{"cve":{"cve_id":"CVE-2021-41246","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.00894,"epss_percentile":0.54803,"epss_as_of":"2026-06-23","description":"Express OpenID Connect is express JS middleware implementing sign on for Express web apps using OpenID Connect. Versions before and including `2.5.1` do not regenerate the session id and session cookie when user logs in. This behavior opens up the application to various session fixation vulnerabilities. Versions `2.5.2` contains a patch for this issue.","published_at":"2021-12-09T15:55:10Z","last_modified_at":null,"cvss_v3_score":4.6,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N","cvss_v3_severity":"MEDIUM","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-384"],"nvd_references":["https://github.com/auth0/express-openid-connect/security/advisories/GHSA-7rg2-qxmf-hhx9","https://github.com/auth0/express-openid-connect/commit/5ab67ff2bd84f76674066b5e129b43ab5f2f430f","https://github.com/auth0/express-openid-connect/releases/tag/v2.5.2"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:39.878444Z","updated_at":"2026-06-28T23:16:12.770802Z"},"effective_severity":"MEDIUM","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"L","value_label":"Low"},{"metric":"UI","name":"User Interaction","value":"R","value_label":"Required"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"L","value_label":"Low"},{"metric":"I","name":"Integrity","value":"L","value_label":"Low"},{"metric":"A","name":"Availability","value":"N","value_label":"None"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"auth0","vendor_name":"auth0","product_slug":"express-openid-connect","product_name":"express-openid-connect","version_start":">= 2.3.0, < 2.5.2","version_start_inclusive":true,"version_end":">= 2.3.0, < 2.5.2","version_end_inclusive":true,"cpe23_uri":"cve5:auth0:express-openid-connect:>= 2.3.0, < 2.5.2:>= 2.3.0, < 2.5.2"}],"exploit_refs":[],"news":[],"references":[{"url":"https://github.com/auth0/express-openid-connect/security/advisories/GHSA-7rg2-qxmf-hhx9","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://github.com/auth0/express-openid-connect/commit/5ab67ff2bd84f76674066b5e129b43ab5f2f430f","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/auth0/express-openid-connect/releases/tag/v2.5.2","source_type":"PATCH","tags":["patch"]}],"timeline":[{"type":"published","at":"2021-12-09T15:55:10Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:19:34.559284Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:19:34.559284Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:19:34.559284Z","label":"CVSS score revised","source":"cvelistv5"}]}