{"cve":"CVE-2021-3311","nvd":{"published":"2021-02-05T14:15:19.153","modified":"2026-06-17T04:04:55.230","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-613"],"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"],"products":["octobercms:october"],"source":"nvd","synced_at":"2026-10-19T21:14:10.479542811+00:00"},"epss":{"cve":"CVE-2021-3311","score":0.02939,"percentile":0.87113,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}