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CVE-2026-55626— xrdp: No authentication required with Xvnc backend on RHEL 9

Quick assessment

Affected
neutrinolabs xrdp
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

neutrinolabs xrdp是neutrinolabs团队开源的一款开源远程桌面协议服务器。 neutrinolabs xrdp 0.10.6及之前版本存在授权问题漏洞，该漏洞源于Xvnc后端通过UNIX域套接字初始化认证会话时认证机制不足，可能导致本地认证的攻击者绕过会话隔离，未授权查看或控制同一系统上其他用户的桌面会话。

CVSS 8.0 · High EPSS 0.19% · P7

Affected Version Matrix 1

VendorProduct Version RangeStatus
neutrinolabs xrdp < 0.10.6.1 affected
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I. Basic Information for CVE-2026-55626

Vulnerability Information
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Vulnerability Title
xrdp: No authentication required with Xvnc backend on RHEL 9
Source: CVE Program / CVE List V5
Vulnerability Description
xrdp is an open source RDP server. In versions 0.10.6 and prior, when an authenticated user session is initialized using the Xvnc backend over UNIX domain sockets, the Xvnc process is launched with insufficient authentication mechanisms. A local authenticated attacker could exploit this vulnerability to bypass intended session isolation, allowing them to unauthorizedly view or control the active desktop sessions of other users on the same system. Users using other backends, such as xorgxrdp or Xvnc over TCP sockets, are not affected. This issue has been fixed in version 0.10.6.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
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
Vulnerability Title
neutrinolabs xrdp 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
neutrinolabs xrdp是neutrinolabs团队开源的一款开源远程桌面协议服务器。 neutrinolabs xrdp 0.10.6及之前版本存在授权问题漏洞，该漏洞源于Xvnc后端通过UNIX域套接字初始化认证会话时认证机制不足，可能导致本地认证的攻击者绕过会话隔离，未授权查看或控制同一系统上其他用户的桌面会话。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
neutrinolabs xrdp < 0.10.6.1 -

II. Public POCs for CVE-2026-55626

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 10955 chars
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In-depth vulnerability mechanism
Trigger conditions & impact
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-55626

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Vendor Advisories for CVE-2026-55626 (1)

Vendor Pages for CVE-2026-55626 (1)

Same Patch Batch · neutrinolabs · 2026-07-20 · 10 CVEs total

CVE-2026-41252 9.8 CRITICAL xrdp: lib_palette_update Heap Buffer Overflow & RCE
CVE-2026-44178 8.8 HIGH xrdp: Channel Data Forwarding Fixed-Size Buffer Overflow
CVE-2026-41521 8.2 HIGH xrdp: lib_framebuffer_update Has Integer Overflow Heap Info Leak & ASLR Bypass
CVE-2026-54538 7.5 HIGH xrdp: Pre-auth infinite loop via totalLength=0 in TS_SHARECONTROLHEADER
CVE-2026-55645 6.5 MEDIUM xrdp: Out-of-bounds read in Client Control PDU processing (xrdp_rdp_process_data_control)
CVE-2026-42218 5.3 MEDIUM XRDP is vulnerable to a server timing attack, leading to user enumeration
CVE-2026-44978 5.3 MEDIUM xrdp: Unchecked FIPS padding length in standard RDP Security causes heap out-of-bounds rea
CVE-2026-55238 5.3 MEDIUM xrdp: Malformed Confirm Active capability sets cause out-of-bounds reads
CVE-2026-55639 5.3 MEDIUM xrdp: Out-of-bounds read in GCC Conference Create Request CS_SECURITY processing (xrdp_sec

IV. Related Vulnerabilities

Same product: xrdp
Same vendor: neutrinolabs
Same weakness: CWE-306

V. Comments for CVE-2026-55626

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