CVE-2021-21676: Missing permission check in Jenkins requests-plugin Plugin allows sending emails

org.jenkins-ci.plugins:requests Updated 02 Oct 2025

Summary

24/05/2022

Disclosed on

CVE-2021-21676

CVE

Yes i

Fix available

Moderate

Severity

4.3

CVSS Score

CVE-2021-21676: Missing permission check in Jenkins requests-plugin Plugin allows sending emails. Affects org.jenkins-ci.plugins:requests versions < 2.2.8. Fixed in 2.2.8. How to fix ↓

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Background

The requests-plugin is a plugin for Jenkins, an open-source automation server. It provides functionality for sending HTTP requests as part of Jenkins job workflows. The plugin allows users to configure and send requests to external systems, such as APIs or web services, during the execution of Jenkins jobs. This enables integration with various external tools and services. However, versions 2.2.7 and earlier of the requests-plugin suffer from a vulnerability that allows attackers with Overall/Read permission to send test emails to an attacker-specified email address.

Vulnerability Detail

The vulnerability in the requests-plugin (versions 2.2.7 and earlier) arises from the lack of a permission check in an HTTP endpoint. This means that any user with Overall/Read permission can exploit the vulnerability to send test emails to an email address specified by the attacker. The impact of this vulnerability is limited to the ability to send test emails, but it can still be abused for malicious purposes. The vulnerability has a CVSS score of 4.3, indicating a moderate severity level.

How To Fix

Minimum fixed version

2.2.8

This is the first release that contains the fix.

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Workaround

There is no specific workaround provided for this vulnerability. The recommended solution is to upgrade to requests-plugin version 2.2.8 or later.

Conclusion

The requests-plugin in Jenkins is vulnerable to a permission check bypass, allowing unauthorized users to send test emails. To mitigate this vulnerability, it is crucial to upgrade to requests-plugin version 2.2.8 or later. This version includes a permission check that restricts the ability to send test emails to users with Overall/Administer permission. For further assistance and support in vulnerability remediation, please contact DevNack.com.

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