Vulnerability in Octobercms October
CVE-2021-3311
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.029 (86.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 86.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.029 · newest: 0.029 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- octobercms.com/forum/chan/announcements (Vendor Advisory)
- github.com/octobercms/library/commit/642f597489e6f644d4bd9a0c267e864cabead024 (Patch, Third Party Advisory)
- anisiosantos.me/october-cms-token-reactivation (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-3311?
- CVE-2021-3311 is a critical-severity vulnerability in Octobercms October, classified under Insufficient Session Expiration. CVSS score: 9.8/10. Published 2021-02-05.
- How severe is CVE-2021-3311?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2021-3311 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.