CVE Catalog

CVE-2026-57527

HighCVSS 8.8
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.46%

37th percentile - higher than 37% of all known CVEs

Summary

The ViewState add-on for Zed Attack Proxy (ZAP) before version 4 contains an insecure deserialization vulnerability that allows attackers controlling 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.

Risk Assessment

An attacker can take control of the ZAP instance, leading to a breach of confidentiality and integrity of data processed by the tool, and potentially escalating the attack to other systems on the network.

Recommendation

Immediately update the ViewState add-on to version 4 or later, which includes a fix that eliminates the insecure deserialization vulnerability.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS