{"id":"CVE-2026-52843","aliases":["EUVD-2026-44714","GHSA-36mm-v3c2-24cc"],"status":"published","title":"Lightpanda: fetch() and XMLHttpRequest attach session cookies to cross-origin requests regardless of credentials mode","description":"Lightpanda is a headless browser designed for AI and automation. Prior to 0.2.9, Lightpanda fetch() and XMLHttpRequest unconditionally attached session cookies to every HTTP request, ignoring credentials: omit, credentials: same-origin, credentials: include, and XMLHttpRequest.withCredentials, allowing an attacker-controlled origin in a Lightpanda session to issue authenticated cross-origin requests against a victim origin. This issue is fixed in version 0.2.9.","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":0.00234,"percentile":0.14404,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-346"],"published":"2026-07-15T16:16:07Z","modified":"2026-10-28T02:30:29Z","products":[{"vendor":"lenovo","product":"browser"},{"vendor":"lightpanda-io","product":"browser"}],"references":[{"url":"https://github.com/lightpanda-io/browser/security/advisories/GHSA-36mm-v3c2-24cc","tags":["x_refsource_CONFIRM","advisory"]},{"url":"https://github.com/lightpanda-io/browser/pull/2155","tags":["x_refsource_MISC","fix"]},{"url":"https://github.com/lightpanda-io/browser/commit/2cdaac780bed65db98bbb6ed2ad5bc6011863c76","tags":["x_refsource_MISC","fix"]},{"url":"https://github.com/lightpanda-io/browser/releases/tag/0.2.9","tags":["x_refsource_MISC","web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52843.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-52843","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-52843","title":"Lightpanda: fetch() and XMLHttpRequest attach session cookies to cross-origin requests regardless of credentials mode","description":"Lightpanda is a headless browser designed for AI and automation. Prior to 0.2.9, Lightpanda fetch() and XMLHttpRequest unconditionally attached session cookies to every HTTP request, ignoring credentials: omit, credentials: same-origin, credentials: include, and XMLHttpRequest.withCredentials, allowing an attacker-controlled origin in a Lightpanda session to issue authenticated cross-origin requests against a victim origin. This issue is fixed in version 0.2.9.","status":"published","published":"2026-07-15T16:16:07.762Z","modified":"2026-07-15T17:37:26.88Z","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-2026-44714","description":"Lightpanda is a headless browser designed for AI and automation. Prior to 0.2.9, Lightpanda fetch() and XMLHttpRequest unconditionally attached session cookies to every HTTP request, ignoring credentials: omit, credentials: same-origin, credentials: include, and XMLHttpRequest.withCredentials, allowing an attacker-controlled origin in a Lightpanda session to issue authenticated cross-origin requests against a victim origin. This issue is fixed in version 0.2.9.","status":"published","published":"2026-07-15T16:16:07Z","modified":"2026-07-15T17:37:26Z","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-2026-52843","description":"Lightpanda is a headless browser designed for AI and automation. Prior to 0.2.9, Lightpanda fetch() and XMLHttpRequest unconditionally attached session cookies to every HTTP request, ignoring credentials: omit, credentials: same-origin, credentials: include, and XMLHttpRequest.withCredentials, allowing an attacker-controlled origin in a Lightpanda session to issue authenticated cross-origin requests against a victim origin. This issue is fixed in version 0.2.9.","status":"published","published":"2026-07-15T17:16:50.467Z","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-2026-52843","title":"Lightpanda: fetch() and XMLHttpRequest attach session cookies to cross-origin requests regardless of credentials mode","description":"Lightpanda is a headless browser designed for AI and automation. Prior to 0.2.9, Lightpanda fetch() and XMLHttpRequest unconditionally attached session cookies to every HTTP request, ignoring credentials: omit, credentials: same-origin, credentials: include, and XMLHttpRequest.withCredentials, allowing an attacker-controlled origin in a Lightpanda session to issue authenticated cross-origin requests against a victim origin. This issue is fixed in version 0.2.9.","status":"published","published":"2026-07-15T16:16:07.762Z","modified":"2026-10-28T02:30:29.526352115Z","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"}]}}