CVE-2026-30964 | Webauthn Framework: allowed_origins collapses URL-like origins to host-only values, bypassing exact origin validation

Exp

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.

Published: 2026-03-10 Last update: 2026-05-07 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-30964 is rated Exploit Available (50/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.02%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2026-30964

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2026-30964

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-03-11 — 0.02% —

Full EPSS history (1 record total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-30964

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.4 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 2.5 [email protected]

Weakness enumeration for CVE-2026-30964

GitHub Security Advisory for CVE-2026-30964

GHSA-f7pm-6hr8-7ggm · Severity: medium · Ecosystem: composer — Webauthn Framework: allowed_origins collapses URL-like origins to host-only values, bypassing exact origin validation

Affected software / configurations for CVE-2026-30964

Vendor Product Version Raw CPE
spomky-labs webauthn-lib >= 5.2.0, < 5.2.4 cpe:2.3:a:spomky-labs:webauthn-lib:*:*:*:*:*:*:*:*
spomky-labs webauthn-symfony-bundle >= 5.2.0, < 5.2.4 cpe:2.3:a:spomky-labs:webauthn-symfony-bundle:*:*:*:*:*:*:*:*
spomky-labs webauthn_framwork >= 5.2.0, < 5.2.4 cpe:2.3:a:spomky-labs:webauthn_framwork:*:*:*:*:*:*:*:*

References for CVE-2026-30964

cvelogic Threat Intelligence