{"cve":{"cve_id":"CVE-2026-2439","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":0.00403,"epss_percentile":0.31967,"epss_as_of":"2026-06-23","description":"Concierge::Sessions versions from 0.8.1 before 0.8.5 for Perl generate insecure session ids. The generate_session_id function in Concierge::Sessions::Base defaults to using the uuidgen command to generate a UUID, with a fallback to using Perl's built-in rand function. Neither of these methods are secure, and attackers are able to guess session_ids that can grant them access to systems. Specifically,\n\n  *  There is no warning when uuidgen fails. The software can be quietly using the fallback rand() function with no warnings if the command fails for any reason.\n  *  The uuidgen command will generate a time-based UUID if the system does not have a high-quality random number source, because the call does not explicitly specify the --random option. Note that the system time is shared in HTTP responses.\n  *  UUIDs are identifiers whose mere possession grants access, as per RFC 9562.\n  *  The output of the built-in rand() function is predictable and unsuitable for security applications.","published_at":"2026-02-16T21:25:21.091000Z","last_modified_at":null,"cvss_v3_score":9.8,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvss_v3_severity":"CRITICAL","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-340","CWE-338"],"nvd_references":["https://metacpan.org/release/BVA/Concierge-Sessions-v0.8.4/diff/BVA/Concierge-Sessions-v0.8.5#lib/Concierge/Sessions/Base.pm","https://security.metacpan.org/docs/guides/random-data-for-security.html","https://www.rfc-editor.org/rfc/rfc9562.html#name-security-considerations","https://perldoc.perl.org/5.42.0/functions/rand","https://github.com/bwva/Concierge-Sessions/commit/20bb28e92e8fba307c4ff8264701c215be65e73b"],"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":"2026-06-28T23:29:20.607943Z"},"effective_severity":"CRITICAL","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":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"H","value_label":"High"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"bva","vendor_name":"BVA","product_slug":"concierge-sessions","product_name":"Concierge::Sessions","version_start":"0.8.1","version_start_inclusive":true,"version_end":"0.8.5","version_end_inclusive":false,"cpe23_uri":"cve5:bva:concierge-sessions:0.8.1:0.8.5"}],"exploit_refs":[],"news":[],"references":[{"url":"https://metacpan.org/release/BVA/Concierge-Sessions-v0.8.4/diff/BVA/Concierge-Sessions-v0.8.5#lib/Concierge/Sessions/Base.pm","source_type":"MISC","tags":[]},{"url":"https://security.metacpan.org/docs/guides/random-data-for-security.html","source_type":"MISC","tags":[]},{"url":"https://www.rfc-editor.org/rfc/rfc9562.html#name-security-considerations","source_type":"MISC","tags":[]},{"url":"https://perldoc.perl.org/5.42.0/functions/rand","source_type":"MISC","tags":[]},{"url":"https://github.com/bwva/Concierge-Sessions/commit/20bb28e92e8fba307c4ff8264701c215be65e73b","source_type":"PATCH","tags":["patch"]}],"timeline":[{"type":"published","at":"2026-02-16T21:25:21.091000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:52:39.314919Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:52:39.314919Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:52:39.314919Z","label":"CVSS score revised","source":"cvelistv5"}]}