{"id":"CVE-2026-52843","state":"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.","publishedAt":"2026-07-15T16:16:07.762Z","updatedAt":"2026-07-15T17:37:26.880Z","severity":{"score":9.3,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["lightpanda-io browser"],"affected":[{"vendor":"lightpanda-io","product":"browser","versions":[{"version":"< 0.2.9","status":"affected"}]}],"references":["https://github.com/lightpanda-io/browser/security/advisories/GHSA-36mm-v3c2-24cc","https://github.com/lightpanda-io/browser/pull/2155","https://github.com/lightpanda-io/browser/commit/2cdaac780bed65db98bbb6ed2ad5bc6011863c76","https://github.com/lightpanda-io/browser/releases/tag/0.2.9"],"weaknesses":["CWE-346"],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/52xxx/CVE-2026-52843.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-52843","state":"PUBLISHED","datePublished":"2026-07-15T16:16:07.762Z","dateUpdated":"2026-07-15T17:37:26.880Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-08T18:41:27.724Z"},"containers":{"cna":{"title":"Lightpanda: fetch() and XMLHttpRequest attach session cookies to cross-origin requests regardless of credentials mode","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"lightpanda-io","product":"browser","versions":[{"version":"< 0.2.9","status":"affected"}]}],"references":[{"url":"https://github.com/lightpanda-io/browser/security/advisories/GHSA-36mm-v3c2-24cc","name":"https://github.com/lightpanda-io/browser/security/advisories/GHSA-36mm-v3c2-24cc","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/lightpanda-io/browser/pull/2155","name":"https://github.com/lightpanda-io/browser/pull/2155","tags":["x_refsource_MISC"]},{"url":"https://github.com/lightpanda-io/browser/commit/2cdaac780bed65db98bbb6ed2ad5bc6011863c76","name":"https://github.com/lightpanda-io/browser/commit/2cdaac780bed65db98bbb6ed2ad5bc6011863c76","tags":["x_refsource_MISC"]},{"url":"https://github.com/lightpanda-io/browser/releases/tag/0.2.9","name":"https://github.com/lightpanda-io/browser/releases/tag/0.2.9","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":9.3,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-346","lang":"en","description":"CWE-346: Origin Validation Error","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-07-15T16:16:07.762Z"},"source":{"advisory":"GHSA-36mm-v3c2-24cc","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-15T17:37:05.863200Z","id":"CVE-2026-52843","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-15T17:37:26.880Z"}}]}}}