CVE-2026-55742: Cotonti Cross-Site Request Forgery Vulnerability

CRITICAL
Advisory Identifier: GHSA-7g3p-35vc-mgjr
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CVSS 9.6
CWE-352
Published
Advisory Summary

CVE-2026-55742 is a CRITICAL (CVSS 9.6) cross-site request forgery vulnerability (CWE-352: Cross-Site Request Forgery (CSRF)) affecting Cotonti libraries in the Packagist ecosystem. The issue involves cross-site request forgery in the administration rights handler. Remediation is available in the latest vendor maintenance releases.

CVE-2026-55742 at a Glance

CVE Identifier CVE-2026-55742
GHSA Identifier GHSA-7g3p-35vc-mgjr
Severity CRITICAL
CVSS v3.1 Base Score 9.6
CWE Classification CWE-352: Cross-Site Request Forgery (CSRF)
Affected Product Cotonti
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 9.6

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

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
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-2026-55742

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

cotonti/cotonti fixed: Latest secure release 
Upgrade cotonti/cotonti to Latest secure release
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 cotonti/cotonti

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-55742, inspect your project dependencies for Cotonti:

inspect dependencies for cotonti/cotonti

Analyze the terminal output to locate any version of Cotonti in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), 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-352: Cross-Site Request Forgery (CSRF), where the web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor. In Cotonti, 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

Cotonti 1.0.0 (master branch, commit f43f1fc3) is vulnerable to Cross-Site Request Forgery in the administration rights handler. In system/admin/admin.rights.php, the rights update action ('a=update') modifies group access rights (including via cot_auth_add_group) without calling cot_check_xg() to validate the anti-CSRF token. A remote attacker who lures an authenticated administrator into visiting a malicious page can force the browser to submit a forged request that grants elevated permissions to an attacker-controlled group, escalating privileges to administrator. Because Cotonti administrators can modify templates and configuration, this can be further leveraged toward remote code execution.

CVE-2026-55742 Affected Cotonti Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
cotonti/cotonti
 Packagist
≤ 1.0.0

References

NVD — CVE-2026-55742 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-55742
Cotonti Source Repository REPOSITORY
https://github.com/Cotonti/Cotonti
Cotonti Source Repository REPOSITORY
https://github.com/Cotonti/Cotonti/blob/f43f1fc38ba4e02027786dad9dac1435c7c52b30/system/admin/admin.rights.php#L53

Frequently Asked Questions

What is CVE-2026-55742?
CVE-2026-55742 is a security vulnerability in Cotonti involving Cross-Site Request Forgery in the administration rights handler under CWE-352: Cross-Site Request Forgery (CSRF).
Which Cotonti versions are affected?
Affected versions include releases prior to current release patches across affected packages: cotonti/cotonti.
What version fixes CVE-2026-55742?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is cotonti/cotonti affected?
Yes, cotonti/cotonti is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2026-55742?
CVE-2026-55742 has a CVSS v3.1 base score of 9.6 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.
What CWE is associated with CVE-2026-55742?
CVE-2026-55742 is classified under CWE-352: Cross-Site Request Forgery (CSRF) (The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.).
How can I check Packagist dependencies for CVE-2026-55742?
Run the dependency tree command: 'inspect dependencies for cotonti/cotonti'. 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-7g3p-35vc-mgjr",
  "modified" : "2026-06-19T14:52:08Z",
  "published" : "2026-06-18T12:40:25Z",
  "aliases" : [ "CVE-2026-55742" ],
  "summary" : "Cotonti: Cross-Site Request Forgery in the administration rights handler",
  "details" : "Cotonti 1.0.0 (master branch, commit f43f1fc3) is vulnerable to Cross-Site Request Forgery in the administration rights handler. In system/admin/admin.rights.php, the rights update action ('a=update') modifies group access rights (including via cot_auth_add_group) without calling cot_check_xg() to validate the anti-CSRF token. A remote attacker who lures an authenticated administrator into visiting a malicious page can force the browser to submit a forged request that grants elevated permissions to an attacker-controlled group, escalating privileges to administrator. Because Cotonti administrators can modify templates and configuration, this can be further leveraged toward remote code execution.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "cotonti/cotonti"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "1.0.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-55742"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/Cotonti/Cotonti"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/Cotonti/Cotonti/blob/f43f1fc38ba4e02027786dad9dac1435c7c52b30/system/admin/admin.rights.php#L53"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-352" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-06-19T14:52:08Z",
    "nvd_published_at" : "2026-06-18T08:16:34Z"
  }
}