CVE-2026-4828Network attack vector

Authenticated MFA bypass via crafted OAuth login

Published Apr 1, 2026 · Updated Apr 1, 2026

Improper authentication in Devolutions Server 2026.1.11 and earlier allows remote authenticated users to bypass MFA via OAuth login requests. Devolutions has not disclosed which OAuth login parameter or validation step fails to enforce the configured secondary factor. Valid credentials and OAuth authentication are required; the flaw defeats the secondary factor and permits access as the credentialed account.

CVSS severity7.7
High
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

Improper authentication in Devolutions Server 2026.1.11 and earlier allows remote authenticated users to bypass MFA via OAuth login requests. Devolutions has not disclosed which OAuth login parameter or validation step fails to enforce the configured secondary factor. Valid credentials and OAuth authentication are required; the flaw defeats the secondary factor and permits access as the credentialed account.

The record

CVE
CVE-2026-4828
Published
Apr 1, 2026
Updated
Apr 1, 2026
Vendor
Ironman Software
Product
Devolutions Server
Classifications
CWE-1390, T1078
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 1, 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 <=2026.1.11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Ironman Software · Devolutions Serverversion=0 <=2026.1.11

Published CVSS scores

7.7DevolutionsCVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
8.2CISA-ADPCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1390Weak Authentication
T1078Valid Accounts

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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