# User enumeration in authentication mechanisms

Source: https://junglewise.ai/threats/user-enumeration-in-authentication-mechanisms-69ab8175  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2021-05-17  
License: CC BY 4.0 with a link back

Severity: info · Published 2021-05-17

User enumeration in authentication mechanisms

Technologies: [symfony/security-http (Packagist)](https://junglewise.ai/threats/technologies/symfony-security-http), [symfony/symfony (Packagist)](https://junglewise.ai/threats/technologies/symfony-symfony). Vendors: [Packagist](https://junglewise.ai/threats/vendors/packagist).

## Quick answers

**Is This vulnerability exploited in the wild?** No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.

**How severe is This vulnerability?** Informational severity, published 17 May 2021.

**Which products and versions are affected?** symfony/security-http (Packagist) ECOSYSTEM:introduced=5.1.0,fixed=5.2.8; symfony/symfony (Packagist) ECOSYSTEM:introduced=5.1.0,fixed=5.2.8.

**Is there a fix for This vulnerability?** Yes. symfony/security-http (Packagist): upgrade to 5.2.8 or later; symfony/symfony (Packagist): upgrade to 5.2.8 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected?** Check whether you run symfony/security-http (Packagist) or symfony/symfony (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- symfony/security-http (Packagist): upgrade to 5.2.8 or later

  ```sh
  composer require symfony/security-http:^5.2.8
  ```

- symfony/symfony (Packagist): upgrade to 5.2.8 or later

  ```sh
  composer require symfony/symfony:^5.2.8
  ```


## Affected products

- symfony/security-http (Packagist) ECOSYSTEM:introduced=5.1.0,fixed=5.2.8
- symfony/symfony (Packagist) ECOSYSTEM:introduced=5.1.0,fixed=5.2.8

## Related threats

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- [Symfony HTTP Foundation ReDoS in HeaderUtils::split()](https://junglewise.ai/threats/cve-2026-108082-symfony-is-a-php-framework-for-web-and-console-applications-and)
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