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MEDIUM severity

CVE-2025-24856 — oidc

MEDIUMFix: xperseguers/t3ext-oidc@877e09f

CVE-2025-24856 is a medium-severity (CVSS 4.2) CWE-348 vulnerability in causal/oidc. A fix is available for causal/oidc — see the affected versions and patch details below.

TYPO3-EXT-SA-2025-001: Account Takeover in extension "OpenID Connect Authentication" (oidc)

Also known asGHSA-hj78-p4h7-m5fv
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 3, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2025-24856.

EPSS Exploitation Probability

via FIRST.org ↗
0.2%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs8th percentile — riskier than 8% of all scored CVEsHighest risk
0.00%0.23%0.45%0.68%0.1%0.2%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐘causal/oidc

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

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.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistcausal/oidc≥ 3.0.0&&< 4.0.04.0.0composer require causal/oidc:^4.0.0

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for causal/oidc, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update causal/oidc to 4.0.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2025-24856 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

## 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.
O3 Security · Impact-Aware SCA

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CVE-2025-24856: oidc — Fixed in 4.0.0