CVE-2026-52842
Critical
Description
Lightpanda is a headless browser designed for AI and automation. Prior to 0.3.1, Lightpanda searched for @ across the entire URL string instead of only the authority component when computing a page origin, so a URL such as `http://attacker.com/@victim.com/` was fetched from attacker.com but treated as `http://victim.com`, allowing a complete Same-Origin Policy bypass. This issue is fixed in version 0.3.1.
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 | < 0.3.1 | — |
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