CVE-2026-92811 browserless CVE debrief

Who should care

Defenders responsible for browserless deployments, particularly those using Playwright websocket endpoints, should assess exposure and prioritize remediation. This includes verifying and remediating vulnerable versions, restricting access to Playwright websocket endpoints, and monitoring for suspicious activity. Operators, platform administrators, vulnerability management teams, and security teams should review the supplied official advisory or CVE record

Why it matters

CVE-2026-92811 allows authenticated token holders to read arbitrary files due to browserless failing to enforce file protocol restrictions in Playwright websocket endpoints. Defenders should verify and remediate vulnerable versions, restrict access to Playwright websocket endpoints, and monitor for suspicious activity.

• Verify file access restrictions are in place for Playwright websocket endpoints.
• Assess exposure of sensitive files to authenticated token holders.
• Remediate vulnerable browserless versions to prevent file protocol exploitation.
• Monitor for suspicious activity related to file protocol exploitation.

Technical summary

browserless versions 1.44.0 through 2.56.7 fail to enforce file protocol restrictions in Playwright websocket endpoints, allowing authenticated token holders to read arbitrary files. This vulnerability allows attackers to navigate Playwright-driven browsers to file scheme URLs and access files accessible to the container process despite the ALLOW_FILE_PROTOCOL setting defaulting to false. The affected product context indicates that defenders should prioritize verifying and remediating browserless versions 1.44.0 through 2.56.7, as they are potentially vulnerable to file protocol restriction bypass.

Defensive priority

Defenders should prioritize verifying and remediating browserless versions 1.44.0 through 2.56.7, as they are potentially vulnerable to file protocol restriction bypass.

Recommended defensive actions

• Verify browserless versions 1.44.0 through 2.56.7 are not in use or have been remediated.
• Restrict access to Playwright websocket endpoints to prevent unauthorized file access.
• Monitor for suspicious activity related to file protocol exploitation.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The CVE record and source references indicate that browserless versions 1.44.0 through 2.56.7 fail to enforce file protocol restrictions in Playwright websocket endpoints, allowing authenticated token holders to read arbitrary files.

Sources and references

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.