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CVE-2025-59050— Greenshot — Insecure .NET deserialization via WM_COPYDATA enables local code execution

Quick assessment

Affected
greenshot greenshot
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.

GreenShot是GreenShot公司的一款适用于 Windows 的轻量级屏幕截图软件工具。 GreenShot 1.3.300及之前版本存在安全漏洞，该漏洞源于反序列化WM_COPYDATA消息中的攻击者控制数据时未经验证或身份验证，可能导致本地进程在相同完整性级别下触发任意代码执行。

CVSS 8.4 · High EPSS 0.29% · P21
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I. Basic Information for CVE-2025-59050

Vulnerability Information
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Vulnerability Title
Greenshot — Insecure .NET deserialization via WM_COPYDATA enables local code execution
Source: CVE Program / CVE List V5
Vulnerability Description
Greenshot is an open source Windows screenshot utility. Greenshot 1.3.300 and earlier deserializes attacker-controlled data received in a WM_COPYDATA message using BinaryFormatter.Deserialize without prior validation or authentication, allowing a local process at the same integrity level to trigger arbitrary code execution inside the Greenshot process. The vulnerable logic resides in a WinForms WndProc handler for WM_COPYDATA (message 74) that copies the supplied bytes into a MemoryStream and invokes BinaryFormatter.Deserialize, and only afterward checks whether the specified channel is authorized. Because the authorization check occurs after deserialization, any gadget chain embedded in the serialized payload executes regardless of channel membership. A local attacker who can send WM_COPYDATA to the Greenshot main window can achieve in-process code execution, which may aid evasion of application control policies by running payloads within the trusted, signed Greenshot.exe process. This issue is fixed in version 1.3.301. No known workarounds exist.
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:H
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5
Vulnerability Title
GreenShot 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GreenShot是GreenShot公司的一款适用于 Windows 的轻量级屏幕截图软件工具。 GreenShot 1.3.300及之前版本存在安全漏洞，该漏洞源于反序列化WM_COPYDATA消息中的攻击者控制数据时未经验证或身份验证，可能导致本地进程在相同完整性级别下触发任意代码执行。
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
greenshot greenshot < 1.3.301 -

II. Public POCs for CVE-2025-59050

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 10117 chars
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III. Intelligence Information for CVE-2025-59050

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Vendor Advisories for CVE-2025-59050 (1)

IV. Related Vulnerabilities

Same product: greenshot
Same vendor: greenshot
Same weakness: CWE-502

V. Comments for CVE-2025-59050

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