PatchTheCVECVE-2026-43827: Default configurations of Apache Shiro have a session fixation vulnerability. This issue affects Apache Shiro
CVE-2026-43827 is a medium-severity flaw (CVSS 6.5) affecting shiro. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- On your watchlist
A fixed release or distro patch exists.
Risk facts
| CVSS score | 6.5 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 0.4% (top 65%) |
| CISA exploited list | No |
| Weakness | CWE-384 |
| Published | 2026-05-25 |
| Last modified | 2026-07-24 |
Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-43827?
shiro: upgrade to 2.1.1. Exact commands for each OS are on this page.
Is CVE-2026-43827 being exploited?
CVE-2026-43827 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-43827 affect?
CVE-2026-43827 affects shiro. Severity is medium (CVSS 6.5). 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
How urgent is CVE-2026-43827?
Priority 37/100. On your watchlist
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