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CVE-2026-57527— ZAP ViewState Add-on Insecure Deserialization via JSFViewState.decode()

Quick assessment

Affected
zaproxy zap-extensions
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.

zaproxy zap-extensions是zaproxy的一个Web中间件扩展集合。 zaproxy zap-extensions 4之前版本存在反序列化漏洞，该漏洞源于不安全的反序列化，通过将恶意序列化Java对象嵌入javax.faces.ViewState HTTP响应参数，可能导致控制代理Web服务器的攻击者实现任意代码执行。

CVSS 8.8 · High EPSS 0.68% · P52

Affected Version Matrix 1

VendorProduct Version RangeStatus
zaproxy zap-extensions < 4 affected
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I. Basic Information for CVE-2026-57527

Vulnerability Information
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Vulnerability Title
ZAP ViewState Add-on Insecure Deserialization via JSFViewState.decode()
Source: CVE Program / CVE List V5
Vulnerability Description
Zed Attack Proxy (ZAP) ViewState add-on before version 4 contains an insecure deserialization vulnerability that allows attackers who control a proxied web server to achieve arbitrary code execution by embedding a malicious serialized Java object in the javax.faces.ViewState HTTP response parameter. The JSFViewState.decode() method base64-decodes the ViewState value and passes it directly to ObjectInputStream.readObject() without a deserialization filter, allowlist, or type restriction, causing the malicious object to be deserialized within the ZAP JVM when the Desktop UI renders the ViewState panel.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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
zaproxy zap-extensions 反序列化漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
zaproxy zap-extensions是zaproxy的一个Web中间件扩展集合。 zaproxy zap-extensions 4之前版本存在反序列化漏洞，该漏洞源于不安全的反序列化，通过将恶意序列化Java对象嵌入javax.faces.ViewState HTTP响应参数，可能导致控制代理Web服务器的攻击者实现任意代码执行。
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
zaproxy zap-extensions 0 ~ 4 -

II. Public POCs for CVE-2026-57527

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III. Intelligence Information for CVE-2026-57527

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Patches & Fixes for CVE-2026-57527 (2)

Vendor Advisories for CVE-2026-57527 (1)

Security Blog Posts for CVE-2026-57527 (1)

Vendor Pages for CVE-2026-57527 (1)

IV. Related Vulnerabilities

Same weakness: CWE-502