CVE-2026-30964: web-auth/webauthn-lib is an open source set of PHP libraries and a Symfony bundle to allow developers to integ

Routine

MEDIUM 5.4UPGRADEUPGRADEUPGRADE

CVE-2026-30964 is a medium-severity flaw (CVSS 5.4) affecting webauthn-lib, webauthn-symfony-bundle, webauthn framwork. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 vulnerabilit

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 89%)
CISA exploited list	No
Weakness	CWE-346
Published	2026-03-10
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: spomky-labs

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-10 18:18 UTCPublished CVE record published
2026-06-17 10:33 UTCUpdated Record last modified

spomky-labs webauthn-lib UPGRADE

Affected: >= 5.2.0 and < 5.2.4

Fixed in: 5.2.4

Safe to downgrade to: a release before 5.2.0

1. Check installed version

apt-cache policy webauthn-lib || rpm -q webauthn-lib || webauthn-lib --version

2. UPGRADE to 5.2.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade webauthn-lib

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade webauthn-lib

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 5.2.0 (Debian / Ubuntu)

apt-cache madison webauthn-lib sudo apt install webauthn-lib=<VERSION_BEFORE_5.2.0> sudo apt-mark hold webauthn-lib

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list webauthn-lib sudo dnf downgrade webauthn-lib-<VERSION_BEFORE_5.2.0> sudo dnf versionlock add webauthn-lib

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

spomky-labs webauthn-symfony-bundle UPGRADE

Affected: >= 5.2.0 and < 5.2.4

Fixed in: 5.2.4

Safe to downgrade to: a release before 5.2.0

1. Check installed version

apt-cache policy webauthn-symfony-bundle || rpm -q webauthn-symfony-bundle || webauthn-symfony-bundle --version

2. UPGRADE to 5.2.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade webauthn-symfony-bundle

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade webauthn-symfony-bundle

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 5.2.0 (Debian / Ubuntu)

apt-cache madison webauthn-symfony-bundle sudo apt install webauthn-symfony-bundle=<VERSION_BEFORE_5.2.0> sudo apt-mark hold webauthn-symfony-bundle

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list webauthn-symfony-bundle sudo dnf downgrade webauthn-symfony-bundle-<VERSION_BEFORE_5.2.0> sudo dnf versionlock add webauthn-symfony-bundle

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

spomky-labs webauthn framwork UPGRADE

Affected: >= 5.2.0 and < 5.2.4

Fixed in: 5.2.4

Safe to downgrade to: a release before 5.2.0

1. Check installed version

apt-cache policy webauthn-framwork || rpm -q webauthn-framwork || webauthn-framwork --version

2. UPGRADE to 5.2.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade webauthn-framwork

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade webauthn-framwork

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 5.2.0 (Debian / Ubuntu)

apt-cache madison webauthn-framwork sudo apt install webauthn-framwork=<VERSION_BEFORE_5.2.0> sudo apt-mark hold webauthn-framwork

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list webauthn-framwork sudo dnf downgrade webauthn-framwork-<VERSION_BEFORE_5.2.0> sudo dnf versionlock add webauthn-framwork

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-30964?

webauthn-lib: upgrade to 5.2.4; webauthn-symfony-bundle: upgrade to 5.2.4; webauthn framwork: upgrade to 5.2.4. Exact commands for each OS are on this page.

Is CVE-2026-30964 being exploited?

CVE-2026-30964 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-30964 affect?

CVE-2026-30964 affects webauthn-lib, webauthn-symfony-bundle, webauthn framwork. Severity is medium (CVSS 5.4). 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, CheckAllowedOr

How urgent is CVE-2026-30964?

Priority 27/100. Public exploit reference

Software pages

PHP vulnerabilities

References

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