Vulnerability-Lookup

GHSA-GRQ4-7PWR-9RMP

Vulnerability from github – Published: 2026-06-26 15:32 – Updated: 2026-06-26 15:32

Details

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.

Severity

8.8 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

8.7 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-57527"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-502"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-26T15:16:49Z",
    "severity": "HIGH"
  },
  "details": "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.",
  "id": "GHSA-grq4-7pwr-9rmp",
  "modified": "2026-06-26T15:32:17Z",
  "published": "2026-06-26T15:32:17Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-57527"
    },
    {
      "type": "WEB",
      "url": "https://github.com/zaproxy/zap-extensions/pull/7481"
    },
    {
      "type": "WEB",
      "url": "https://github.com/zaproxy/zap-extensions/commit/ac6c3f94d38505bc0facea286a4d3728044c6e5c"
    },
    {
      "type": "WEB",
      "url": "https://github.com/zaproxy/zap-extensions/releases/tag/viewstate-v4"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/zap-viewstate-add-on-insecure-deserialization-via-jsfviewstate-decode"
    },
    {
      "type": "WEB",
      "url": "https://www.zaproxy.org/blog/2026-06-24-java-deserialization-vulnerability-in-zap-viewstate-addon"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-57527 (GCVE-0-2026-57527)

Vulnerability from cvelistv5 – Published: 2026-06-26 14:43 – Updated: 2026-06-26 16:31 X_Open Source

Title

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

Summary

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-502 - Deserialization of Untrusted Data

Assigner

VulnCheck

References

5 references

URL	Tags
https://www.zaproxy.org/blog/2026-06-24-java-dese…	technical-descriptionvendor-advisory
https://github.com/zaproxy/zap-extensions/release…	release-notes
https://github.com/zaproxy/zap-extensions/pull/7481	issue-tracking
https://github.com/zaproxy/zap-extensions/commit/…	patch
https://www.vulncheck.com/advisories/zap-viewstat…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
zaproxy	zap-extensions	Affected: 0 , < 4 (custom)

Date Public

2026-06-24 00:00

Credits

Neo by ProjectDiscovery

Show details on NVD website

JSON

To clipboard

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                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-26T16:28:16.504067Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
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    "cna": {
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    "datePublished": "2026-06-26T14:43:32.982Z",
    "dateReserved": "2026-06-24T15:58:58.538Z",
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-GRQ4-7PWR-9RMP

CVE-2026-57527 (GCVE-0-2026-57527)

Tags

Sightings

Nomenclature