CVE-2026-1776: Camaleon cms Path Traversal Vulnerability

MODERATE
Advisory Identifier: GHSA-jw5g-f64p-6x78
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CVSS 6.5
CWE-22
Published
Advisory Summary

CVE-2026-1776 is a MODERATE (CVSS 6.5) path traversal vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting Camaleon cms libraries in the RubyGems ecosystem. The issue involves camaleon cms vulnerable to path traversal through aws s3 uploader implementation. Remediation is available in the latest vendor maintenance releases.

CVE-2026-1776 at a Glance

CVE Identifier CVE-2026-1776
GHSA Identifier GHSA-jw5g-f64p-6x78
Severity MODERATE
CVSS v3.1 Base Score 6.5
CWE Classification CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Affected Product Camaleon cms
Package Ecosystem RubyGems
Published Date
Last Updated

Security Impact

CVSS: 6.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N).

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

How to Fix CVE-2026-1776

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

camaleon_cms fixed: Latest secure release 
Upgrade camaleon_cms 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 camaleon_cms

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-1776, inspect your project dependencies for Camaleon cms:

inspect dependencies for camaleon_cms

Analyze the terminal output to locate any version of Camaleon cms 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-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), where the product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. In Camaleon cms, 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

Camaleon CMS versions 2.4.5.0 through 2.9.1, prior to commit f54a77e, contain a path traversal vulnerability in the AWS S3 uploader implementation that allows authenticated users to read arbitrary files from the web server’s filesystem. The issue occurs in the download_private_file functionality when the application is configured to use the CamaleonCmsAwsUploader backend. Unlike the local uploader implementation, the AWS uploader does not validate file paths with valid_folder_path?, allowing directory traversal sequences to be supplied via the file parameter. As a result, any authenticated user, including low-privileged registered users, can access sensitive files such as /etc/passwd. This issue represents a bypass of the incomplete fix for CVE-2024-46987 and affects deployments using the AWS S3 storage backend.

CVE-2026-1776 Affected Camaleon cms Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
camaleon_cms
gem/camaleon_cms
RubyGems
≥ 2.4.5.0
≤ 2.9.1

References

NVD — CVE-2026-1776 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-1776
Camaleon cms Source Repository REPOSITORY
https://github.com/owen2345/camaleon-cms/pull/1127
Security Fix Commit FIX COMMIT
https://github.com/owen2345/camaleon-cms/commit/f54a77e2a7be601215ea1b396038c589a0cab9af
camaleon.website WEB
https://camaleon.website
Camaleon cms Source Repository REPOSITORY
https://github.com/owen2345/camaleon-cms
Camaleon cms Source Repository REPOSITORY
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/camaleon_cms/CVE-2026-1776.yml
www.vulncheck.com/advisories/camaleon... WEB
https://www.vulncheck.com/advisories/camaleon-cms-aws-uploader-authenticated-path-traversal-arbitrary-file-read

Frequently Asked Questions

What is CVE-2026-1776?
CVE-2026-1776 is a security vulnerability in Camaleon cms involving Camaleon CMS vulnerable to Path Traversal through AWS S3 uploader implementation under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').
Which Camaleon cms versions are affected?
Affected versions include releases prior to current release patches across affected packages: camaleon_cms.
What version fixes CVE-2026-1776?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is camaleon_cms affected?
Yes, camaleon_cms 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-2026-1776?
CVE-2026-1776 has a CVSS v3.1 base score of 6.5 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2026-1776?
CVE-2026-1776 is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') (The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.).
How can I check RubyGems dependencies for CVE-2026-1776?
Run the dependency tree command: 'inspect dependencies for camaleon_cms'. 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-jw5g-f64p-6x78",
  "modified" : "2026-04-24T20:45:33Z",
  "published" : "2026-03-10T09:31:46Z",
  "aliases" : [ "CVE-2026-1776" ],
  "summary" : "Camaleon CMS vulnerable to Path Traversal through AWS S3 uploader implementation",
  "details" : "Camaleon CMS versions 2.4.5.0 through 2.9.1, prior to commit f54a77e, contain a path traversal vulnerability in the AWS S3 uploader implementation that allows authenticated users to read arbitrary files from the web server’s filesystem. The issue occurs in the download_private_file functionality when the application is configured to use the CamaleonCmsAwsUploader backend. Unlike the local uploader implementation, the AWS uploader does not validate file paths with valid_folder_path?, allowing directory traversal sequences to be supplied via the file parameter. As a result, any authenticated user, including low-privileged registered users, can access sensitive files such as /etc/passwd. This issue represents a bypass of the incomplete fix for CVE-2024-46987 and affects deployments using the AWS S3 storage backend.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "camaleon_cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.4.5.0"
      }, {
        "last_affected" : "2.9.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-1776"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/owen2345/camaleon-cms/pull/1127"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/owen2345/camaleon-cms/commit/f54a77e2a7be601215ea1b396038c589a0cab9af"
  }, {
    "type" : "WEB",
    "url" : "https://camaleon.website"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/owen2345/camaleon-cms"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/camaleon_cms/CVE-2026-1776.yml"
  }, {
    "type" : "WEB",
    "url" : "https://www.vulncheck.com/advisories/camaleon-cms-aws-uploader-authenticated-path-traversal-arbitrary-file-read"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-11T00:31:16Z",
    "nvd_published_at" : "2026-03-10T07:38:01Z"
  }
}