CVE-2026-80195: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-fcv9-h6ph-8mrc
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CVSS 5.4
CWE-841
Published
Advisory Summary

CVE-2026-80195 is a HIGH (CVSS 5.4) security vulnerability vulnerability (CWE-841: Improper Enforcement of Behavioral Workflow) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product supports a session in which more than one behavior must be performed by an actor, but it does not properly ensure that the actor performs the behaviors in the required sequence.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-80195 at a Glance

CVE Identifier CVE-2026-80195
GHSA Identifier GHSA-fcv9-h6ph-8mrc
Severity HIGH
CVSS v3.1 Base Score 5.4
CWE Classification CWE-841: Improper Enforcement of Behavioral Workflow
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 5.4

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity Low (I:L)
Availability Low (A:L)

How to Fix CVE-2026-80195

To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-80195, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-841: Improper Enforcement of Behavioral Workflow, where the product supports a session in which more than one behavior must be performed by an actor, but it does not properly ensure that the actor performs the behaviors in the required sequence. In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

Kimai before 2.63.0 contains a business logic / improper authorization vulnerability in the team update API endpoint (PATCH /api/teams/{id}), which removes all existing team members before validating the submitted replacement member list. An authenticated teamlead (or other user) with permission to edit a team can submit a malformed members payload; although Kimai returns a validation error, the existing membership rows have already been deleted. This bypasses the dedicated member-removal endpoint's protection against removing teamleaders and can leave a team with no members or teamleaders, disrupting team-based access control.

References

GitHub Advisory / Wiki ADVISORY
https://github.com/kimai/kimai/security/advisories/GHSA-6rxf-4hh9-pp46
NVD — CVE-2026-80195 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-80195
www.vulncheck.com/advisories/kimai-be... WEB
https://www.vulncheck.com/advisories/kimai-before-2.63.0-team-membership-removal-via-api

Frequently Asked Questions

What is CVE-2026-80195?
CVE-2026-80195 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-841: Improper Enforcement of Behavioral Workflow.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-80195?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-80195?
CVE-2026-80195 has a CVSS v3.1 base score of 5.4 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L.
What CWE is associated with CVE-2026-80195?
CVE-2026-80195 is classified under CWE-841: Improper Enforcement of Behavioral Workflow (The product supports a session in which more than one behavior must be performed by an actor, but it does not properly ensure that the actor performs the behaviors in the required sequence.).
How can I check Maven dependencies for CVE-2026-80195?
Run the dependency tree command: 'mvn dependency:tree'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-fcv9-h6ph-8mrc",
  "modified" : "2026-08-26T18:31:52Z",
  "published" : "2026-08-26T18:31:52Z",
  "aliases" : [ "CVE-2026-80195" ],
  "details" : "Kimai before 2.63.0 contains a business logic / improper authorization vulnerability in the team update API endpoint (PATCH /api/teams/{id}), which removes all existing team members before validating the submitted replacement member list. An authenticated teamlead (or other user) with permission to edit a team can submit a malformed members payload; although Kimai returns a validation error, the existing membership rows have already been deleted. This bypasses the dedicated member-removal endpoint's protection against removing teamleaders and can leave a team with no members or teamleaders, disrupting team-based access control.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/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:X/R:X/V:X/RE:X/U:X"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/kimai/kimai/security/advisories/GHSA-6rxf-4hh9-pp46"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-80195"
  }, {
    "type" : "WEB",
    "url" : "https://www.vulncheck.com/advisories/kimai-before-2.63.0-team-membership-removal-via-api"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-841" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-08-26T05:18:26Z"
  }
}