Description
Default configurations of Apache Shiro have a session fixation vulnerability.
This issue affects Apache Shiro from 1.0 to 2.1.0, and 3.0.0-alpha-1.
Users are recommended to upgrade to version 2.1.1, or 3.0.0-alpha-2 or later, which fixes the issue.
In the affected versions, when a session already exists, it is not invalidated upon successful login, nor is a new session being generated with a new ID.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache Software Foundation | Apache Shiro | 1.0 – ≤ 2.1.0, 3.0.0-alpha-0 – ≤ 3.0.0-alpha-1 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | shiro | No fix yet | — |
| Debian 13 | shiro | No fix yet | — |
| Debian 12 | shiro | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | shiro | No fix yet | — |
| Ubuntu 26.04 LTS | shiro | No fix yet | — |
| Ubuntu 25.10 | shiro | No fix yet | — |
| Ubuntu 22.04 LTS | shiro | No fix yet | — |
| Ubuntu 20.04 LTS | shiro | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 24.04 LTS | shiro | No fix yet | — |
| Ubuntu Pro 18.04 LTS | shiro | No fix yet | — |
| Ubuntu Pro 16.04 LTS | shiro | No fix yet | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | neo4j-2026.01 | No fix yet | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Maven | org.apache.shiro:shiro-core | >= 1.0.0-incubating, < 2.2.0 | 2.2.0 | GHSA-fcvm-3cpj-f9qx |
| Maven | org.apache.shiro:shiro-core | >= 3.0.0-alpha-1, < 3.0.0-alpha-2 | 3.0.0-alpha-2 | GHSA-fcvm-3cpj-f9qx |
References
- https://shiro.apache.org/security-reports.html#cve_2026_43827 vendor-advisory