Is CVE-2026-30964 in the CISA KEV catalog?

No. CVE-2026-30964 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-30964?

CVE-2026-30964 has a CVSS v3 base score of 5.4 (MEDIUM).

What is the EPSS score for CVE-2026-30964?

CVE-2026-30964 has an EPSS score of 0.20% (10th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-30964?

Upgrade webauthn-lib to 5.2.4 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2026-30964

MEDIUM

5.4

CVSS v3

NVD

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.

CWE-346

How to fix

Remediation Available

webauthn-libNVD

Affected:>= 5.2.0, < 5.2.4Fixed in:5.2.4CVE-2026-30964derived from NVD

webauthn-symfony-bundleNVD

Affected:>= 5.2.0, < 5.2.4Fixed in:5.2.4CVE-2026-30964derived from NVD

webauthn framworkNVD

Affected:>= 5.2.0, < 5.2.4Fixed in:5.2.4CVE-2026-30964derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Exploit Intelligence

0.20%probability of exploitation in 30 days

10thpercentile

Low risk: more likely to be exploited than 10% of all known CVEs.

References

Patch2

Exploit1

github.com

Related Vulnerabilities

Other CWE-346 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2009-1185	High	7.2	82%	-	Fix
CVE-2025-34291	High	8.8	79%	KEV	-
CVE-2020-16952	High	8.6	71%	-	-
CVE-2023-29711	Critical	9.8	70%	-	-
CVE-2015-4495	High	8.8	70%	KEV	Fix
CVE-2024-23898	High	8.8	67%	-	Fix

Embed a live status badge for CVE-2026-30964

Markdown

[![CVE-2026-30964](https://tridentstack.com/cve/badge/CVE-2026-30964.svg)](https://tridentstack.com/cve/CVE-2026-30964)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-30964"><img src="https://tridentstack.com/cve/badge/CVE-2026-30964.svg" alt="CVE-2026-30964"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-07.