Vulnerability details
CVE-2026-56091
Apache Software Foundation Apache Shiro
Apache Shiro: Authentication bypass in Guice-Web integration
CVSS 4.0
8.2High
Official description
When using Apache Shiro with the shiro-guice module in a web servlet context, a specially crafted HTTP request may cause an authentication bypass. This vulnerability is similar to https://www.cve.org/CVERecord?id=CVE-2020-1957 https://www.cve.org/CVERecord , except that it affects the `shiro-guice` module instead of the `shiro-spring` module. This issue affects all Apache Shiro versions through 2.x, and 3.0.0-alpha-1 only when using `shiro-guice` module in a web servlet context. Upgrade to version 3.0.0 or later, which fixes the issue.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.2High | 4.0 | CVEProject cvelistV5 (CNA) (apache) | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/S:P/AU:Y/V:D/RE:L/U:Amber |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Apache Software Foundation | Apache Shiro | v ≤ 2.99.99 | CVEProject cvelistV5 (CNA) |
| Apache Software Foundation | Apache Shiro | 3.0.0-alpha-0 ≤ v ≤ 3.0.0-alpha-1 | CVEProject cvelistV5 (CNA) |
References and advisories
1- https://lists.apache.org/thread/onmtxmy2qonbpx7xlw3o34x8sctv47r7 vendor-advisory
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Details
- Published
- 2026-06-25
- Last updated
- 2026-06-25
- State
- Published
- Assigner (CNA)
- apache
Exploit prediction (EPSS)
0.66%
Probability of exploitation in 30 days
52.1%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-289Authentication Bypass by Alternate Name