CVE-2021-3311
9.8
CRITICAL · CVSS 3.1 · EPSS 2.9% (pctl 87)
In your normal cycle
Critical by CVSS (9.8), but no sign of active exploitation.
Description
An issue was discovered in October through build 471. It reactivates an old session ID (which had been invalid after a logout) once a new login occurs. NOTE: this violates the intended Auth/Manager.php authentication behavior but, admittedly, is only relevant if an old session ID is known to an attacker.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 2.9% — more likely to be exploited than 87% of all CVEs |
| Weakness | CWE-613 |
| On CISA KEV | no |
| Public exploit | none known |
| Published | 2021-02-05 |
| Last modified | 2026-06-17 |
Affected (1)
| Vendor | Product |
|---|---|
| octobercms | october |
References
- https://anisiosantos.me/october-cms-token-reactivation
- https://github.com/octobercms/library/commit/642f597489e6f644d4bd9a0c267e864cabead024
- https://octobercms.com/forum/chan/announcements
- https://anisiosantos.me/october-cms-token-reactivation
- https://github.com/octobercms/library/commit/642f597489e6f644d4bd9a0c267e864cabead024
- https://octobercms.com/forum/chan/announcements
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