CVE-2026-73241Public exploitNetwork attack vector

Unauthenticated session access via out-of-sequence Capabilities PDU

Published Aug 11, 2026 · Updated Aug 11, 2026

Authentication bypass in FreeRDP before 3.30.0 allows remote attackers to obtain an authenticated RDSTLS server session without credentials. The server accepts a Capabilities PDU while awaiting an Authentication Request, skips credential comparison, and retains a zero-initialized SUCCESS result. Exploitation requires the non-default RdstlsSecurity setting and advances the connection to MCS as authenticated without checking a password, username, domain, or redirection GUID.

CVSS severity8.3
High
EPSS probability0.38%
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 FreeRDP before 3.30.0 allows remote attackers to obtain an authenticated RDSTLS server session without credentials. The server accepts a Capabilities PDU while awaiting an Authentication Request, skips credential comparison, and retains a zero-initialized SUCCESS result. Exploitation requires the non-default RdstlsSecurity setting and advances the connection to MCS as authenticated without checking a password, username, domain, or redirection GUID.

The record

CVE
CVE-2026-73241
Published
Aug 11, 2026
Updated
Aug 11, 2026
Vendor
FreeRDP
Product
FreeRDP
Classifications
CWE-287, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 11, 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=< 3.30.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FreeRDP · FreeRDPversion=< 3.30.0

Published CVSS scores

8.3GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA: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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-287Improper Authentication
T1190Exploit Public-Facing Application

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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