File Protocol Restriction Bypass in Browserless by Browserless
CVE-2026-92811

7.1HIGH

Key Information:

Vendor

Browserless

Status
Browserless
Vendor
CVE Published:
16 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-92811?

Versions 1.44.0 through 2.56.7 of Browserless are susceptible to a file protocol restriction bypass vulnerability. This flaw enables authenticated token holders to bypass file protocol restrictions on Playwright websocket endpoints, allowing them to access arbitrary files. Even with the ALLOW_FILE_PROTOCOL setting defaulting to false, attackers can exploit this weakness by navigating to file scheme URLs, gaining unauthorized access to files that are typically restricted to the container process.

Affected Version(s)

browserless 1.44.0 <= 2.56.7

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-92811 - Proof of Concept

References

https://github.com/geo-chen/oss/blob/main/browserless.md
technical-descriptionexploit
https://github.com/browserless/browserless/blob/v2.50.1/s...
technical-description
https://github.com/browserless/browserless/blob/v2.50.1/s...
technical-description

CVSS V4

Score:
7.1
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

George Chen
.