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Advisory record · GHSA-c244-p6m5-vqj6

Apache Shiro has an Authentication Bypass

CVSS 5.3 MediumEPSS 0.0040 · 34th percentile

Published by the GitHub Advisory Database at 9 Feb 2026, 12:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.apache.shiro:shiro-springMaven<2.1.02.1.0
Identifiers
GHSA-c244-p6m5-vqj6 · CVE-2026-23903
Weakness (CWE)
CWE-289
Tags
Published
9 Feb 2026
Updated
10 Sept 2026

Machine-written summary

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

Apache Shiro (org.apache.shiro:shiro-spring) versions before 2.1.0 are affected. An attacker can bypass authentication for static files on case-insensitive filesystems, such as macOS or Windows, by changing the capitalization of the requested filename when Shiro filter rules use lower-case paths. Upgrade to version 2.1.0 or later, then enable the new case-insensitivity setting described in the advisory, since it must be turned on manually in 2.1.0.

Written 2 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
5.3 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS 0.0040, the 34th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:17 UTC First seen by agentprime
  2. 31 Oct 2026, 14:17 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.