What is CVE-2021-30492?

CVE-2021-30492 is a critical-severity improper input validation vulnerability in zendesk/zendesk_api_client_php (composer), affecting versions < 2.2.11. It is fixed in 2.2.11. The application does not adequately validate input before processing it, allowing unexpected values to reach sensitive code paths.

Which versions of zendesk/zendesk_api_client_php are affected by CVE-2021-30492?

zendesk/zendesk_api_client_php (composer) versions < 2.2.11 is affected.

Is there a fix for CVE-2021-30492?

Yes. CVE-2021-30492 is fixed in 2.2.11. Upgrade to this version or later.

Is CVE-2021-30492 exploitable, and should I be worried?

Whether CVE-2021-30492 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk.

What actually determines whether CVE-2021-30492 is exploitable, and how bad it is?

Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.

CVE-2021-30492 in zendesk/zendesk_api_client_php

Q: Which versions of zendesk/zendesk_api_client_php are affected by CVE-2021-30492?

zendesk/zendesk_api_client_php (composer) versions < 2.2.11 is affected.

Q: Is there a fix for CVE-2021-30492?

Yes. CVE-2021-30492 is fixed in 2.2.11. Upgrade to this version or later.

Q: Is CVE-2021-30492 exploitable, and should I be worried?

Whether CVE-2021-30492 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk.

Q: What actually determines whether CVE-2021-30492 is exploitable, and how bad it is?

Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.

Q: How do I fix CVE-2021-30492?

Upgrade zendesk/zendesk_api_client_php to 2.2.11 or later.

Summary

Lack of Input Validation in zendeskapiclient_php for Zendesk Subdomain

Resolution

Validate the provided Zendesk subdomain to be a valid subdomain in:

getAuthUrl
getAccessToken

Impact

Lack of input validation of the Zendesk subdomain could expose users of the library to Server Side Request Forgery (SSRF).

The application does not adequately validate input before processing it, allowing unexpected values to reach sensitive code paths. Typical impact: varies by context: data corruption, logic bypass, or denial of service.

Affected versions

zendesk/zendesk_api_client_php (< 2.2.11)

Security releases

zendesk/zendesk_api_client_php → 2.2.11 (composer)

Kodem intelligence

Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.

Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.

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Remediation advice

Upgrade zendesk/zendesk_api_client_php to 2.2.11 or later to resolve this vulnerability.

Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.

Frequently Asked Questions

What is CVE-2021-30492? CVE-2021-30492 is a critical-severity improper input validation vulnerability in zendesk/zendesk_api_client_php (composer), affecting versions < 2.2.11. It is fixed in 2.2.11. The application does not adequately validate input before processing it, allowing unexpected values to reach sensitive code paths.
Which versions of zendesk/zendesk_api_client_php are affected by CVE-2021-30492? zendesk/zendesk_api_client_php (composer) versions < 2.2.11 is affected.
Is there a fix for CVE-2021-30492? Yes. CVE-2021-30492 is fixed in 2.2.11. Upgrade to this version or later.
Is CVE-2021-30492 exploitable, and should I be worried? Whether CVE-2021-30492 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
What actually determines whether CVE-2021-30492 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
How do I fix CVE-2021-30492? Upgrade zendesk/zendesk_api_client_php to 2.2.11 or later.