CVE-2024-39912

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 54% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.3Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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. The ProfileBasedRequestOptionsBuilder method returns allowedCredentials without any credentials if no username was found. When WebAuthn is used as the first or only authentication method, an attacker can enumerate usernames based on the absence of the allowedCredentials property in the assertion options response. This allows enumeration of valid or invalid usernames. By knowing which usernames are valid, attackers can focus their efforts on a smaller set of potential targets, increasing the efficiency and likelihood of successful attacks. This issue has been addressed in version 4.9.0 and all users are advised to upgrade. There are no known workarounds for this vulnerability.

CVSS v3
5.3
EG Score
5.3(medium)
EPSS
31.5%
KEV
Not listed

Published

July 15, 2024

Last Modified

April 15, 2026

References (4)

Affected Packages

(2 across 1 ecosystem)
Packagist(2)
PackageVulnerable rangeFixed inDependents
web-auth/webauthn-framework4.5.0 ... 4.8.7 (26 versions)4.9.0—
web-auth/webauthn-lib4.5.0 ... 4.8.7 (26 versions)4.9.0—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 11× in last 7d / 47× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 102 total refreshes for this CVE.

  1. 2026-07-12 05:45 UTCEPSS rescore
  2. 2026-07-11 08:26 UTCEPSS rescore
  3. 2026-07-11 08:26 UTCEPSS rescore
  4. 2026-07-11 03:41 UTCOSV refresh
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  1. 2026-06-24 14:04 UTCEPSS rescore
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  6. 2026-06-22 11:02 UTCOSV refresh
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  24. 2026-06-10 22:17 UTCEPSS rescore
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  26. 2026-06-08 14:16 UTCEPSS rescore
  27. 2026-06-07 15:24 UTCEPSS rescore
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  35. 2026-06-04 14:39 UTCOSV refresh
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  57. 2026-05-23 00:09 UTCEG score recompute
  58. 2026-05-22 21:16 UTCEPSS rescore
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  62. 2026-05-22 00:18 UTCEG score recompute
  63. 2026-05-21 22:42 UTCEPSS rescore
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  74. 2026-05-18 21:30 UTCEPSS rescore
  75. 2026-05-18 21:30 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2024-39912?
CVE-2024-39912 is a medium vulnerability published on July 15, 2024. 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. The ProfileBasedRequestOptionsBuilder method returns allowedCredentials without any credentials if no username was found.…
When was CVE-2024-39912 disclosed?
CVE-2024-39912 was first published in the National Vulnerability Database on July 15, 2024, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2024-39912 actively exploited?
CVE-2024-39912 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 31.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2024-39912?
CVE-2024-39912 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2024-39912?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-39912, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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