CVE-2026-18356Public exploitNetwork attack vector

Blocked-account login via incomplete denylist matching

Published Aug 21, 2026 · Updated Aug 21, 2026

Authentication bypass in Limit Login Attempts Security before 3.3.5 allows remote authenticated users to access denylisted accounts. The local username denylist compares submitted usernames case-sensitively and omits the account email from matching, so equivalent login identifiers evade the block. Exploitation requires valid credentials for an account on the non-default denylist and grants only that account's existing access.

CVSS severity3.7
Low
EPSS probability0.20%
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 Limit Login Attempts Security before 3.3.5 allows remote authenticated users to access denylisted accounts. The local username denylist compares submitted usernames case-sensitively and omits the account email from matching, so equivalent login identifiers evade the block. Exploitation requires valid credentials for an account on the non-default denylist and grants only that account's existing access.

The record

CVE
CVE-2026-18356
Published
Aug 21, 2026
Updated
Aug 21, 2026
Vendor
WPChef
Product
Limit Login Attempts Security
Classifications
CWE-184, T1078
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 21, 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=0 <3.3.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

WPChef · Limit Login Attempts Securityversion=0 <3.3.5

Published CVSS scores

3.7INCIBE-CERTCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-184Incomplete List of Disallowed Inputs
T1078Valid Accounts

Public exploit references

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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