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CVE-2026-43827

Apache Shiro: Session fixation: new session is not created after login by default

5.9 MediumFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
Active

What an attacker can affect

Confidentiality
High
Integrity
None
Availability
None

Exploit likelihood

0.41%Up 0.4 points since May 26, 2026
90%50%10%1%

What each source reports

CVE List Score used 5.9

Apache Shiro: Session fixation: new session is not created after login by default

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.

Record
CVE-2026-43827
CVSS 4.0
5.9 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N/AU:Y/R:U/RE:L/U:Amber
Weakness
CWE-384
Updated
2026-11-02
EUVDEUVD-2026-31736 5.9

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.

Record
EUVD-2026-31736
CVSS 4.0
5.9 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N/AU:Y/R:U/RE:L/U:Amber
Updated
2026-11-02
GitHub AdvisoriesGHSA-fcvm-3cpj-f9qx 5.9

Apache Shiro has a session fixation vulnerability

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.

Record
GHSA-fcvm-3cpj-f9qx
CVSS 4.0
5.9 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N/RE:L/U:Amber
Weakness
CWE-384
Updated
2026-11-02
NVD 5.9

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.

Record
CVE-2026-43827
CVSS 4.0
5.9 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:U/V:X/RE:L/U:Amber
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Weakness
CWE-384
Updated
2026-11-02
OSVDEBIAN-CVE-2026-43827 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 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.

Record
DEBIAN-CVE-2026-43827
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Updated
2026-11-02
OSVGHSA-fcvm-3cpj-f9qx 5.9

Apache Shiro has a session fixation vulnerability

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.

Record
GHSA-fcvm-3cpj-f9qx
CVSS 4.0
5.9 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N/RE:L/U:Amber
Weakness
CWE-384
Updated
2026-11-02
OSVUBUNTU-CVE-2026-43827 5.9

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.

Record
UBUNTU-CVE-2026-43827
CVSS 4.0
5.9 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N/AU:Y/R:U/RE:L/U:Amber
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
org.apache.shiro:shiro-core
Maven
 1.0.0-incubating up to 2.2.0
2.2.0
org.apache.shiro:shiro-core
Maven
 3.0.0-alpha-1 to 3.0.0-alpha-1
3.0.0-alpha-2
shiro
Debian:12
 All versions, plus listed versions
1.3.2-51.3.2-6
 None known
shiro
Debian:13
 All versions, plus listed versions
1.3.2-6
 None known
shiro
Debian:14
 All versions, plus listed versions
1.3.2-6
 None known
org.apache.shiro:shiro-core
Maven
 1.0.0-incubating up to 2.2.0, plus listed versions
1.1.01.10.01.10.11.11.01.12.0
Show 37 moreShow less
1.13.01.2.01.2.11.2.21.2.31.2.41.2.51.2.61.3.01.3.11.3.21.4.01.4.0-RC21.4.11.4.21.5.01.5.11.5.21.5.31.6.01.7.01.7.11.8.01.9.01.9.12.0.02.0.0-alpha-12.0.0-alpha-22.0.0-alpha-32.0.0-alpha-42.0.12.0.22.0.32.0.42.0.52.0.62.1.0
2.2.0
org.apache.shiro:shiro-core
Maven
 3.0.0-alpha-1 up to 3.0.0-alpha-2
3.0.0-alpha-2
shiro
Ubuntu:Pro:16.04:LTS
 All versions, plus listed versions
1.2.4-11.2.4-1ubuntu0.1~esm11.2.4-1ubuntu0.1~esm2
 None known
shiro
Ubuntu:Pro:18.04:LTS
 All versions, plus listed versions
1.3.2-21.3.2-3~18.041.3.2-3~18.04.11.3.2-3ubuntu0.18.04.1~esm1
 None known
shiro
Ubuntu:20.04:LTS
 All versions, plus listed versions
1.3.2-41.3.2-4ubuntu0.11.3.2-4ubuntu0.2
 None known
Show 5 moreShow less
Affected packages
PackageAffectedFixed
shiro
Ubuntu:22.04:LTS
 All versions, plus listed versions
1.3.2-41.3.2-5
 None known
shiro
Ubuntu:Pro:24.04:LTS
 All versions, plus listed versions
1.3.2-51.3.2-5ubuntu0.24.04.1~esm1
 None known
shiro
Ubuntu:25.10
 All versions, plus listed versions
1.3.2-6ubuntu1
 None known
shiro
Ubuntu:26.10
 All versions, plus listed versions
1.3.2-6ubuntu2
 None known
shiro
Ubuntu:26.04:LTS
 All versions, plus listed versions
1.3.2-6ubuntu11.3.2-6ubuntu2
 None known

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-43827 is a medium vulnerability (CVSS 5.9) in Apache Shiro, published May 25, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.41%, the 35th percentile. Fixed in org.apache.shiro:shiro-core 2.2.0.

References

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