CVE-2026-16971Public exploitNetwork attack vector

MFA bypass via unlimited OTP validation attempts

Published Jul 30, 2026 · Updated Jul 30, 2026

Missing brute-force protection in DFIR-IRIS iris-web 2.4.26 allows remote attackers to bypass MFA by guessing a six-digit OTP. The POST /auth/mfa-verify endpoint accepts unlimited OTP attempts without delay or account lockout and distinguishes success with a redirect. Remote attackers who have passed the password step can exhaust the one-million-code space and gain the targeted user's application access.

CVSS severity5.9
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Missing brute-force protection in DFIR-IRIS iris-web 2.4.26 allows remote attackers to bypass MFA by guessing a six-digit OTP. The POST /auth/mfa-verify endpoint accepts unlimited OTP attempts without delay or account lockout and distinguishes success with a redirect. Remote attackers who have passed the password step can exhaust the one-million-code space and gain the targeted user's application access.

The record

CVE
CVE-2026-16971
Published
Jul 30, 2026
Updated
Jul 30, 2026
Vendor
DFIR-IRIS
Product
iris-web
Classifications
CWE-770, T1110.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 30, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=2.4.26

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

DFIR-IRIS · iris-webversion=2.4.26

Published CVSS scores

5.9SBA ResearchCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1110.001Password Guessing

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo