{"id":"CVE-2026-52843","summary":"Lightpanda: fetch() and XMLHttpRequest attach session cookies to cross-origin requests regardless of credentials mode","details":"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.","aliases":["GHSA-36mm-v3c2-24cc"],"modified":"2026-07-17T03:47:07.973613685Z","published":"2026-07-15T16:16:07.762Z","database_specific":{"cwe_ids":["CWE-346"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52843.json","cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/lightpanda-io/browser/releases/tag/0.2.9"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52843.json"},{"type":"ADVISORY","url":"https://github.com/lightpanda-io/browser/security/advisories/GHSA-36mm-v3c2-24cc"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-52843"},{"type":"FIX","url":"https://github.com/lightpanda-io/browser/commit/2cdaac780bed65db98bbb6ed2ad5bc6011863c76"},{"type":"FIX","url":"https://github.com/lightpanda-io/browser/pull/2155"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/lightpanda-io/browser","events":[{"introduced":"0"},{"fixed":"2cdaac780bed65db98bbb6ed2ad5bc6011863c76"},{"fixed":"b2b1302fa2638bcc295c6ad0d9a71bf9aa75adb1"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"0.2.9"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["0.2.8","0.2.7","v0.2.6","v0.2.5","v0.2.4","v0.2.3","v0.2.2","v0.2.1","v0.2.0","beta","nightly","alpha"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52843.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N"}]}