CVE-2025-56224Network attack vector

Mobile-number verification bypass via unrestricted OTP guessing

Published Oct 20, 2025 · Updated Oct 20, 2025

Authentication bypass in Ascertia SigningHub 8.6.8 allows remote authenticated users to verify another user's mobile number. The mobile-number OTP verification endpoint accepts unrestricted guesses because it neither rate-limits attempts nor revokes the code after repeated failures. An authenticated account and a target mobile number are required; a correct brute-forced OTP permits impersonation of that number during verification.

CVSS severity8.1
High
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Ascertia SigningHub 8.6.8 allows remote authenticated users to verify another user's mobile number. The mobile-number OTP verification endpoint accepts unrestricted guesses because it neither rate-limits attempts nor revokes the code after repeated failures. An authenticated account and a target mobile number are required; a correct brute-forced OTP permits impersonation of that number during verification.

The record

CVE
CVE-2025-56224
Published
Oct 20, 2025
Updated
Oct 20, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-307, T1110
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 20, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 20, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.1CISA-ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-307Improper Restriction of Excessive Authentication Attempts
T1110Brute Force

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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