# CVE-2021-3311: October CMS Session ID not invalidated after logout

Source: https://junglewise.ai/threats/cve-2021-3311-october-cms-session-id-not-invalidated-after-logout  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2021-02-10  
License: CC BY 4.0 with a link back

CVE-2021-3311 · Severity: low · CVSS 3.1 · Published 2021-02-10

October CMS Session ID not invalidated after logout

Technologies: [october/rain (Packagist)](https://junglewise.ai/threats/technologies/october-rain). Vendors: [Packagist](https://junglewise.ai/threats/vendors/packagist).

## Quick answers

**Is CVE-2021-3311 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2021-3311 being exploited in the wild.

**How severe is CVE-2021-3311?** Low severity, with a CVSS score of 3.1, published 10 February 2021.

**Which products and versions are affected?** october/rain (Packagist) ECOSYSTEM:introduced=0,fixed=1.0.472.

**Is there a fix for CVE-2021-3311?** Yes. october/rain (Packagist): upgrade to 1.0.472 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2021-3311?** Check whether you run october/rain (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

- october/rain (Packagist): upgrade to 1.0.472 or later

  ```sh
  composer require october/rain:^1.0.472
  ```


## Affected products

- october/rain (Packagist) ECOSYSTEM:introduced=0,fixed=1.0.472

## Identifiers

- CVE-2021-3311
- GHSA-7ggw-h8pp-r95r

## Related threats

- [October CMS stored XSS in SVG sanitization logic](https://junglewise.ai/threats/cve-2026-25133-october-cms-stored-xss-in-svg-sanitization-logic)
- [October CMS information disclosure in INI settings parser](https://junglewise.ai/threats/cve-2026-25125-october-cms-information-disclosure-in-ini-settings-parser)
- [October CMS October Rain Twig sandbox bypass via collection methods](https://junglewise.ai/threats/cve-2026-22692-october-cms-october-rain-twig-sandbox-bypass-via-collection)
- [OctoberCMS Cross-Site Scripting](https://junglewise.ai/threats/cve-2017-15284-octobercms-cross-site-scripting)
- [Reliance on Cookies without validation in OctoberCMS](https://junglewise.ai/threats/cve-2020-15128-reliance-on-cookies-without-validation-in-octobercms)