CVE-2026-57527

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-26. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
8.8
EG Score
8.8(high)
EPSS
36.9%
KEV
Not listed

Published

June 26, 2026

Last Modified

June 26, 2026

Advisory Details (5)

Auto-updated Jun 26, 2026
Patch available. Sources: github_commit, github_pr, github_release.
generic

ZAP – Java Deserialization Vulnerability in ZAP Viewstate Add-on

https://www.zaproxy.org/blog/2026-06-24-java-deserialization-vulnerability-in-zap-viewstate-addon/
generic

ZAP ViewState Add-on Insecure Deserialization via JSFViewState.decode() | Advisories | VulnCheck

https://www.vulncheck.com/advisories/zap-viewstate-add-on-insecure-deserialization-via-jsfviewstate-decode
github_release Patch Available

ViewState version 4

Patch available: zaproxy/zap-extensions viewstate-v4

https://github.com/zaproxy/zap-extensions/releases/tag/viewstate-v4
github_pr Patch Available

viewstate: disable format

Patch available: zaproxy/zap-extensions viewstate-v4 (PR #7481 merged 2026-06-24)

https://github.com/zaproxy/zap-extensions/pull/7481
github_commit Patch Available

commit ac6c3f94d385 (zaproxy/zap-extensions)

Patch available: zaproxy/zap-extensions viewstate-v4 (contains commit ac6c3f94d385)

https://github.com/zaproxy/zap-extensions/commit/ac6c3f94d38505bc0facea286a4d3728044c6e5c

Vendor Advisories for CVE-2026-57527(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 38× in last 7d / 58× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-06 23:32 UTCEG score recompute
  2. 2026-07-06 23:32 UTCGHSA enrichment
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 16:27 UTCEPSS rescore
  5. 2026-07-06 11:44 UTCEG score recompute
  6. 2026-07-06 11:44 UTCGHSA enrichment
  7. 2026-07-06 02:23 UTCEPSS rescore
  8. 2026-07-06 02:23 UTCEPSS rescore
  9. 2026-07-05 23:54 UTCEG score recompute
  10. 2026-07-05 23:54 UTCGHSA enrichment
  11. 2026-07-05 12:05 UTCEG score recompute
  12. 2026-07-05 12:05 UTCGHSA enrichment
  13. 2026-07-05 02:31 UTCEPSS rescore
  14. 2026-07-05 02:30 UTCEPSS rescore
  15. 2026-07-05 00:17 UTCEG score recompute
  16. 2026-07-05 00:17 UTCGHSA enrichment
  17. 2026-07-04 12:29 UTCEG score recompute
  18. 2026-07-04 12:29 UTCGHSA enrichment
  19. 2026-07-04 06:31 UTCEPSS rescore
  20. 2026-07-04 06:31 UTCEPSS rescore
  21. 2026-07-04 00:41 UTCEG score recompute
  22. 2026-07-04 00:41 UTCGHSA enrichment
  23. 2026-07-03 12:51 UTCEG score recompute
  24. 2026-07-03 12:51 UTCGHSA enrichment
  25. 2026-07-03 01:04 UTCEG score recompute
Show 33 more
  1. 2026-07-03 01:03 UTCGHSA enrichment
  2. 2026-07-02 13:16 UTCEG score recompute
  3. 2026-07-02 13:15 UTCGHSA enrichment
  4. 2026-07-02 01:27 UTCEG score recompute
  5. 2026-07-02 01:27 UTCGHSA enrichment
  6. 2026-07-01 15:07 UTCEPSS rescore
  7. 2026-07-01 13:40 UTCEG score recompute
  8. 2026-07-01 13:40 UTCGHSA enrichment
  9. 2026-07-01 01:52 UTCEG score recompute
  10. 2026-07-01 01:52 UTCGHSA enrichment
  11. 2026-06-30 23:22 UTCEPSS rescore
  12. 2026-06-30 14:04 UTCEG score recompute
  13. 2026-06-30 14:04 UTCGHSA enrichment
  14. 2026-06-30 02:15 UTCEG score recompute
  15. 2026-06-30 02:15 UTCGHSA enrichment
  16. 2026-06-29 14:27 UTCEG score recompute
  17. 2026-06-29 14:27 UTCGHSA enrichment
  18. 2026-06-29 14:06 UTCEPSS rescore
  19. 2026-06-29 02:40 UTCEG score recompute
  20. 2026-06-29 02:40 UTCGHSA enrichment
  21. 2026-06-28 14:52 UTCEG score recompute
  22. 2026-06-28 14:52 UTCGHSA enrichment
  23. 2026-06-28 14:07 UTCEPSS rescore
  24. 2026-06-28 04:56 UTCEPSS rescore
  25. 2026-06-28 03:04 UTCEG score recompute
  26. 2026-06-28 03:04 UTCGHSA enrichment
  27. 2026-06-27 15:17 UTCEG score recompute
  28. 2026-06-27 15:17 UTCGHSA enrichment
  29. 2026-06-27 03:29 UTCEG score recompute
  30. 2026-06-27 03:29 UTCGHSA enrichment
  31. 2026-06-26 17:41 UTCNVD updateCVSS v4 → 8.7
  32. 2026-06-26 15:38 UTCEG score recompute
  33. 2026-06-26 15:38 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-57527?
CVE-2026-57527 is a high vulnerability published on June 26, 2026. 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…
When was CVE-2026-57527 disclosed?
CVE-2026-57527 was first published in the National Vulnerability Database on June 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-57527 actively exploited?
CVE-2026-57527 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 36.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-57527?
CVE-2026-57527 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-57527?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-57527, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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