CVE-2026-57527 Details
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.
A vulnerability allowing insecure deserialization has been identified in the Zed Attack Proxy (ZAP) ViewState add-on, versions prior to 4. This vulnerability allows attackers controlling a proxied web server to execute arbitrary code. The issue arises because the add-on's JSFViewState.decode() method decodes the javax.faces.ViewState HTTP response parameter and passes it directly to ObjectInputStream.readObject() without any deserialization filter or type restriction. As a result, a malicious serialized Java object can be deserialized within the ZAP Java Virtual Machine (JVM) when the Desktop UI displays the ViewState panel.
Users are advised to update to ZAP ViewState add-on version 4 or later, and to update to the latest version of ZAP (currently 2.17) as older versions may be vulnerable to remote code execution.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jun 26, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-502 | Deserialization of Untrusted Data | [email protected] |
Affected Products
No affected product data is available for this CVE.
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 14, 2026 | CVE Modified | [email protected] |
| Jun 26, 2026 | CVE Modified | CISA-ADP |
| Jun 26, 2026 | New CVE Received | [email protected] |