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Advisory record · GHSA-328g-jx67-v94g

Tinyauth: forward-auth per-app ACL is matched case-sensitively against the (case-insensitive) hostname, letting an authenticated user reach apps they are not on the allowlist for

CVSS 8.1 HighEPSS 0.0061 · 49th percentile

Published by the GitHub Advisory Database at 22 Sept 2026, 20:37 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/tinyauthapp/tinyauthGo<1.0.1-0.20260720133915-80bc87188ec31.0.1-0.20260720133915-80bc87188ec3
Identifiers
GHSA-328g-jx67-v94g · CVE-2026-77560 · GO-2026-6552
Weakness (CWE)
CWE-178 · CWE-636 · CWE-863
Tags
Published
22 Sept 2026
Updated
1 Oct 2026

Machine-written summary

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

tinyauth versions before 1.0.1-0.20260720133915-80bc87188ec3 match per-app access rules case-sensitively against hostnames. An authenticated user can request an app using a differently cased hostname to bypass its user, group and IP allowlists. Upgrade to 1.0.1-0.20260720133915-80bc87188ec3 or later.

Written 1 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
8.1 High 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0061, the 49th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:12 UTC First seen by agentprime
  2. 31 Oct 2026, 14:12 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.