CVE-2026-23903
Last modified
CVE-2026-23903 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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 2.0.7 and later has a new parameters to remediate this issue shiro.ini: filterChainResolver.caseInsensitive = true application.propertie: shiro.caseInsensitive=true Shiro 3.0.0 and later (upcoming) makes this the default.. EPSS estimates a 0.36% chance of exploitation in the next 30 days.
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 2.0.7 and later has a new parameters to remediate this issue shiro.ini: filterChainResolver.caseInsensitive = true application.propertie: shiro.caseInsensitive=true Shiro 3.0.0 and later (upcoming) makes this the default.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Apache | Shiro | < 2.0.7 |
References
- https://lists.apache.org/thread/5jjf0hnjcol58z2m5y255c7scz1lnp8kMailing List, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2026/02/08/1Mailing List, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-23903?
How severe is CVE-2026-23903?
How do I fix CVE-2026-23903?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-23897Apollo Server is an open-source, spec-compliant GraphQL serv…7.5
- CVE-2026-23898Lack of input validation leads to an arbitrary file deletion…7.2
- CVE-2026-23899An improper access check allows unauthorized access to webse…8.8
- CVE-2026-23900Various stored XSS vulnerabilities in the maps- and icon ren…6.5
- CVE-2026-23901Observable Timing Discrepancy vulnerability in Apache Shiro.…2.5
- CVE-2026-23902Incorrect Authorization vulnerability in Apache DolphinSched…8.1
- CVE-2026-23904Kyuubi Engine UI proxy accepts a host and port from the requ…7.3
- CVE-2026-23906Affected Products and Versions * Apache Druid * Affect…9.8
- CVE-2026-23907This issue affects the ExtractEmbeddedFiles example in Apac…5.3
- CVE-2026-23909Rejected reason: Not used
- CVE-2026-2391### Summary The `arrayLimit` option in qs does not enforce l…7.5
- CVE-2026-23910Rejected reason: Not used
Are you affected by CVE-2026-23903?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST