Executive brief
PlaywrightCapture, a library used for capturing web content, contains a flaw where it fails to properly separate data between different capture tasks. In environments where multiple captures happen at once, sensitive information like login cookies, passwords, and private browsing data from one user could be leaked to another. This could allow an attacker to hijack sessions or access restricted web resources by piggybacking on another user's active connection.
Technical details
The vulnerability arises from the use of mutable class-level variables (such as _headers, _cookies, and _requests) instead of instance-level variables within the Capture class. In multi-user or concurrent Python deployments, multiple Capture objects share the same memory space for these variables, leading to state pollution. An attacker or a concurrent process could inadvertently access or reuse authentication headers, cookies, proxy configurations, and captured request data belonging to a different session. The issue is resolved by moving these variables into the __init__ constructor to ensure proper instance isolation.
Affected products
- Lookyloo PlaywrightCapture <= v1.40.2
Timeline
- 2026-07-15: advisory: NVD publication date
- 2026-07-15: patched: Fix committed to repository