CVE-2026-46725: Mmc/ceselector Remote Code Execution Vulnerability

CRITICAL
Advisory Identifier: GHSA-8x3j-439w-537c
Share
CWE-502
Published
Advisory Summary

CVE-2026-46725 is a CRITICAL remote code execution vulnerability (CWE-502: Deserialization of Untrusted Data) affecting Mmc/ceselector libraries in the Packagist ecosystem. The issue involves typo3 remote code execution in extension "content element selector" (ceselector). Remediation is available by upgrading affected packages to version 6.0.1, 5.0.1, 4.0.2, 3.0.3.

CVE-2026-46725 at a Glance

CVE Identifier CVE-2026-46725
GHSA Identifier GHSA-8x3j-439w-537c
Severity CRITICAL
CVSS v3.1 Base Score N/A
CWE Classification CWE-502: Deserialization of Untrusted Data
Affected Product Mmc/ceselector
Package Ecosystem Packagist
Published Date
Last Updated

How to Fix CVE-2026-46725

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

mmc/ceselector fixed: 6.0.1 
Upgrade mmc/ceselector to 6.0.1
mmc/ceselector fixed: 5.0.1 
Upgrade mmc/ceselector to 5.0.1
mmc/ceselector fixed: 4.0.2 
Upgrade mmc/ceselector to 4.0.2
mmc/ceselector fixed: 3.0.3 
Upgrade mmc/ceselector to 3.0.3
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 mmc/ceselector

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-46725, inspect your project dependencies for Mmc/ceselector:

inspect dependencies for mmc/ceselector

Analyze the terminal output to locate any version of Mmc/ceselector in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 6.0.1), 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-502: Deserialization of Untrusted Data, where the product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid. In Mmc/ceselector, 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 TYPO3 "Content Element Selector" (ceselector) extension passes an attacker-controlled cookie directly to PHP's `unserialize()` without safely processing the input. A remote, unauthenticated attacker can supply a crafted serialized payload to trigger PHP Object Injection, leading to Remote Code Execution on the TYPO3 server. Exploitation requires the content element to be configured with `Persistent Mode: Static` in the plugin settings. This has been patched in version 3.0.3, 4.0.2, 5.0.1, and 6.0.1.

CVE-2026-46725 Affected Mmc/ceselector Versions

4 component(s)
Fixed Versions:
6.0.15.0.14.0.23.0.3
Product / Package Ecosystem Affected Versions Fixed Version
mmc/ceselector
 Packagist
≥ 6.0.0
< 6.0.1
6.0.1
mmc/ceselector
 Packagist
≥ 5.0.0
< 5.0.1
5.0.1
mmc/ceselector
 Packagist
≥ 4.0.0
< 4.0.2
4.0.2
mmc/ceselector
 Packagist
< 3.0.3
3.0.3

References

NVD — CVE-2026-46725 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-46725
bitbucket.org/thismaechler/typo3-... PACKAGE
https://bitbucket.org/thismaechler/typo3-ext-ceselector
Mmc/ceselector Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/mmc/ceselector/CVE-2026-46725.yaml
Mmc/ceselector Security Information SECURITY
https://typo3.org/security/advisory/typo3-ext-sa-2026-013

Frequently Asked Questions

What is CVE-2026-46725?
CVE-2026-46725 is a security vulnerability in Mmc/ceselector involving TYPO3 Remote Code Execution in extension "Content Element Selector" (ceselector) under CWE-502: Deserialization of Untrusted Data.
Which Mmc/ceselector versions are affected?
Affected versions include releases prior to 6.0.1, 5.0.1, 4.0.2, 3.0.3 across affected packages: mmc/ceselector.
What version fixes CVE-2026-46725?
Upgrading to 6.0.1, 5.0.1, 4.0.2, 3.0.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is mmc/ceselector affected?
Yes, mmc/ceselector is affected in releases prior to 6.0.1, 5.0.1, 4.0.2, 3.0.3. Upgrade your dependency to 6.0.1, 5.0.1, 4.0.2, 3.0.3 or later.
What CWE is associated with CVE-2026-46725?
CVE-2026-46725 is classified under CWE-502: Deserialization of Untrusted Data (The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.).
How can I check Packagist dependencies for CVE-2026-46725?
Run the dependency tree command: 'inspect dependencies for mmc/ceselector'. 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-8x3j-439w-537c",
  "modified" : "2026-06-29T17:30:21Z",
  "published" : "2026-05-19T12:31:39Z",
  "aliases" : [ "CVE-2026-46725" ],
  "summary" : "TYPO3 Remote Code Execution in extension \"Content Element Selector\" (ceselector)",
  "details" : "The TYPO3 \"Content Element Selector\" (ceselector) extension passes an attacker-controlled cookie directly to PHP's `unserialize()` without safely processing the input. A remote, unauthenticated attacker can supply a crafted serialized payload to trigger PHP Object Injection, leading to Remote Code Execution on the TYPO3 server. Exploitation requires the content element to be configured with `Persistent Mode: Static` in the plugin settings. This has been patched in version 3.0.3, 4.0.2, 5.0.1, and 6.0.1.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "mmc/ceselector"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "6.0.0"
      }, {
        "fixed" : "6.0.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "mmc/ceselector"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "5.0.0"
      }, {
        "fixed" : "5.0.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "mmc/ceselector"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "4.0.0"
      }, {
        "fixed" : "4.0.2"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "mmc/ceselector"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.0.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-46725"
  }, {
    "type" : "PACKAGE",
    "url" : "https://bitbucket.org/thismaechler/typo3-ext-ceselector"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/mmc/ceselector/CVE-2026-46725.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://typo3.org/security/advisory/typo3-ext-sa-2026-013"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-502" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-06-29T17:30:20Z",
    "nvd_published_at" : "2026-05-19T10:16:25Z"
  }
}