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CVE-2026-110838— FreeRDP shadow before 3.32.0 Pre-Authentication Input Injection via Confirm Active bypass

Quick assessment

Affected
FreeRDP FreeRDP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FreeRDP 影子服务器在 3.0.0 至 3.32.0 版本（不含 3.32.0）中存在漏洞，该漏洞允许在 Confirm Active 状态期间、身份验证完成之前调度输入协议数据单元（PDU）。这使得未经身份验证的攻击者能够注入键盘输入。攻击者可以协商仅使用 TLS 的 RDP 连接，并在未收到 Confirm Active 确认的情况下发送输入 PDU，从而通过 XTEST 协议将合成的按键事件注入到主机用户的 X11 会话中。

CVSS 7.5 · High EPSS 0.26% · P17

Affected Version Matrix 2

VendorProduct Version RangeStatus
FreeRDP FreeRDP 3.0.0< 3.32.0 affected
3.32.0 unaffected
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I. Basic Information for CVE-2026-110838

Vulnerability Information
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Vulnerability Title
FreeRDP shadow before 3.32.0 Pre-Authentication Input Injection via Confirm Active bypass
Source: CVE Program / CVE List V5
Vulnerability Description
FreeRDP shadow server from 3.0.0 before 3.32.0 dispatches input PDUs during the Confirm Active state before authentication, allowing unauthenticated attackers to inject keyboard input. Attackers can negotiate TLS-only RDP and send an input PDU without Confirm Active to inject synthetic keystrokes into the host user's X11 session via XTEST.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
FreeRDP FreeRDP 3.0.0 ~ 3.32.0 -

II. Public POCs for CVE-2026-110838

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III. Intelligence Information for CVE-2026-110838

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Other References for CVE-2026-110838 (2)

Same Patch Batch · FreeRDP · 2026-10-14 · 11 CVEs total

CVE-2026-110839 7.1 HIGH FreeRDP 3.3.0 before 3.32.0 Heap Out-of-Bounds Write via Grayscale JPEG Clipboard Data
CVE-2026-110837 7.1 HIGH FreeRDP 2.0.0 before 3.32.0 Heap Buffer Overflow via MP3 Audio Decoding
CVE-2026-110829 6.5 MEDIUM FreeRDP 3.0.0 before 3.32.0 Null Pointer Dereference via rdpsnd Fragment
CVE-2026-110836 6.5 MEDIUM FreeRDP 3.0.0 before 3.32.0 Infinite Loop DoS via Gateway Content-Type
CVE-2026-110834 6.5 MEDIUM FreeRDP 2.0.0 before 3.32.0 Denial of Service via Serial IRP Null Handle
CVE-2026-110832 6.5 MEDIUM FreeRDP 2.0.0 before 3.32.0 Memory Exhaustion via DRDYNVC DATA_FIRST
CVE-2026-110830 5.9 MEDIUM FreeRDP before 3.32.0 Denial of Service via Serial IRP_MJ_CREATE
CVE-2026-110833 5.9 MEDIUM FreeRDP before 3.32.0 Unbounded Memory Retention via RDPDR Proxy
CVE-2026-110831 4.3 MEDIUM FreeRDP 3.13.0 before 3.32.0 Resource Leak via Drive Redirection IRP_MJ_CREATE
CVE-2026-110835 4.0 MEDIUM FreeRDP 3.0.0 before 3.32.0 HTTP Header Injection via Proxy Routing Token

IV. Related Vulnerabilities

Same product: FreeRDP
Same vendor: FreeRDP
Same weakness: CWE-306

V. Comments for CVE-2026-110838

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