# CVE-2026-72746: freerdp3: FreeRDP before 3.30.0 contains a server-side authentication bypass in the RDSTLS handshake

CVE-2026-72746 is fixed in 12 products on 1 platform, first by DEBIAN-CVE-2026-72746, released August 13, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-72746
- Priority: High
- CVSS: n/a (important)
- EPSS: n/a
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 11, 2026

## Description

FreeRDP before 3.30.0 contains a server-side authentication bypass in the RDSTLS handshake. When a server is configured with RdstlsSecurity = TRUE, the handshake dispatches inbound PDUs based solely on the attacker-supplied wire pduType without verifying that the received PDU is the one required at the current step. Because the rdpRdstls object is calloc-zeroed, its resultCode defaults to 0 (RDSTLS_RESULT_SUCCESS). An unauthenticated remote client can send a Capabilities PDU instead of the required Authentication Request PDU; rdstls_process_capabilities() returns success without ever setting resultCode, so the server responds with an AUTHRSP carrying resultCode SUCCESS and treats the session as authenticated without evaluating any password, redirection GUID, or auto-reconnect cookie. This affects the released FreeRDP 3.x series (e.g., 3.27.1) and master HEAD; at the time of the advisory no patched version was available.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | freerdp amzn 2023 | 2:3.6.3-1.amzn2023.0.15 | [ALAS2023-2026-2111](https://patchblox.com/security/data/fix/linux/alas2023-2026-2111.md) | Aug 31, 2026 |
| Linux | freerdp-debuginfo amzn 2023 | 2:3.6.3-1.amzn2023.0.15 | [ALAS2023-2026-2111](https://patchblox.com/security/data/fix/linux/alas2023-2026-2111.md) | Aug 31, 2026 |
| Linux | freerdp-debugsource amzn 2023 | 2:3.6.3-1.amzn2023.0.15 | [ALAS2023-2026-2111](https://patchblox.com/security/data/fix/linux/alas2023-2026-2111.md) | Aug 31, 2026 |
| Linux | freerdp-devel amzn 2023 | 2:3.6.3-1.amzn2023.0.15 | [ALAS2023-2026-2111](https://patchblox.com/security/data/fix/linux/alas2023-2026-2111.md) | Aug 31, 2026 |
| Linux | freerdp-libs amzn 2023 | 2:3.6.3-1.amzn2023.0.15 | [ALAS2023-2026-2111](https://patchblox.com/security/data/fix/linux/alas2023-2026-2111.md) | Aug 31, 2026 |
| Linux | freerdp-libs-debuginfo amzn 2023 | 2:3.6.3-1.amzn2023.0.15 | [ALAS2023-2026-2111](https://patchblox.com/security/data/fix/linux/alas2023-2026-2111.md) | Aug 31, 2026 |
| Linux | freerdp-server amzn 2023 | 2:3.6.3-1.amzn2023.0.15 | [ALAS2023-2026-2111](https://patchblox.com/security/data/fix/linux/alas2023-2026-2111.md) | Aug 31, 2026 |
| Linux | freerdp-server-debuginfo amzn 2023 | 2:3.6.3-1.amzn2023.0.15 | [ALAS2023-2026-2111](https://patchblox.com/security/data/fix/linux/alas2023-2026-2111.md) | Aug 31, 2026 |
| Linux | freerdp3 Debian 14 | 3.30.0+dfsg-1 | [DEBIAN-CVE-2026-72746](https://patchblox.com/security/data/fix/linux/debian-cve-2026-72746.md) | Aug 13, 2026 |
| Linux | libwinpr amzn 2023 | 2:3.6.3-1.amzn2023.0.15 | [ALAS2023-2026-2111](https://patchblox.com/security/data/fix/linux/alas2023-2026-2111.md) | Aug 31, 2026 |
| Linux | libwinpr-debuginfo amzn 2023 | 2:3.6.3-1.amzn2023.0.15 | [ALAS2023-2026-2111](https://patchblox.com/security/data/fix/linux/alas2023-2026-2111.md) | Aug 31, 2026 |
| Linux | libwinpr-devel amzn 2023 | 2:3.6.3-1.amzn2023.0.15 | [ALAS2023-2026-2111](https://patchblox.com/security/data/fix/linux/alas2023-2026-2111.md) | Aug 31, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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