---
title: "CVE-2025-47275: Brute Force Authentication Tags of CookieStore Sessions in Auth0-PHP SDK"
url: https://erroneo.us/security/cve/CVE-2025-47275/
description: "CVE-2025-47275 (auth0/auth0-php (Composer (PHP))): Auth0-PHP provides the PHP SDK for Auth0 Authentication and Management APIs. Starting in version…"
type: vulnerability-record
section: "Security Digest"
date_published: 2025-05-15
date_modified: 2025-05-22
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2025-47275"
kev: false
cvss: 9.1
epss: 0.00539
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2025-47275: Brute Force Authentication Tags of CookieStore Sessions in Auth0-PHP SDK

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.5% , percentile 45: FIRST’s model estimates a 0.5% chance of exploitation activity in the next 30 days, higher than 45% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes auth0/auth0-php (Composer (PHP)) >= 8.0.0-BETA1, < 8.14.0, fixed in 8.14.0 . Check your lockfile, including transitive dependencies.

## What it is

Auth0-PHP provides the PHP SDK for Auth0 Authentication and Management APIs. Starting in version 8.0.0-BETA1 and prior to version 8.14.0, session cookies of applications using the Auth0-PHP SDK configured with CookieStore have authentication tags that can be brute forced, which may result in unauthorized access. Certain pre-conditions are required to be vulnerable to this issue: Applications using the Auth0-PHP SDK, or the Auth0/symfony, Auth0/laravel-auth0, and Auth0/wordpress SDKs that rely on the Auth0-PHP SDK; and session storage configured with CookieStore. Upgrade Auth0/Auth0-PHP to v8.14.0 to receive a patch. As an additional precautionary measure, rotating cookie encryption keys is recommended. Note that once updated, any previous session cookies will be rejected.

## Affected packages

- Composer (PHP) `auth0/auth0-php` >= 8.0.0-BETA1, < 8.14.0 → fixed: 8.14.0

## Affected products (CVE record)

- auth0 auth0-PHP: >= 8.0.0-BETA1, < 8.14.0

## Severity

- GitHub_M CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`
- GitHub CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.54% probability of exploitation activity in the next 30 days; percentile 45.

## Sources

- [GitHub Advisory GHSA-g98g-r7gf-2r25](https://github.com/advisories/GHSA-g98g-r7gf-2r25)
- [CVE.org record CVE-2025-47275](https://www.cve.org/CVERecord?id=CVE-2025-47275)
- [NVD entry CVE-2025-47275](https://nvd.nist.gov/vuln/detail/CVE-2025-47275)
- [github.com](https://github.com/auth0/auth0-PHP/security/advisories/GHSA-g98g-r7gf-2r25)
- [github.com](https://github.com/auth0/laravel-auth0/security/advisories/GHSA-9fwj-9mjf-rhj3)
- [github.com](https://github.com/auth0/symfony/security/advisories/GHSA-9wg9-93h9-j8ch)
- [github.com](https://github.com/auth0/wordpress/security/advisories/GHSA-2f4r-34m4-3w8q)
- [github.com](https://github.com/auth0/auth0-PHP/commit/52a79480fdb246f59dbc089b81a784ae049bd389)
- [github.com](https://github.com/auth0/auth0-PHP/releases/tag/8.14.0)

---
Source page: https://erroneo.us/security/cve/CVE-2025-47275/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt