What is CVE-2023-46735?

CVE-2023-46735 is a medium-severity cross-site scripting (XSS) vulnerability in symfony/webhook (composer), affecting versions >= 6.3.0, < 6.3.8. It is fixed in 6.3.8. Untrusted input is rendered as active markup in a victim's browser, which can run script in their session.

How severe is CVE-2023-46735?

CVE-2023-46735 has a CVSS score of 6.1 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.

Which packages are affected by CVE-2023-46735?

symfony/webhook (composer) versions >= 6.3.0, = 6.3.0, < 6.3.8.

Is there a fix for CVE-2023-46735?

Yes. CVE-2023-46735 is fixed in 6.3.8. Upgrade to this version or later.

Is CVE-2023-46735 exploitable, and should I be worried?

Whether CVE-2023-46735 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-2023-46735 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-2023-46735 in symfony/webhook

Q: How severe is CVE-2023-46735?

CVE-2023-46735 has a CVSS score of 6.1 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.

Q: Which packages are affected by CVE-2023-46735?

symfony/webhook (composer) versions >= 6.3.0, = 6.3.0, < 6.3.8.

Q: Is there a fix for CVE-2023-46735?

Yes. CVE-2023-46735 is fixed in 6.3.8. Upgrade to this version or later.

Q: Is CVE-2023-46735 exploitable, and should I be worried?

Whether CVE-2023-46735 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-2023-46735 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-2023-46735?

Upgrade: symfony/webhook to 6.3.8 or later, symfony/symfony to 6.3.8 or later.

Summary

Symfony potential Cross-site Scripting in WebhookController

Description

The error message in WebhookController returns unescaped user-submitted input.

Resolution

WebhookController now doesn't return any user-submitted input in its response.

The patch for this issue is available here for branch 6.3.

Credits

We would like to thank Maxime Aknin for reporting the issue and to Nicolas Grekas for providing the fix.

Impact

Untrusted input is rendered as active markup in a victim's browser, which can run script in their session. Typical impact: session or credential theft, and actions taken as the user.

CVE-2023-46735 has a CVSS score of 6.1 (Medium). The vector is network-reachable, no privileges required, and user interaction required. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (6.3.8); upgrading removes the vulnerable code path.

Affected versions

symfony/webhook (>= 6.3.0, < 6.3.8) symfony/symfony (>= 6.3.0, < 6.3.8)

Security releases

symfony/webhook → 6.3.8 (composer) symfony/symfony → 6.3.8 (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 the following packages to resolve this vulnerability:

symfony/webhook to 6.3.8 or later; symfony/symfony to 6.3.8 or later

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

Frequently Asked Questions

What is CVE-2023-46735? CVE-2023-46735 is a medium-severity cross-site scripting (XSS) vulnerability in symfony/webhook (composer), affecting versions >= 6.3.0, < 6.3.8. It is fixed in 6.3.8. Untrusted input is rendered as active markup in a victim's browser, which can run script in their session.
How severe is CVE-2023-46735? CVE-2023-46735 has a CVSS score of 6.1 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
Which packages are affected by CVE-2023-46735?
- symfony/webhook (composer) (versions >= 6.3.0, < 6.3.8)
- symfony/symfony (composer) (versions >= 6.3.0, < 6.3.8)
Is there a fix for CVE-2023-46735? Yes. CVE-2023-46735 is fixed in 6.3.8. Upgrade to this version or later.
Is CVE-2023-46735 exploitable, and should I be worried? Whether CVE-2023-46735 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-2023-46735 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-2023-46735?
- Upgrade symfony/webhook to 6.3.8 or later
- Upgrade symfony/symfony to 6.3.8 or later