CVE-2026-48505Network attack vectorHinoki check available

MFA recovery-code reuse via concurrent validation

Published Jun 22, 2026 · Updated Jun 22, 2026

Race condition in Filament 4.0.0 through 4.11.4 and 5.0.0 through 5.6.4 allows remote attackers to reuse app MFA recovery codes. The app-based MFA recovery-code path validates and consumes a code non-atomically, so parallel requests can authenticate before the code is burned. Recovery codes must be enabled, and possession of the user password plus a recovery code yields multiple authenticated sessions from one nominally single-use code; email-based MFA is unaffected.

CVSS severity7.4
High
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Race condition in Filament 4.0.0 through 4.11.4 and 5.0.0 through 5.6.4 allows remote attackers to reuse app MFA recovery codes. The app-based MFA recovery-code path validates and consumes a code non-atomically, so parallel requests can authenticate before the code is burned. Recovery codes must be enabled, and possession of the user password plus a recovery code yields multiple authenticated sessions from one nominally single-use code; email-based MFA is unaffected.

The record

CVE
CVE-2026-48505
Published
Jun 22, 2026
Updated
Jun 22, 2026
Vendor
Filament
Product
Filament
Classifications
CWE-841, CWE-362, T1078
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 4.0.0, < 4.11.5
  2. Affected versionversion=>= 5.0.0, < 5.6.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Filament · Filamentversion=>= 4.0.0, < 4.11.5; version=>= 5.0.0, < 5.6.5

Published CVSS scores

7.4GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-841Improper Enforcement of Behavioral Workflow
CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1078Valid Accounts

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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