EUVD-2026-44823
GHSA-45hp-h3fx-8mr2
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Legitimate shared-service user (PR:L) with no interaction; leakage is concurrency/timing-dependent (AC:H); cross-user data exposure changes scope (S:C) with high confidentiality and low integrity impact, no availability loss.
Primary rating from Vendor (CIRCL).
CVSS VectorVendor: CIRCL
Lifecycle Timeline
3DescriptionCVE.org
PlaywrightCapture stored capture-specific configuration and runtime data as mutable class-level variables rather than instance-level variables. Consequently, multiple Capture objects running within the same Python process could share state, including HTTP headers, cookies, browser storage, HTTP credentials, proxy configuration, user-agent settings, geolocation information, and captured request data.
In a multi-user or concurrent deployment, information supplied during one capture could therefore persist and be reused by a subsequent or parallel capture. This could result in the disclosure of authentication cookies, credentials, browser storage, or captured request data belonging to another user. It could also cause requests to be performed with another capture's authentication context, headers, or proxy configuration, potentially enabling unauthorized access to remote resources or interference with other capture operations.
The vulnerability is resolved by initializing all capture-specific settings and request data as instance variables in the Capture constructor, ensuring that state is isolated between capture operations.
Articles & Coverage 1
AnalysisAI
Cross-user state leakage in Lookyloo's PlaywrightCapture Python library allows one capture operation to inherit sensitive data from another when multiple Capture objects run within the same Python process. Because capture-specific settings (HTTP headers, cookies, browser storage, HTTP credentials, proxy, user-agent, geolocation) were stored as mutable class-level rather than instance-level variables, a concurrent or subsequent capture in a multi-user deployment can disclose or reuse another user's authentication cookies, credentials, and captured request data. Exploitation requires low privileges (PR:L, a legitimate user of a shared deployment); a vendor patch exists (commit 1e354b9) and no public exploit identified at time of analysis.
Technical ContextAI
PlaywrightCapture is a Python wrapper around Microsoft Playwright used by Lookyloo (CIRCL's URL/web-capture and investigation platform) to drive a headless browser and record how a page loads. The affected component is the Capture class in playwrightcapture/capture.py. The root cause is a Python object-model mistake: attributes such as _headers, _cookies, _storage, _http_credentials, _proxy, _user_agent, _geolocation, and _requests were declared as class-level attributes with mutable default values ({} / []). In Python, a class-level mutable attribute is shared by every instance until explicitly rebound, so all Capture objects living in one interpreter process referenced the same underlying dicts/lists. The vendor fix moves each of these into instance attributes assigned in __init__ (explicitly commented 'do not make them class vars!'), isolating per-capture state. The assigned CWE-613 (Insufficient Session Expiration) is an imperfect fit - the mechanism is closer to CWE-488 (Exposure of Data Element to Wrong Session) or shared mutable global state (CWE-668); the underlying issue is cross-instance state bleed, not session timeout.
RemediationAI
Upgrade to a PlaywrightCapture build that includes vendor commit 1e354b9d8566f49dbb331410be24c7c295645d43, which moves all capture-specific settings and request data into instance variables in the Capture constructor. Upstream fix available (commit); a released patched version was not independently confirmed from the provided data, so verify the pinned pip/package version actually incorporates this commit (https://github.com/Lookyloo/PlaywrightCapture/commit/1e354b9d8566f49dbb331410be24c7c295645d43). If you cannot upgrade immediately, avoid running multiple Capture objects concurrently in one shared Python process: run each capture in an isolated, short-lived worker process (one interpreter per capture) so class-level state cannot persist across users - the trade-off is higher per-capture startup cost and resource consumption. Additionally restrict the shared service to trusted users, and rotate/clear any credentials, cookies, or proxy settings that may have leaked while the vulnerable version was running, since leaked authentication material should be treated as compromised.
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Same weakness CWE-613 – Insufficient Session Expiration
View allSame technique Authentication Bypass
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External POC / Exploit Code
Leaving vuln.today