Is This vulnerability exploited in the wild?

No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.

How severe is This vulnerability?

Medium severity, with a CVSS score of 6.6, published 26 June 2026.

Which products and versions are affected?

web-auth/webauthn-symfony-bundle (Packagist) < 5.3.4.

Is there a fix for This vulnerability?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is This vulnerability attacked?

It is attacked over the network, in a software library.

Check whether you run web-auth/webauthn-symfony-bundle (Packagist) or Web-Auth WebAuthn Symfony Bundle at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

web-auth webauthn-symfony-bundle sensitive information leak in logs

Q: Is there a fix for This vulnerability?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

Q: How is This vulnerability attacked?

It is attacked over the network, in a software library.

Q: Am I affected?

Check whether you run web-auth/webauthn-symfony-bundle (Packagist) or Web-Auth WebAuthn Symfony Bundle at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Severity: medium · CVSS 6.6 · Published 2026-06-26

A vulnerability in the WebAuthn Symfony bundle causes sensitive login information to be recorded in system logs. This includes session cookies and authorization headers, which could allow anyone with access to the logs to hijack user sessions or steal credentials. This is particularly risky for organizations that use centralized logging platforms where access may be broader than the application itself.

Vendors: Packagist.

Quick answers

Is This vulnerability exploited in the wild?: No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.
How severe is This vulnerability?: Medium severity, with a CVSS score of 6.6, published 26 June 2026.
Which products and versions are affected?: web-auth/webauthn-symfony-bundle (Packagist) < 5.3.4.
Is there a fix for This vulnerability?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is This vulnerability attacked?: It is attacked over the network, in a software library.
Am I affected?: Check whether you run web-auth/webauthn-symfony-bundle (Packagist) or Web-Auth WebAuthn Symfony Bundle at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The WebauthnAuthenticator class in the web-auth/webauthn-symfony-bundle logs the entire Symfony Request object during authentication success and failure events at the INFO level. Because the Request object's string representation includes all raw HTTP headers, sensitive data such as 'Cookie' and 'Authorization' headers are written to the log stream in clear text. This occurs when loggers normalize or stringify the context, which is the default behavior for common formatters like LineFormatter and JsonFormatter. Attackers with access to log files or centralized logging platforms (e.g., ELK, Splunk) can use these leaked headers to perform session hijacking. The issue is fixed in version 5.3.4 by logging only non-sensitive request metadata.

Affected products

web-auth webauthn-symfony-bundle < 5.3.4

Timeline

2026-05-24: disclosed
2026-05-24: advisory: Initial advisory published
2026-06-26: other: Advisory updated and reviewed

References

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