by Kastro
Paper/Archive/CVE-2026-52843

CVE-2026-52843

lightpanda-io browser — Lightpanda: fetch() and XMLHttpRequest attach session cookies to cross-origin requests regardless of credentials mode

EPSS 0.2%CVSS 9.3
critical.is priorityof 100
31
CVSS 9.3 (CNA)9.3 / 10 × 3027.9Not in CISA KEV+300.0EPSS percentile 14.4.144 × 202.9No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
browser< 0.2.9–CNA

Scores by source

GitHub_M (CNA)9.3CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refgithub.com/lightpanda-io/browser/security/advisories/GHSA-36mm-v3c2-24ccrefgithub.com/lightpanda-io/browser/pull/2155refgithub.com/lightpanda-io/browser/commit/2cdaac780bed65db98bbb6ed2ad5bc6011863c76refgithub.com/lightpanda-io/browser/releases/tag/0.2.9