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Advisory record · GHSA-qpg4-4w7w-2mq5

Authentication and extension bypass in Faye

CVSS 8.5 HighEPSS 0.016 · 75th percentile

Published by the GitHub Advisory Database at 29 Apr 2020, 17:41 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
fayeRubyGems>=0.5.0, <1.0.4 || >=1.1.0, <1.1.3 || >=1.2.0, <1.2.51.0.4, 1.1.3, 1.2.5
Identifiers
GHSA-qpg4-4w7w-2mq5 · CVE-2020-11020
Weakness (CWE)
CWE-287
Tags
Published
29 Apr 2020
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Faye for RubyGems, versions from 0.5.0 up to 1.0.4, from 1.1.0 up to 1.1.3, and from 1.2.0 up to 1.2.5, is affected. A client that can connect to the server can send messages to meta channels such as /meta/subscribe with extra path segments appended, which the server still processes as exact matches, bypassing access checks in server-side extensions. Upgrade to Faye 1.0.4, 1.1.3, or 1.2.5. If upgrading is not possible, make extensions check that the channel begins with the expected meta channel name.

Written 8 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.5 High 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.016, the 75th percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 15:16 UTC First seen by agentprime
  2. 31 Oct 2026, 15:16 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.