6.5

CVE-2026-43827: apache software foundation apache shiro Session Fixation

CVSS: 6.5v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-43827DEBIAN-CVE-2026-43827CGA-9x6c-r599-fr28
Published 25-05-2026Last modified 26-05-2026
Open JSON

Vulnerability summary

CVE-2026-43827 is a medium (CVSS 6.5) Session Fixation vulnerability in apache software foundation apache shiro. EPSS estimates a 0.53% chance of exploitation in the next 30 days, higher than 43.6% of scored vulnerabilities.

Overall risk
26/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.53%
0%100%
Low · +0.12 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 25-05-2026
    PublishedVulnerability first disclosed.
  2. 26-05-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

9 scores · 7 sources · 2 versions

EPSS trend

Probability

0.53%

Chance of exploitation in the next 30 days

Percentile

44%

Versus all other CVEs

30-day change

+0.12 pp

From 0.41% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.53%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard11 products
  • apache-activemq-5.19All versions (No fix recorded)
  • apache-activemq-6.1All versions (No fix recorded)
  • apache-activemq-fips-5.19All versions (No fix recorded)
  • apache-activemq-fips-6.1All versions (No fix recorded)
  • neo4j-2025.11All versions (No fix recorded)
Wolfi2 products
  • neo4j-2025.12All versions (No fix recorded)
  • neo4j-2026.01All versions (No fix recorded)
Apache1 product
  • shiro< 2.1.1 | 3.0.0:alpha1
Apache software foundation1 product
  • apache shiro≥ 1.0, ≤ 2.1.0 | ≥ 3.0.0-alpha-0, ≤ 3.0.0-alpha-1
Debian1 product
  • shiroAll versions (No fix recorded)
Org.apache.shiro1 product
  • shiro-core≥ 1.0.0-incubating, < 2.2.0 | ≥ 3.0.0-alpha-1, < 3.0.0-alpha-2
Ubuntu1 product
  • shiroAll versions (No fix recorded)

7 vendors · 18 products

References

8 links