CVE-2026-92811

Description

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. Attackers can 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.

References

• https://github.com/browserless/browserless
• https://github.com/browserless/browserless/blob/v2.50.1/src/browsers/browsers.cdp.ts#L105-L135
• https://github.com/browserless/browserless/blob/v2.50.1/src/browsers/browsers.playwright.ts
• https://github.com/geo-chen/oss/blob/main/browserless.md
• https://www.vulncheck.com/advisories/browserless-1.44.0-through-2.56.7-file-protocol-restriction-bypass