CVE-2026-5794Network attack vector

Authenticated account lockout via crafted server request

Published Apr 28, 2026 · Updated Apr 28, 2026

Account-lockout abuse in Ercom Cryptobox server before 4.38.0 and 4.40.175 allows authenticated users to prevent other users from logging in. Ercom identifies a specially crafted request and duplicate-identifier handling but does not disclose the affected endpoint or the operation that associates the request with another account. Low-privileged network access is required, and the reported consequence is limited to the targeted account's availability.

CVSS severityUnavailable
Unscored
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Account-lockout abuse in Ercom Cryptobox server before 4.38.0 and 4.40.175 allows authenticated users to prevent other users from logging in. Ercom identifies a specially crafted request and duplicate-identifier handling but does not disclose the affected endpoint or the operation that associates the request with another account. Low-privileged network access is required, and the reported consequence is limited to the targeted account's availability.

The record

CVE
CVE-2026-5794
Published
Apr 28, 2026
Updated
Apr 28, 2026
Vendor
Ercom
Product
Cryptobox
Classifications
CWE-694, CAPEC-2, T1531
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 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=4.37.237 <4.38.0
  2. Affected versionversion=4.40.175

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Ercom · Cryptoboxversion=4.37.237 <4.38.0; version=4.40.175

Published CVSS scores

4.9Thales GroupCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-694Use of Multiple Resources with Duplicate Identifier
CAPEC-2Inducing Account Lockout
T1531Account Access Removal

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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