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CVE-2026-23903 Apache Shiro

Affected softwareApache Shiro
Severity5.3 Medium CVSS 3.1
Fixed in2.1.0
WeaknessCWE-289
Published9 Feb 2026
Updated20 Aug 2026

Description

Authentication Bypass by Alternate Name vulnerability in Apache Shiro. This issue affects Apache Shiro: before 2.0.7. Users are recommended to upgrade to version 2.0.7, which fixes the issue. The issue only effects static files. If static files are served from a case-insensitive filesystem, such as default macOS setup, static files may be accessed by varying the case of the filename in the request. If only lower-case (common default) filters are present in Shiro, they may be bypassed this way. Shiro 2.1.0 and later has a new parameters to remediate this issue shiro.ini: filterChainResolver.caseInsensitive = true application.properties: shiro.caseInsensitive=true Shiro 3.0.0 and later makes this the default in shiro.ini-based configurations. Shiro 3.0.1 and later makes this the default in all configurations, including programmatic and Spring / Spring Boot.

Exploitation status

No public exploit

No exploit has been reported in the sources we check.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: none
  • Indexed PoC none indexed
  • EPSS 0.40% chance in 30 days

Waratek protection

No exploit published

Within Waratek scope. In the sources we check, nobody has published exploit code for this CVE or reported it being exploited.

A public code fix exists: apache/shiro 3b9638b.

  • Protection none
  • Action unverified
  • Review automated Upstream data
  • Record active
Decided by Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all
Finding This CVE is not listed in CISA KEV or VulnCheck KEV, CISA Vulnrichment records no active exploitation, no reviewed exploit catalogue carries an entry for it, and no GitHub PoC repository for it has 5 or more stars. Nobody has published exploit code worth tracing, so it is not a candidate for a rule ahead of the ones where somebody has; an upstream fix path does exist, so the remediation half of the candidacy still holds. This is a statement about what has been published, not about whether the defect is reachable or serious.

Affected software and releases

Oracle advisories

AdvisoryTypeQuarterProducts Oracle names in its risk matrix
Oracle Critical Patch Update July 2026 ↗ CPU 2026-Q3 Oracle Communications / Core (Apache Shiro) (6.1.1-7.0.0)
Oracle Critical Patch Update April 2026 ↗ CPU 2026-Q2 Oracle Communications / Third Party (Apache Shiro) (9.0.0-9.0.4)
Oracle Communications / Third Party (Apache Shiro) (9.0.0-9.0.4)

Oracle components and versions

FamilyComponentVersions, as Oracle lists themRead as
Oracle Communications Core (Apache Shiro) 6.1.1-7.0.0
Oracle Communications Third Party (Apache Shiro) 9.0.0-9.0.4

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
org.apache.shiro:shiro-spring 0 2.1.0 unbounded

Products and versions

2 products, 2 version entries
SourceVendorProductSchemeAffected versions
nvd apache shiro generic < 2.0.7
osv org.apache.shiro shiro-spring generic < 2.1.0

References

URLTags
https://github.com/apache/shiro/commit/3b9638b957495004599aeaf24ba8949e309f26e8 WEB
https://github.com/apache/shiro PACKAGE
https://lists.apache.org/thread/5jjf0hnjcol58z2m5y255c7scz1lnp8k WEB
http://www.openwall.com/lists/oss-security/2026/02/08/1 WEB

Timeline

Published2026-02-09By the CVE Program.
NVD record modified2026-08-20NVD's own last-modified date for this record.