CVE-2026-72746Public exploitNetwork attack vector

Unauthenticated session access via RDSTLS PDU confusion

Published Aug 11, 2026 · Updated Aug 11, 2026

Authentication bypass in FreeRDP before 3.30.0 allows remote attackers to enter RDSTLS server sessions without credentials. At the authentication step, rdstls_recv() accepts an attacker-selected Capabilities PDU instead of AUTHREQ while the zero-initialized resultCode remains RDSTLS_RESULT_SUCCESS. Reachability requires a server or proxy with non-default RdstlsSecurity enabled; the connection advances as authenticated to MCS without checking a password, redirection GUID, or auto-reconnect cookie.

CVSS severityUnavailable
Unscored
EPSS probabilityUnavailable
No score available in this record
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 enter RDSTLS server sessions without credentials. At the authentication step, rdstls_recv() accepts an attacker-selected Capabilities PDU instead of AUTHREQ while the zero-initialized resultCode remains RDSTLS_RESULT_SUCCESS. Reachability requires a server or proxy with non-default RdstlsSecurity enabled; the connection advances as authenticated to MCS without checking a password, redirection GUID, or auto-reconnect cookie.

The record

CVE
CVE-2026-72746
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=3.0.0 <3.30.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FreeRDP · FreeRDPversion=3.0.0 <3.30.0

Published CVSS scores

No CVSS assessment is available in this record.

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 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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