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CVE-2026-71981— Cypht < 2.12.2 PHP Object Injection RCE via back_query Parameter

Quick assessment

Affected
cypht-org cypht
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.

Cypht是Cypht组织开源的一款网页邮件聚合客户端。 Cypht 2.12.2之前版本存在反序列化注入漏洞，该漏洞源于PHP对象注入，攻击者可通过logout handler的back_query GET参数传递base64编码的序列化有效载荷，该参数被解码后直接传递给unserialize()，且未进行白名单、签名检查或类型限制，可能导致远程代码执行。

CVSS 8.8 · High EPSS 0.97% · P61

Affected Version Matrix 1

VendorProduct Version RangeStatus
cypht-org cypht < 2.12.2 affected
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I. Basic Information for CVE-2026-71981

Vulnerability Information
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Vulnerability Title
Cypht < 2.12.2 PHP Object Injection RCE via back_query Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
Cypht before 2.12.2 contains a PHP object injection vulnerability that allows authenticated attackers to execute arbitrary operating system commands by supplying a crafted PHP object graph in the back_query GET parameter of the logout handler. Attackers can pass a base64-encoded serialized payload through this parameter, which is decoded and passed directly to unserialize() without an allow-list, signature check, or type restriction, enabling gadget-chain exploitation to achieve remote code execution as the web server process.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/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
Cypht 反序列化注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cypht是Cypht组织开源的一款网页邮件聚合客户端。 Cypht 2.12.2之前版本存在反序列化注入漏洞，该漏洞源于PHP对象注入，攻击者可通过logout handler的back_query GET参数传递base64编码的序列化有效载荷，该参数被解码后直接传递给unserialize()，且未进行白名单、签名检查或类型限制，可能导致远程代码执行。
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
cypht-org cypht 0 ~ 2.12.2 -

II. Public POCs for CVE-2026-71981

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III. Intelligence Information for CVE-2026-71981

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Patches & Fixes for CVE-2026-71981 (2)

Vendor Advisories for CVE-2026-71981 (1)

Vendor Pages for CVE-2026-71981 (1)

IV. Related Vulnerabilities

Same product: cypht
Same vendor: cypht-org
Same weakness: CWE-502

V. Comments for CVE-2026-71981

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