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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
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.
- Record
CVE-2026-52842- CVSS 3.1
- 9.3 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N - Weakness
- CWE-346
- Updated
- 2026-11-02
EUVDEUVD-2026-44720
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.
- Record
EUVD-2026-44720- CVSS 3.1
- 9.3 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N - Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-52842- CVSS 3.1
- 9.3 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N - Weakness
- CWE-346
- Updated
- 2026-11-02
OSV
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.
- Record
CVE-2026-52842- CVSS 3.1
- 9.3 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N - Weakness
- CWE-346
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-52842 is a critical vulnerability (CVSS 9.3) in Lenovo Browser, published July 15, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.25%, the 15th percentile. No source names a fixed version.
References
github.com/lightpanda-io/browser/security/advisories/GHSA-mq6p-m9cc-q432
nvd.nist.gov/vuln/detail/CVE-2026-52842