{"id":"CVE-2026-52842","aliases":["EUVD-2026-44720","GHSA-mq6p-m9cc-q432"],"status":"published","title":"Lightpanda:URL parser misidentifies page origin for URLs containing @ in the path - Same-Origin Policy bypass","description":"Lightpanda is a headless browser designed for AI and automation. Prior to 0.3.1, Lightpanda searched for @ across the entire URL string instead of only the authority component when computing a page origin, so a URL such as `http://attacker.com/@victim.com/` was fetched from attacker.com but treated as `http://victim.com`, allowing a complete Same-Origin Policy bypass. This issue is fixed in version 0.3.1.","severity":{"version":"3.1","score":9.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00246,"percentile":0.15926,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-346"],"published":"2026-07-15T16:18:26Z","modified":"2026-10-28T02:30:49Z","products":[{"vendor":"lenovo","product":"browser"},{"vendor":"lightpanda-io","product":"browser"}],"references":[{"url":"https://github.com/lightpanda-io/browser/security/advisories/GHSA-mq6p-m9cc-q432","tags":["x_refsource_CONFIRM","advisory"]},{"url":"https://github.com/lightpanda-io/browser/pull/1998","tags":["x_refsource_MISC","fix"]},{"url":"https://github.com/lightpanda-io/browser/commit/0588cc374d4af9687cf6f45a7d52f7af04bbacfb","tags":["x_refsource_MISC","fix"]},{"url":"https://github.com/lightpanda-io/browser/releases/tag/0.3.1","tags":["x_refsource_MISC","web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52842.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-52842","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-52842","title":"Lightpanda:URL parser misidentifies page origin for URLs containing @ in the path - Same-Origin Policy bypass","description":"Lightpanda is a headless browser designed for AI and automation. Prior to 0.3.1, Lightpanda searched for @ across the entire URL string instead of only the authority component when computing a page origin, so a URL such as `http://attacker.com/@victim.com/` was fetched from attacker.com but treated as `http://victim.com`, allowing a complete Same-Origin Policy bypass. This issue is fixed in version 0.3.1.","status":"published","published":"2026-07-15T16:18:26.157Z","modified":"2026-07-15T16:35:28.146Z","cvss":[{"version":"3.1","score":9.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N","level":"critical","assessor":"cna"}],"cwes":["CWE-346"],"updated_at":"2026-11-02T13:40:57.334596Z"}],"euvd":[{"id":"EUVD-2026-44720","description":"Lightpanda is a headless browser designed for AI and automation. Prior to 0.3.1, Lightpanda searched for @ across the entire URL string instead of only the authority component when computing a page origin, so a URL such as `http://attacker.com/@victim.com/` was fetched from attacker.com but treated as `http://victim.com`, allowing a complete Same-Origin Policy bypass. This issue is fixed in version 0.3.1.","status":"published","published":"2026-07-15T16:18:26Z","modified":"2026-07-15T16:35:28Z","cvss":[{"version":"3.1","score":9.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N","level":"critical"}],"updated_at":"2026-11-02T18:19:52.35951Z"}],"nvd":[{"id":"CVE-2026-52842","description":"Lightpanda is a headless browser designed for AI and automation. Prior to 0.3.1, Lightpanda searched for @ across the entire URL string instead of only the authority component when computing a page origin, so a URL such as `http://attacker.com/@victim.com/` was fetched from attacker.com but treated as `http://victim.com`, allowing a complete Same-Origin Policy bypass. This issue is fixed in version 0.3.1.","status":"published","published":"2026-07-15T17:16:50.317Z","modified":"2026-10-24T21:10:00.13Z","cvss":[{"version":"3.1","score":9.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N","level":"critical","assessor":"secondary"}],"cwes":["CWE-346"],"updated_at":"2026-11-02T14:12:29.879716Z"}],"osv":[{"id":"CVE-2026-52842","title":"Lightpanda:URL parser misidentifies page origin for URLs containing @ in the path - Same-Origin Policy bypass","description":"Lightpanda is a headless browser designed for AI and automation. Prior to 0.3.1, Lightpanda searched for @ across the entire URL string instead of only the authority component when computing a page origin, so a URL such as `http://attacker.com/@victim.com/` was fetched from attacker.com but treated as `http://victim.com`, allowing a complete Same-Origin Policy bypass. This issue is fixed in version 0.3.1.","status":"published","published":"2026-07-15T16:18:26.157Z","modified":"2026-10-28T02:30:49.70836184Z","cvss":[{"version":"3.1","score":9.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N","level":"critical"}],"cwes":["CWE-346"],"updated_at":"2026-11-02T15:45:07.431113Z"}]}}