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CVE

CVE-2026-52842

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

CVE-2026-52842

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

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.3
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
C
H
U
-

Related Resources

No items found.

References

https://github.com/lightpanda-io/browser/releases/tag/0.3.1, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52842.json, https://github.com/lightpanda-io/browser/security/advisories/GHSA-mq6p-m9cc-q432, https://nvd.nist.gov/vuln/detail/CVE-2026-52842, https://github.com/lightpanda-io/browser/commit/0588cc374d4af9687cf6f45a7d52f7af04bbacfb, https://github.com/lightpanda-io/browser/pull/1998

Severity

9.3

CVSS Score
0
10

Basic Information

Base CVSS
9.3
EPSS Probability
0.00246%
EPSS Percentile
0.15676%
Introduced Version
0
Fix Available
85d84c296ed592a0a924c8dee3426dbf7881b560

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