Critical 9.3Published Jul 15, 2026

CVE-2026-52842Lightpanda:URL parser misidentifies page origin for URLs containing @ in the path - Same-Origin Policy bypass

Updated under an hour ago (Oct 26, 2026, 8:23 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 9.3 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Weakness (CWE): CWE-346
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Jul 15, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

lightpanda-io browser lightpanda_io:browser (from the name)	before 0.3.1	CNA record

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.