What is CVE-2026-57527?

CVE-2026-57527 is a high-severity vulnerability in Zaproxy Zap-extensions, classified under Deserialization of Untrusted Data. CVSS score: 8.8/10. Published 2026-06-26.

How severe is CVE-2026-57527?

High severity. CVSS v3 base score is 8.8 out of 10.

Deserialization in Zaproxy Zap-extensions

CVE-2026-57527

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…

Vulnerability class: Insecure Deserialization

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Zaproxy Zap-extensions — versions 0

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

disclosure@vulncheck.com (patch)
disclosure@vulncheck.com (issue-tracking)
disclosure@vulncheck.com (release-notes)
disclosure@vulncheck.com (third-party-advisory)
disclosure@vulncheck.com (vendor-advisory, technical-description)

Frequently asked questions

What is CVE-2026-57527?: CVE-2026-57527 is a high-severity vulnerability in Zaproxy Zap-extensions, classified under Deserialization of Untrusted Data. CVSS score: 8.8/10. Published 2026-06-26.
How severe is CVE-2026-57527?: High severity. CVSS v3 base score is 8.8 out of 10.