CVE-2026-57527

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM 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
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 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(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity88% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
38%
KEV
Not listed

Published

June 26, 2026

Last Modified

July 14, 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 18× in last 7d / 92× 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. 2026-07-27 14:14 UTCEPSS rescore
  2. 2026-07-27 02:23 UTCEG score recompute
  3. 2026-07-27 02:23 UTCGHSA enrichment
  4. 2026-07-26 14:54 UTCEPSS rescore
  5. 2026-07-26 14:54 UTCEPSS rescore
  6. 2026-07-26 14:35 UTCEG score recompute
  7. 2026-07-26 14:35 UTCGHSA enrichment
  8. 2026-07-25 14:18 UTCEPSS rescore
  9. 2026-07-25 14:18 UTCEPSS rescore
  10. 2026-07-24 14:18 UTCEPSS rescore
  11. 2026-07-24 14:18 UTCEPSS rescore
  12. 2026-07-23 14:18 UTCEPSS rescore
  13. 2026-07-23 14:18 UTCEPSS rescore
  14. 2026-07-23 03:20 UTCEG score recompute
  15. 2026-07-22 14:08 UTCEPSS rescore
  16. 2026-07-22 14:08 UTCEPSS rescore
  17. 2026-07-21 15:25 UTCEPSS rescore
  18. 2026-07-20 17:08 UTCEPSS rescore
  19. 2026-07-19 14:31 UTCEPSS rescore
  20. 2026-07-19 14:31 UTCEPSS rescore
  21. 2026-07-19 02:29 UTCEPSS rescore
  22. 2026-07-18 10:04 UTCEPSS rescore
  23. 2026-07-16 19:57 UTCGHSA enrichment
  24. 2026-07-16 17:03 UTCEPSS rescore
  25. 2026-07-16 07:49 UTCGHSA enrichment
Show 71 more
  1. 2026-07-15 20:01 UTCGHSA enrichment
  2. 2026-07-15 16:57 UTCEPSS rescore
  3. 2026-07-15 16:57 UTCEPSS rescore
  4. 2026-07-15 08:14 UTCGHSA enrichment
  5. 2026-07-15 02:00 UTCEPSS rescore
  6. 2026-07-15 02:00 UTCEPSS rescore
  7. 2026-07-14 20:26 UTCGHSA enrichment
  8. 2026-07-14 08:39 UTCGHSA enrichment
  9. 2026-07-13 22:31 UTCEPSS rescore
  10. 2026-07-13 20:51 UTCGHSA enrichment
  11. 2026-07-13 09:03 UTCGHSA enrichment
  12. 2026-07-13 06:13 UTCEPSS rescore
  13. 2026-07-13 06:13 UTCEPSS rescore
  14. 2026-07-12 21:15 UTCGHSA enrichment
  15. 2026-07-12 09:17 UTCGHSA enrichment
  16. 2026-07-12 05:46 UTCEPSS rescore
  17. 2026-07-11 21:29 UTCGHSA enrichment
  18. 2026-07-11 09:41 UTCGHSA enrichment
  19. 2026-07-11 08:27 UTCEPSS rescore
  20. 2026-07-11 08:27 UTCEPSS rescore
  21. 2026-07-10 21:54 UTCGHSA enrichment
  22. 2026-07-10 10:06 UTCGHSA enrichment
  23. 2026-07-09 22:18 UTCGHSA enrichment
  24. 2026-07-09 19:10 UTCEPSS rescore
  25. 2026-07-09 19:10 UTCEPSS rescore
  26. 2026-07-09 10:29 UTCGHSA enrichment
  27. 2026-07-08 22:41 UTCGHSA enrichment
  28. 2026-07-08 15:16 UTCEPSS rescore
  29. 2026-07-08 15:16 UTCEPSS rescore
  30. 2026-07-08 10:54 UTCGHSA enrichment
  31. 2026-07-07 23:07 UTCGHSA enrichment
  32. 2026-07-07 13:46 UTCEPSS rescore
  33. 2026-07-07 13:46 UTCEPSS rescore
  34. 2026-07-07 11:19 UTCGHSA enrichment
  35. 2026-07-06 23:32 UTCGHSA enrichment
  36. 2026-07-06 16:27 UTCEPSS rescore
  37. 2026-07-06 16:27 UTCEPSS rescore
  38. 2026-07-06 11:44 UTCGHSA enrichment
  39. 2026-07-06 02:23 UTCEPSS rescore
  40. 2026-07-06 02:23 UTCEPSS rescore
  41. 2026-07-05 23:54 UTCGHSA enrichment
  42. 2026-07-05 12:05 UTCGHSA enrichment
  43. 2026-07-05 02:31 UTCEPSS rescore
  44. 2026-07-05 02:30 UTCEPSS rescore
  45. 2026-07-05 00:17 UTCGHSA enrichment
  46. 2026-07-04 12:29 UTCGHSA enrichment
  47. 2026-07-04 06:31 UTCEPSS rescore
  48. 2026-07-04 06:31 UTCEPSS rescore
  49. 2026-07-04 00:41 UTCGHSA enrichment
  50. 2026-07-03 12:51 UTCGHSA enrichment
  51. 2026-07-03 01:03 UTCGHSA enrichment
  52. 2026-07-02 13:15 UTCGHSA enrichment
  53. 2026-07-02 01:27 UTCGHSA enrichment
  54. 2026-07-01 15:07 UTCEPSS rescore
  55. 2026-07-01 13:40 UTCGHSA enrichment
  56. 2026-07-01 01:52 UTCGHSA enrichment
  57. 2026-06-30 23:22 UTCEPSS rescore
  58. 2026-06-30 14:04 UTCGHSA enrichment
  59. 2026-06-30 02:15 UTCGHSA enrichment
  60. 2026-06-29 14:27 UTCGHSA enrichment
  61. 2026-06-29 14:06 UTCEPSS rescore
  62. 2026-06-29 02:40 UTCGHSA enrichment
  63. 2026-06-28 14:52 UTCGHSA enrichment
  64. 2026-06-28 14:07 UTCEPSS rescore
  65. 2026-06-28 04:56 UTCEPSS rescore
  66. 2026-06-28 03:04 UTCGHSA enrichment
  67. 2026-06-27 15:17 UTCGHSA enrichment
  68. 2026-06-27 03:29 UTCGHSA enrichment
  69. 2026-06-26 17:41 UTCNVD updateCVSS v4 → 8.7
  70. 2026-06-26 15:38 UTCEG score recompute
  71. 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, with the most recent update on July 14, 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 0% probability of exploitation in the next 30 days, which ranks it in the top 62.4% of all scored CVEs.
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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