CVE-2021-26598: Impresscms/impresscms Incorrect Access Control Vulnerability

MODERATE
Advisory Identifier: GHSA-48p3-xfvw-g59c
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CVSS 5.3
CWE-287
Published
Advisory Summary

CVE-2021-26598 is a MODERATE (CVSS 5.3) incorrect access control vulnerability (CWE-287: Improper Authentication) affecting Impresscms/impresscms libraries in the Packagist ecosystem. The issue involves incorrect access control in impresscms. Remediation is available by upgrading affected packages to version 1.4.3.

CVE-2021-26598 at a Glance

CVE Identifier CVE-2021-26598
GHSA Identifier GHSA-48p3-xfvw-g59c
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-287: Improper Authentication
Affected Product Impresscms/impresscms
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 5.3

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

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 Low (C:L)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2021-26598

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

impresscms/impresscms fixed: 1.4.3 
Upgrade impresscms/impresscms to 1.4.3
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 impresscms/impresscms

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-26598, inspect your project dependencies for Impresscms/impresscms:

inspect dependencies for impresscms/impresscms

Analyze the terminal output to locate any version of Impresscms/impresscms in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.4.3), 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-287: Improper Authentication, where when an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. In Impresscms/impresscms, 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

ImpressCMS before 1.4.3 has Incorrect Access Control because include/findusers.php allows access by unauthenticated attackers (who are, by design, able to have a security token).

CVE-2021-26598 Affected Impresscms/impresscms Versions

1 component(s)
Fixed Versions:
1.4.3
Product / Package Ecosystem Affected Versions Fixed Version
impresscms/impresscms
 Packagist
< 1.4.3
1.4.3

References

NVD — CVE-2021-26598 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-26598
Impresscms/impresscms Source Repository REPOSITORY
https://github.com/ImpressCMS/impresscms/pull/967
hackerone.com/reports/1081137 WEB
https://hackerone.com/reports/1081137
Impresscms/impresscms Source Repository REPOSITORY
https://github.com/ImpressCMS/impresscms
Impresscms/impresscms Release RELEASE
https://github.com/ImpressCMS/impresscms/releases/tag/v1.4.3
Impresscms/impresscms Security Information SECURITY
https://packetstormsecurity.com/files/166403/ImpressCMS-1.4.2-Incorrect-Access-Control.html
Impresscms/impresscms Security Information SECURITY
http://karmainsecurity.com/KIS-2022-03
seclists.org/fulldisclosure/2022... WEB
http://seclists.org/fulldisclosure/2022/Mar/45

Frequently Asked Questions

What is CVE-2021-26598?
CVE-2021-26598 is a security vulnerability in Impresscms/impresscms involving Incorrect Access Control in ImpressCMS under CWE-287: Improper Authentication.
Which Impresscms/impresscms versions are affected?
Affected versions include releases prior to 1.4.3 across affected packages: impresscms/impresscms.
What version fixes CVE-2021-26598?
Upgrading to 1.4.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is impresscms/impresscms affected?
Yes, impresscms/impresscms is affected in releases prior to 1.4.3. Upgrade your dependency to 1.4.3 or later.
What is the CVSS score of CVE-2021-26598?
CVE-2021-26598 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2021-26598?
CVE-2021-26598 is classified under CWE-287: Improper Authentication (When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.).
How can I check Packagist dependencies for CVE-2021-26598?
Run the dependency tree command: 'inspect dependencies for impresscms/impresscms'. 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-48p3-xfvw-g59c",
  "modified" : "2022-04-05T19:27:38Z",
  "published" : "2022-03-29T00:01:16Z",
  "aliases" : [ "CVE-2021-26598" ],
  "summary" : "Incorrect Access Control in ImpressCMS",
  "details" : "ImpressCMS before 1.4.3 has Incorrect Access Control because include/findusers.php allows access by unauthenticated attackers (who are, by design, able to have a security token).",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "impresscms/impresscms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.4.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-26598"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/ImpressCMS/impresscms/pull/967"
  }, {
    "type" : "WEB",
    "url" : "https://hackerone.com/reports/1081137"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/ImpressCMS/impresscms"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/ImpressCMS/impresscms/releases/tag/v1.4.3"
  }, {
    "type" : "WEB",
    "url" : "https://packetstormsecurity.com/files/166403/ImpressCMS-1.4.2-Incorrect-Access-Control.html"
  }, {
    "type" : "WEB",
    "url" : "http://karmainsecurity.com/KIS-2022-03"
  }, {
    "type" : "WEB",
    "url" : "http://seclists.org/fulldisclosure/2022/Mar/45"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-287" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-03-30T19:56:34Z",
    "nvd_published_at" : "2022-03-28T01:15:00Z"
  }
}