CVE-2021-3963: Kevinpapst/kimai2 Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-gf2c-93hm-r9j5
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CVSS 4.3
CWE-352
Published
Advisory Summary

CVE-2021-3963 is a MODERATE (CVSS 4.3) cross-site scripting vulnerability (CWE-352: Cross-Site Request Forgery (CSRF)) affecting Kevinpapst/kimai2 libraries in the Packagist ecosystem. The issue involves cross-site scripting in kimai2. Remediation is available by upgrading affected packages to version 1.16.

CVE-2021-3963 at a Glance

CVE Identifier CVE-2021-3963
GHSA Identifier GHSA-gf2c-93hm-r9j5
Severity MODERATE
CVSS v3.1 Base Score 4.3
CWE Classification CWE-352: Cross-Site Request Forgery (CSRF)
Affected Product Kevinpapst/kimai2
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 4.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N).

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

How to Fix CVE-2021-3963

To remediate this vulnerability, upgrade all affected Kevinpapst/kimai2 dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

kevinpapst/kimai2 fixed: 1.16 
Upgrade kevinpapst/kimai2 to 1.16
Verify Direct and Transitive Dependencies

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

inspect dependencies for kevinpapst/kimai2

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-3963, inspect your project dependencies for Kevinpapst/kimai2:

inspect dependencies for kevinpapst/kimai2

Analyze the terminal output to locate any version of Kevinpapst/kimai2 in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.16), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-352: Cross-Site Request Forgery (CSRF), where the web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor. In Kevinpapst/kimai2, 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

kimai2 is vulnerable to Cross-Site Request Forgery (CSRF) in deleting invoice templates. This vulnerability is capable of tricking admin user to delete invoice templates.

CVE-2021-3963 Affected Kevinpapst/kimai2 Versions

1 component(s)
Fixed Versions:
1.16
Product / Package Ecosystem Affected Versions Fixed Version
kevinpapst/kimai2
 Packagist
< 1.16
1.16

References

NVD — CVE-2021-3963 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-3963
Security Fix Commit FIX COMMIT
https://github.com/kevinpapst/kimai2/commit/95796ab2560ad93f44068a88f0fad758c2053514
huntr.dev/bounties/3abf308b-7... WEB
https://huntr.dev/bounties/3abf308b-7dbd-4864-b1a9-5c45b876def8

Frequently Asked Questions

What is CVE-2021-3963?
CVE-2021-3963 is a security vulnerability in Kevinpapst/kimai2 involving Cross-site Scripting in kimai2 under CWE-352: Cross-Site Request Forgery (CSRF).
Which Kevinpapst/kimai2 versions are affected?
Affected versions include releases prior to 1.16 across affected packages: kevinpapst/kimai2.
What version fixes CVE-2021-3963?
Upgrading to 1.16 (or the latest patched release for your respective branch) resolves the vulnerability.
Is kevinpapst/kimai2 affected?
Yes, kevinpapst/kimai2 is affected in releases prior to 1.16. Upgrade your dependency to 1.16 or later.
What is the CVSS score of CVE-2021-3963?
CVE-2021-3963 has a CVSS v3.1 base score of 4.3 (MODERATE) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.
What CWE is associated with CVE-2021-3963?
CVE-2021-3963 is classified under CWE-352: Cross-Site Request Forgery (CSRF) (The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.).
How can I check Packagist dependencies for CVE-2021-3963?
Run the dependency tree command: 'inspect dependencies for kevinpapst/kimai2'. 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-gf2c-93hm-r9j5",
  "modified" : "2021-11-22T18:42:37Z",
  "published" : "2021-11-23T18:16:43Z",
  "aliases" : [ "CVE-2021-3963" ],
  "summary" : "Cross-site Scripting in kimai2",
  "details" : "kimai2 is vulnerable to Cross-Site Request Forgery (CSRF) in deleting invoice templates. This vulnerability is capable of tricking admin user to delete invoice templates.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "kevinpapst/kimai2"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.16"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-3963"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/kevinpapst/kimai2/commit/95796ab2560ad93f44068a88f0fad758c2053514"
  }, {
    "type" : "WEB",
    "url" : "https://huntr.dev/bounties/3abf308b-7dbd-4864-b1a9-5c45b876def8"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-352" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-11-22T18:42:37Z",
    "nvd_published_at" : "2021-11-19T12:15:00Z"
  }
}