{"id":"CVE-2026-34839","summary":"Glances Vulnerable to Cross-Origin Information Disclosure via Unauthenticated REST API (/api/4) due to Permissive CORS","details":"Glances is an open-source system cross-platform monitoring tool. Prior to version 4.5.4, the Glances web server exposes a REST API (`/api/4/*`) that is accessible without authentication and allows cross-origin requests from any origin due to a permissive CORS policy (`Access-Control-Allow-Origin: *`). This allows a malicious website to read sensitive system information from a running Glances instance in the victim’s browser, leading to cross-origin data exfiltration. While a previous advisory exists for XML-RPC CORS issues, this report demonstrates that the REST API (`/api/4/*`) is also affected and exposes significantly more sensitive data. Version 4.5.4 patches the issue.","aliases":["GHSA-gfc2-9qmw-w7vh","PYSEC-2026-2175"],"modified":"2026-07-15T01:49:19.367321914Z","published":"2026-04-20T23:09:02.551Z","related":["openSUSE-SU-2026:10602-1"],"database_specific":{"cwe_ids":["CWE-200","CWE-306","CWE-942"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34839.json","cna_assigner":"GitHub_M"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34839.json"},{"type":"ADVISORY","url":"https://github.com/nicolargo/glances/security/advisories/GHSA-gfc2-9qmw-w7vh"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34839"},{"type":"FIX","url":"https://github.com/nicolargo/glances/commit/fdfb977b1d91b5e410bc06c4e19f8bedb0005ce9"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/nicolargo/glances","events":[{"introduced":"0"},{"fixed":"05ff62d883d690809509517dec62684e6c4590d4"},{"fixed":"fdfb977b1d91b5e410bc06c4e19f8bedb0005ce9"}],"database_specific":{"source":["CPE_RANGE","REFERENCES"],"cpe":"cpe:2.3:a:nicolargo:glances:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"4.5.4"}]}}],"versions":["v4.5.3","v4.5.2","v4.5.1","v4.5.0.5","v4.5.0.4","v4.5.0.3","v4.5.0.2","v4.5.0.1","v4.5.0","v4.4.1","v4.4.0","v4.3.3","v4.3.2","v4.3.1","v4.3.0.8","v4.3.0.7","v4.3.0.6","v4.3.0.3","v4.3.0.2","v4.3.0.1","v4.3.0","v4.2.0","v3.4.0","v3.3.1","v3.3.0.1","v3.3.0","v3.2.7","v3.2.6","v3.2.5","v3.2.4.2","v3.2.4.1","v3.2.4","v3.2.3.1","v3.2.3","v3.2.2","v3.2.1","v3.2.0","v3.1.7","v3.1.6.1","v3.1.5","v3.1.4","v3.1.3","v3.1.2","v3.1.1","v3.1.0","v3.0","v2.11","v2.10","v2.9.1","v2.9.0","v2.8.8","v2.8.7","v2.8.6","v2.8.5","v2.8.4","v2.8.3","v2.8.2","v2.8.1","v2.8","v2.7.1","v2.7","v2.7_RC1","v2.5.1","v2.5","v2.4.2","v2.4.1","v2.3","v2.2","v1.7.3","v1.7.2","v1.7.1","v1.7","v1.6.1","v1.6","v1.5.2","v1.5.1","v1.5","v1.4.2.1","v1.4.2","v1.4.1.1","v1.4.1","v1.4","v1.3.7","v1.3.6","v1.3.5","v1.3.4","v1.3.3","v1.3.2","v1.3.1","v1.3","v1.2","v1.1.3","v1.1.2","v1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-34839.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P"}]}