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PatchSiren cyber security CVE debrief

CVE-2026-63175 Lookyloo CVE debrief

CVE-2026-63175 is a vulnerability in PlaywrightCapture where capture-specific configuration and runtime data were stored as mutable class-level variables instead of instance-level variables. This allowed multiple Capture objects within the same Python process to share state, including sensitive information like HTTP headers, cookies, and authentication credentials. Consequently, in a multi-user or concurrent deployment, information from one capture could persist and be reused by another, potentially leading to unauthorized access or disclosure of sensitive data. The vulnerability was resolved by initializing capture-specific settings and request data as instance variables in the Capture constructor, ensuring isolated state between capture operations.

Vendor
Lookyloo
Product
PlaywrightCapture
CVSS
HIGH 7.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-15
Original CVE updated
2026-07-16
Advisory published
2026-07-15
Advisory updated
2026-07-16

Who should care

Users of PlaywrightCapture, especially those deploying it in multi-user or concurrent environments, should be aware of this vulnerability. Developers and administrators must verify if their deployments are affected and apply the necessary patches to prevent potential unauthorized access or data disclosure.

Technical summary

The PlaywrightCapture library stored capture-specific configuration and runtime data as mutable class-level variables. This meant that multiple Capture objects running within the same Python process could inadvertently share sensitive information, including HTTP headers, cookies, browser storage, HTTP credentials, proxy configuration, user-agent settings, geolocation information, and captured request data. The vulnerability, resolved in the latest version, ensures that each capture operation maintains its own isolated state by initializing these variables at the instance level.

Defensive priority

High

Recommended defensive actions

  • Verify and apply the patch to ensure capture-specific data is isolated
  • Review deployment configurations for concurrent or multi-user environments
  • Monitor for unusual activity or unauthorized access patterns
  • Implement additional security measures such as encryption and access controls
  • Regularly update PlaywrightCapture to the latest version

Evidence notes

The CVE record and NVD detail provide information on the vulnerability. A source reference points to a commit that resolves the issue. Evidence is limited to public CVE and NVD data. Defenders should verify if their PlaywrightCapture deployments are affected, focusing on multi-user or concurrent environments, and apply the patch to ensure capture-specific data isolation. Additional security measures, such as encryption and access controls, should be considered.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-63175 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-63175

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-63175 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-63175

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://github.com/Lookyloo/PlaywrightCapture/commit/1e354b9d8566f49dbb331410be24c7c295645d43

    5a6e4751-2f3f-4070-9419-94fb35b644e8

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.