How severe is CVE-2026-30964?

CVE-2026-30964 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-30964 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-30964?

CVE-2026-30964 primarily affects Spomky-labs Webauthn-lib. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-30964?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-30964 have an EU (EUVD) identifier?

Yes. CVE-2026-30964 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10705.

When was CVE-2026-30964 published?

CVE-2026-30964 was published on 2026-03-10 and last updated on 2026-06-17.

CVE-2026-30964

CVE-2026-30964 is a medium-severity vulnerability in Spomky-labs Webauthn-lib with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-346.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 0% (10th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-10705
Weakness: CWE-346
Affected product: Spomky-labs Webauthn-lib
Published: 2026-03-10
Last modified: 2026-06-17

Description

web-auth/webauthn-lib is an open source set of PHP libraries and a Symfony bundle to allow developers to integrate that authentication mechanism into their web applications. Prior to 5.2.4, when allowed_origins is configured, CheckAllowedOrigins reduces URL-like values to their host component and accepts on host match alone. This makes exact origin policies impossible to express: scheme and port differences are silently ignored. This vulnerability is fixed in 5.2.4.

Frequently asked questions

What is CVE-2026-30964?: web-auth/webauthn-lib is an open source set of PHP libraries and a Symfony bundle to allow developers to integrate that authentication mechanism into their web applications. Prior to 5.2.4, when allowed_origins is configured, CheckAllowedOrigins reduces URL-like values to their host component and accepts on host match alone. This makes exact origin policies impossible to express: scheme and port differences are silently ignored. This vulnerability is fixed in 5.2.4.
How severe is CVE-2026-30964?: CVE-2026-30964 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-30964 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-30964?: CVE-2026-30964 primarily affects Spomky-labs Webauthn-lib. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-30964?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-30964 have an EU (EUVD) identifier?: Yes. CVE-2026-30964 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10705.
When was CVE-2026-30964 published?: CVE-2026-30964 was published on 2026-03-10 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:spomky-labs:webauthn-lib:*:*:*:*:*:*:*:*
cpe:2.3:a:spomky-labs:webauthn-symfony-bundle:*:*:*:*:*:*:*:*
cpe:2.3:a:spomky-labs:webauthn_framwork:*:*:*:*:*:*:*:*

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