CVE-2020-11020

Authentication and extension bypass in Faye

CRITICAL

9.8

CVSS Score

Published: April 29, 2020 at 05:35 PM UTC

Updated: June 17, 2026 at 02:48 AM UTC

1 product affected across 1 vendorFaye

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Severity

CRITICAL9.8

Exploit prediction

EPSS 2%

Description

Faye (NPM, RubyGem) versions greater than 0.5.0 and before 1.0.4, 1.1.3 and 1.2.5, has the potential for authentication bypass in the extension system. The vulnerability allows any client to bypass checks put in place by server-side extensions, by appending extra segments to the message channel. It is patched in versions 1.0.4, 1.1.3 and 1.2.5.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Faye · Faye Projectnpm

95%

v < 1.0.4v < 1.1.3v < 1.2.51.1.0 ≤ v < 1.1.31.2.0 ≤ v < 1.2.50.5.0 < v < 1.0.4

Affected range stops below 1.0.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.1.3, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.2.5, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_MISCPatchThird Party Advisory

Source: [email protected]

https://github.com/faye/faye/commit/65d297d341b607f3cb0b5fa6021a625a991cc30e

x_refsource_CONFIRMExploitMitigationThird Party Advisory

Source: [email protected]

https://github.com/faye/faye/security/advisories/GHSA-qpg4-4w7w-2mq5

CVSS

9.8CRITICAL[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-287

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