CVE-2026-52843
Critical
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.
SeverityCritical
CVSS9.3
Exploit probability—
ProductLightpanda-io Browser
PublishedJul 15, 2026
First seenJul 15, 2026
Weakness typeCWE-346CWE-346
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| lightpanda-io browser | < 0.2.9 | — |
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