CVE-2025-24856: TYPO3-EXT-SA-2025-001 Account Takeover Vulnerability

MODERATE
Advisory Identifier: GHSA-hj78-p4h7-m5fv
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CVSS 4.2
CWE-639 CWE-288 CWE-348
Published
Advisory Summary

CVE-2025-24856 is a MODERATE (CVSS 4.2) account takeover vulnerability (CWE-639: Authorization Bypass Through User-Controlled Key) affecting TYPO3-EXT-SA-2025-001 libraries in the Packagist ecosystem. The issue involves account takeover in extension "openid connect authentication" (oidc). Remediation is available by upgrading affected packages to version 4.0.0.

CVE-2025-24856 at a Glance

CVE Identifier CVE-2025-24856
GHSA Identifier GHSA-hj78-p4h7-m5fv
Severity MODERATE
CVSS v3.1 Base Score 4.2
CWE Classification CWE-639: Authorization Bypass Through User-Controlled Key
Affected Product TYPO3-EXT-SA-2025-001
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 4.2

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

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

How to Fix CVE-2025-24856

To remediate this vulnerability, upgrade all affected TYPO3-EXT-SA-2025-001 dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

causal/oidc fixed: 4.0.0 
Upgrade causal/oidc to 4.0.0
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 causal/oidc

How to Check if You Are Affected

To determine whether your application is affected by CVE-2025-24856, inspect your project dependencies for TYPO3-EXT-SA-2025-001:

inspect dependencies for causal/oidc

Analyze the terminal output to locate any version of TYPO3-EXT-SA-2025-001 in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.0.0), 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-639: Authorization Bypass Through User-Controlled Key, where the system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. In TYPO3-EXT-SA-2025-001, 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

## Problem Description A vulnerability in the account linking logic of the extension allows a pre-hijacking attack leading to Account Takeover. The attack can only be exploited if the following requirements are met: - An attacker can anticipate the email address of the user. - An attacker can register a public frontend user account using that email address before the user's first OIDC login. - The IDP returns the field email containing the email address of the user ## Solution An updated versions 4.0.0 is available from the TYPO3 extension manager, packagist and at https://extensions.typo3.org/extension/download/oidc/4.0.0/zip Users of the extension are advised to update the extension as soon as possible.

CVE-2025-24856 Affected TYPO3-EXT-SA-2025-001 Versions

1 component(s)
Fixed Versions:
4.0.0
Product / Package Ecosystem Affected Versions Fixed Version
causal/oidc
 Packagist
≥ 3.0.0
< 4.0.0
4.0.0

References

NVD — CVE-2025-24856 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-24856
Security Fix Commit FIX COMMIT
https://github.com/xperseguers/t3ext-oidc/commit/877e09f6faf4c87bbb41233112ec7e30d3c902b3
TYPO3-EXT-SA-2025-001 Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/causal/oidc/CVE-2025-24856.yaml
TYPO3-EXT-SA-2025-001 Security Information SECURITY
https://typo3.org/security/advisory/typo3-ext-sa-2025-001

Frequently Asked Questions

What is CVE-2025-24856?
CVE-2025-24856 is a security vulnerability in TYPO3-EXT-SA-2025-001 involving Account Takeover in extension "OpenID Connect Authentication" (oidc) under CWE-639: Authorization Bypass Through User-Controlled Key.
Which TYPO3-EXT-SA-2025-001 versions are affected?
Affected versions include releases prior to 4.0.0 across affected packages: causal/oidc.
What version fixes CVE-2025-24856?
Upgrading to 4.0.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is causal/oidc affected?
Yes, causal/oidc is affected in releases prior to 4.0.0. Upgrade your dependency to 4.0.0 or later.
What is the CVSS score of CVE-2025-24856?
CVE-2025-24856 has a CVSS v3.1 base score of 4.2 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N.
What CWE is associated with CVE-2025-24856?
CVE-2025-24856 is classified under CWE-639: Authorization Bypass Through User-Controlled Key (The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.).
How can I check Packagist dependencies for CVE-2025-24856?
Run the dependency tree command: 'inspect dependencies for causal/oidc'. 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-hj78-p4h7-m5fv",
  "modified" : "2025-03-17T20:23:43Z",
  "published" : "2025-01-28T19:15:44Z",
  "aliases" : [ "CVE-2025-24856" ],
  "summary" : "TYPO3-EXT-SA-2025-001: Account Takeover in extension \"OpenID Connect Authentication\" (oidc)",
  "details" : "## Problem Description\nA vulnerability in the account linking logic of the extension allows a pre-hijacking attack leading to Account Takeover. The attack can only be exploited if the following requirements are met:\n\n- An attacker can anticipate the email address of the user.\n- An attacker can register a public frontend user account using that email address before the user's first OIDC login.\n- The IDP returns the field email containing the email address of the user\n\n## Solution\nAn updated versions 4.0.0 is available from the TYPO3 extension manager, packagist and at \nhttps://extensions.typo3.org/extension/download/oidc/4.0.0/zip\n\nUsers of the extension are advised to update the extension as soon as possible.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "causal/oidc"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.0.0"
      }, {
        "fixed" : "4.0.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-24856"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/xperseguers/t3ext-oidc/commit/877e09f6faf4c87bbb41233112ec7e30d3c902b3"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/causal/oidc/CVE-2025-24856.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://typo3.org/security/advisory/typo3-ext-sa-2025-001"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-288", "CWE-348", "CWE-639" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-01-28T19:15:44Z",
    "nvd_published_at" : "2025-03-16T04:15:14Z"
  }
}