# CVE-2015-8124: Symfony Session Fixation Vulnerability

Source: https://junglewise.ai/threats/cve-2015-8124-symfony-session-fixation-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2022-05-14  
License: CC BY 4.0 with a link back

CVE-2015-8124 · Severity: low · CVSS 3.1 · Published 2022-05-14

Symfony Session Fixation Vulnerability

Technologies: [symfony/security (Packagist)](https://junglewise.ai/threats/technologies/symfony-security), [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 CVE-2015-8124 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2015-8124 being exploited in the wild.

**How severe is CVE-2015-8124?** Low severity, with a CVSS score of 3.1, published 14 May 2022.

**Which products and versions are affected?** symfony/security (Packagist) ECOSYSTEM:introduced=2.3.0,fixed=2.3.35; symfony/security-http (Packagist) ECOSYSTEM:introduced=2.4.0,fixed=2.6.12; symfony/symfony (Packagist) ECOSYSTEM:introduced=2.3.0,fixed=2.3.35.

**Is there a fix for CVE-2015-8124?** Yes. symfony/security (Packagist): upgrade to 2.3.35 or later; symfony/security-http (Packagist): upgrade to 2.6.12 or later; symfony/symfony (Packagist): upgrade to 2.3.35 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2015-8124?** Check whether you run symfony/security (Packagist), 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 (Packagist): upgrade to 2.3.35 or later

  ```sh
  composer require symfony/security:^2.3.35
  ```

- symfony/security-http (Packagist): upgrade to 2.6.12 or later

  ```sh
  composer require symfony/security-http:^2.6.12
  ```

- symfony/symfony (Packagist): upgrade to 2.3.35 or later

  ```sh
  composer require symfony/symfony:^2.3.35
  ```


## Affected products

- symfony/security (Packagist) ECOSYSTEM:introduced=2.3.0,fixed=2.3.35
- symfony/security-http (Packagist) ECOSYSTEM:introduced=2.4.0,fixed=2.6.12
- symfony/symfony (Packagist) ECOSYSTEM:introduced=2.3.0,fixed=2.3.35

## Identifiers

- CVE-2015-8124
- GHSA-j5jh-hpr4-h332

## 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)
- [Symfony Routing improper dot-segment encoding in UrlGenerator](https://junglewise.ai/threats/cve-2026-48784-symfony-routing-improper-dot-segment-encoding-in-urlgenerator)
- [Symfony HtmlSanitizer XSS via incomplete URL attribute sanitization](https://junglewise.ai/threats/cve-2026-48761-symfony-htmlsanitizer-xss-via-incomplete-url-attribute)
- [Symfony HtmlSanitizer visual spoofing via percent-encoded BiDi characters](https://junglewise.ai/threats/cve-2026-48760-symfony-htmlsanitizer-visual-spoofing-via-percent-encoded-bidi)