CVE-2026-52842

critical · 9.3

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.

9.3

CVSS

0.2%

EPSS (exploit prob.)

16th

EPSS percentile

2026-07-15

Published

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

Weaknesses

CWE-346

References

https://github.com/lightpanda-io/browser/commit/0588cc374d4af9687cf6f45a7d52f7af04bbacfb
https://github.com/lightpanda-io/browser/pull/1998
https://github.com/lightpanda-io/browser/releases/tag/0.3.1
https://github.com/lightpanda-io/browser/security/advisories/GHSA-mq6p-m9cc-q432

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-52842