October CMS Session ID not invalidated after logout
Impact
When logging out, the session ID was not invalidated. This is not a problem while the user is logged out, but as soon as the user logs back in the old session ID would be valid again; which means that anyone that gained access to the old session cookie would be able to act as the logged in user. This is not a major concern for the majority of cases, since it requires a malicious party gaining access to the session cookie in the first place, but nevertheless has been fixed.
Patches
Issue has been patched in Build 472 (v1.0.472) and v1.1.2.
Workarounds
Apply https://github.com/octobercms/library/commit/642f597489e6f644d4bd9a0c267e864cabead024 to your installation manually if unable to upgrade to Build 472 or v1.1.2.
References
- Reported by Anisio (Brazilian Information Security Analyst)
- http://cve.circl.lu/cve/CVE-2021-3311
For more information
If you have any questions or comments about this advisory:
- Email us at hello@octobercms.com
Threat assessment:
<img width="699" alt="Screen Shot 2021-02-07 at 11 50 35 PM" src="https://user-images.githubusercontent.com/7253840/107180881-51eaf000-699f-11eb-8828-333128faf2a6.png">Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | october/rain | < 1.0.472, >= 1.1.0, < 1.1.2 | 1.0.472, 1.1.2 |
References
- https://github.com/octobercms/october/security/advisories/GHSA-7ggw-h8pp-r95r
- https://nvd.nist.gov/vuln/detail/CVE-2021-3311
- https://github.com/octobercms/library/commit/642f597489e6f644d4bd9a0c267e864cabead024
- https://anisiosantos.me/october-cms-token-reactivation
- https://octobercms.com/forum/chan/announcements
- https://packagist.org/packages/october/rain
- http://cve.circl.lu/cve/CVE-2021-3311
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- Weakness (CWE)
CWE-613- Platform
- Composer
- Package
october/rain- Disclosed
- 10.02.2021
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-7ggw-h8pp-r95r - CC BY 4.0
Vulnerability history: october/rain
All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 6
- First → latest
- 08.2020 04.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- Medium 5
Disclosures per year
- 2020: 1
- 2021: 1
- 2022: 1
- 2023: 0
- 2024: 0
- 2025: 0
- 2026: 3
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October CMS Session ID not invalidated after logout this entry
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