CVE-2026-72783: Craft CMS Path Traversal Vulnerability

LOW
Advisory Identifier: GHSA-7hxc-f267-h5q7
Share
CWE-22
Published
Advisory Summary

CVE-2026-72783 is a LOW path traversal vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting Craft CMS libraries in the Packagist ecosystem. The issue involves incorrect path validation could potentially lead to path traversal. Remediation is available by upgrading affected packages to version 5.10.6, 4.18.2.

CVE-2026-72783 at a Glance

CVE Identifier CVE-2026-72783
GHSA Identifier GHSA-7hxc-f267-h5q7
Severity LOW
CVSS v3.1 Base Score N/A
CWE Classification CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Affected Product Craft CMS
Package Ecosystem Packagist
Published Date
Last Updated

How to Fix CVE-2026-72783

To remediate this vulnerability, upgrade all affected Craft 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.

craftcms/cms fixed: 5.10.6 
Upgrade craftcms/cms to 5.10.6
craftcms/cms fixed: 4.18.2 
Upgrade craftcms/cms to 4.18.2
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 craftcms/cms

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-72783, inspect your project dependencies for Craft CMS:

inspect dependencies for craftcms/cms

Analyze the terminal output to locate any version of Craft CMS in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 5.10.6), 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 Craft 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

The `ensurePathIsContained` function of the `Local` file system class is theoretically vulnerable to path traversal, although no exploitable scenario has been discovered. When a file is read, an `Asset` object uses the `getFileStream` method of the `Volume` where the asset file is stored, which in turn uses the `getFileStream` method of the file system class used by that `Volume`. For the `Local` file system, this function returns a stream to a file on the local disk after verifying and creating the correct file path. The file path is constructed by first validating the path and then adding a prefix to the validated and normalized path. The prefix is the path to the local directory that houses the particular volume. The order of operations matters here: first, a validation step, afterward a normalization step, and finally the construction of the resulting file path. This opens the possibility of a desanitization-style vulnerability, where the normalization invalidates the assumptions made by the validation or sanitization that preceded it. ## Impact The issue is not directly exploitable, but for hardening, a fix is recommended regardless.

CVE-2026-72783 Affected Craft CMS Versions

2 component(s)
Fixed Versions:
5.10.64.18.2
Product / Package Ecosystem Affected Versions Fixed Version
craftcms/cms
 Packagist
≥ 5.0.0-RC1
< 5.10.6
5.10.6
craftcms/cms
 Packagist
≥ 4.0.0-RC1
< 4.18.2
4.18.2

References

GitHub Advisory / Wiki ADVISORY
https://github.com/craftcms/cms/security/advisories/GHSA-7hxc-f267-h5q7
NVD — CVE-2026-72783 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-72783
Security Fix Commit FIX COMMIT
https://github.com/craftcms/cms/commit/a8425b6c707335e42c35ee2aaf03af50ea4a494d
Security Fix Commit FIX COMMIT
https://github.com/craftcms/cms/commit/bd6b9c175b4892e042e8a03760c39b0e94c4c7d6
Craft CMS Source Repository REPOSITORY
https://github.com/craftcms/cms
Craft CMS Release RELEASE
https://github.com/craftcms/cms/releases/tag/4.18.2
Craft CMS Release RELEASE
https://github.com/craftcms/cms/releases/tag/5.10.6
www.vulncheck.com/advisories/craft-cm... WEB
https://www.vulncheck.com/advisories/craft-cms-rc1-before-path-traversal-via-ensurepathiscontained

Frequently Asked Questions

What is CVE-2026-72783?
CVE-2026-72783 is a security vulnerability in Craft CMS involving Incorrect path validation could potentially lead to path traversal under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').
Which Craft CMS versions are affected?
Affected versions include releases prior to 5.10.6, 4.18.2 across affected packages: craftcms/cms.
What version fixes CVE-2026-72783?
Upgrading to 5.10.6, 4.18.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is craftcms/cms affected?
Yes, craftcms/cms is affected in releases prior to 5.10.6, 4.18.2. Upgrade your dependency to 5.10.6, 4.18.2 or later.
What CWE is associated with CVE-2026-72783?
CVE-2026-72783 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 Packagist dependencies for CVE-2026-72783?
Run the dependency tree command: 'inspect dependencies for craftcms/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-7hxc-f267-h5q7",
  "modified" : "2026-09-01T21:19:11Z",
  "published" : "2026-08-06T21:36:11Z",
  "aliases" : [ "CVE-2026-72783" ],
  "summary" : "Craft CMS: Incorrect path validation could potentially lead to path traversal",
  "details" : "The `ensurePathIsContained` function of the `Local` file system class is theoretically vulnerable to path traversal, although no exploitable scenario has been discovered.\n\nWhen a file is read, an `Asset` object uses the `getFileStream` method of the `Volume` where the asset file is stored, which in turn uses the `getFileStream` method of the file system class used by that `Volume`. For the `Local` file system, this function returns a stream to a file on the local disk after verifying and creating the correct file path.\n\nThe file path is constructed by first validating the path and then adding a prefix to the validated and normalized path. The prefix is the path to the local directory that houses the particular volume. The order of operations matters here: first, a validation step, afterward a normalization step, and finally the construction of the resulting file path. This opens the possibility of a desanitization-style vulnerability, where the normalization invalidates the assumptions made by the validation or sanitization that preceded it.\n\n## Impact\n\nThe issue is not directly exploitable, but for hardening, a fix is recommended regardless.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "craftcms/cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "5.0.0-RC1"
      }, {
        "fixed" : "5.10.6"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "craftcms/cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "4.0.0-RC1"
      }, {
        "fixed" : "4.18.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/craftcms/cms/security/advisories/GHSA-7hxc-f267-h5q7"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-72783"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/craftcms/cms/commit/a8425b6c707335e42c35ee2aaf03af50ea4a494d"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/craftcms/cms/commit/bd6b9c175b4892e042e8a03760c39b0e94c4c7d6"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/craftcms/cms"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/craftcms/cms/releases/tag/4.18.2"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/craftcms/cms/releases/tag/5.10.6"
  }, {
    "type" : "WEB",
    "url" : "https://www.vulncheck.com/advisories/craft-cms-rc1-before-path-traversal-via-ensurepathiscontained"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-08-06T21:36:11Z",
    "nvd_published_at" : null
  }
}