Authentication Bypass Affecting shiro package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIANUNSTABLE-SHIRO-17662100
- published29 Jun 2026
- disclosed25 Jun 2026
Introduced: 25 Jun 2026
CVE-2026-56091 (opens in a new tab)How to fix?
There is no fixed version for Debian:unstable shiro.
NVD Description
Note: Versions mentioned in the description apply only to the upstream shiro package and not the shiro package as distributed by Debian.
See How to fix? for Debian:unstable relevant fixed versions and status.
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.