-2021-23266?
CVE-2021-23266 is a security vulnerability in Craftercms involving Log value insertion in craftercms under CWE-116: Improper Encoding or Escaping of Output.
Which Craftercms versions are affected?
Affected versions include releases prior to 3.1.18 across affected packages: org.craftercms:craftercms.
What version fixes CVE-2021-23266?
Upgrading to 3.1.18 (or the latest patched release for your respective branch) resolves the vulnerability.
Is craftercms affected?
Yes, org.craftercms:craftercms is affected in releases prior to 3.1.18. Upgrade your dependency to 3.1.18 or later.
What is the CVSS score of CVE-2021-23266?
CVE-2021-23266 has a CVSS v3.1 base score of 4.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.
What CWE is associated with CVE-2021-23266?
CVE-2021-23266 is classified under CWE-116: Improper Encoding or Escaping of Output (The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.).
How can I check Maven dependencies for CVE-2021-23266?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.craftercms'. 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-545f-pgp7-fwjf",
  "modified" : "2022-06-01T21:14:49Z",
  "published" : "2022-05-17T00:00:33Z",
  "aliases" : [ "CVE-2021-23266" ],
  "summary" : "Log value insertion in craftercms",
  "details" : "An anonymous user can craft a URL with text that ends up in the log viewer as is. The text can then include textual messages to mislead the administrator.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.craftercms:craftercms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.1.0"
      }, {
        "fixed" : "3.1.18"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-23266"
  }, {
    "type" : "WEB",
    "url" : "https://docs.craftercms.org/en/3.1/security/advisory.html#cv-2022051602"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-116" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-06-01T21:14:49Z",
    "nvd_published_at" : "2022-05-16T17:15:00Z"
  }
}