CVE-2021-26642: Xpressengine/xpressengine XpressEngine Vulnerable To Unrestricted Upload Vulnerability

CRITICAL
Advisory Identifier: GHSA-8r5j-22j5-w4cm
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CVSS 9.8
CWE-434
Published
Advisory Summary

CVE-2021-26642 is a CRITICAL (CVSS 9.8) xpressengine vulnerable to unrestricted upload vulnerability (CWE-434: Unrestricted Upload of File with Dangerous Type) affecting Xpressengine/xpressengine libraries in the Packagist ecosystem. The issue involves xpressengine vulnerable to unrestricted upload of file with dangerous type. Remediation is available by upgrading affected packages to version 3.0.15.

CVE-2021-26642 at a Glance

CVE Identifier CVE-2021-26642
GHSA Identifier GHSA-8r5j-22j5-w4cm
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-434: Unrestricted Upload of File with Dangerous Type
Affected Product Xpressengine/xpressengine
Package Ecosystem Packagist
Published Date
Last Updated

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).

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

How to Fix CVE-2021-26642

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

xpressengine/xpressengine fixed: 3.0.15 
Upgrade xpressengine/xpressengine to 3.0.15
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 xpressengine/xpressengine

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-26642, inspect your project dependencies for Xpressengine/xpressengine:

inspect dependencies for xpressengine/xpressengine

Analyze the terminal output to locate any version of Xpressengine/xpressengine in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.0.15), 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-434: Unrestricted Upload of File with Dangerous Type, where the product allows the upload or transfer of dangerous file types that are automatically processed within its environment. In Xpressengine/xpressengine, 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

When uploading an image file to a bulletin board developed with XpressEngine, a vulnerability in which an arbitrary file can be uploaded due to insufficient verification of the file. A remote attacker can use this vulnerability to execute arbitrary code on the server where the bulletin board is running.

CVE-2021-26642 Affected Xpressengine/xpressengine Versions

1 component(s)
Fixed Versions:
3.0.15
Product / Package Ecosystem Affected Versions Fixed Version
xpressengine/xpressengine
 Packagist
< 3.0.15
3.0.15

References

NVD — CVE-2021-26642 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-26642
Xpressengine/xpressengine Source Repository REPOSITORY
https://github.com/xpressengine/xpressengine/issues/1366
boho.or.kr/krcert/secnoticevie... WEB
https://boho.or.kr/krcert/secNoticeView.do?bulletin_writing_sequence=67125

Frequently Asked Questions

What is CVE-2021-26642?
CVE-2021-26642 is a security vulnerability in Xpressengine/xpressengine involving XpressEngine vulnerable to Unrestricted Upload of File with Dangerous Type under CWE-434: Unrestricted Upload of File with Dangerous Type.
Which Xpressengine/xpressengine versions are affected?
Affected versions include releases prior to 3.0.15 across affected packages: xpressengine/xpressengine.
What version fixes CVE-2021-26642?
Upgrading to 3.0.15 (or the latest patched release for your respective branch) resolves the vulnerability.
Is xpressengine/xpressengine affected?
Yes, xpressengine/xpressengine is affected in releases prior to 3.0.15. Upgrade your dependency to 3.0.15 or later.
What is the CVSS score of CVE-2021-26642?
CVE-2021-26642 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2021-26642?
CVE-2021-26642 is classified under CWE-434: Unrestricted Upload of File with Dangerous Type (The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.).
How can I check Packagist dependencies for CVE-2021-26642?
Run the dependency tree command: 'inspect dependencies for xpressengine/xpressengine'. 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-8r5j-22j5-w4cm",
  "modified" : "2023-02-08T17:57:31Z",
  "published" : "2023-01-20T18:30:22Z",
  "aliases" : [ "CVE-2021-26642" ],
  "summary" : "XpressEngine vulnerable to Unrestricted Upload of File with Dangerous Type",
  "details" : "When uploading an image file to a bulletin board developed with XpressEngine, a vulnerability in which an arbitrary file can be uploaded due to insufficient verification of the file. A remote attacker can use this vulnerability to execute arbitrary code on the server where the bulletin board is running.",
  "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" : "Packagist",
      "name" : "xpressengine/xpressengine"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.0.15"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-26642"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/xpressengine/xpressengine/issues/1366"
  }, {
    "type" : "WEB",
    "url" : "https://boho.or.kr/krcert/secNoticeView.do?bulletin_writing_sequence=67125"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-434" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-02-08T17:57:31Z",
    "nvd_published_at" : "2023-01-20T17:15:00Z"
  }
}