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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 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
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:44eaf44e77ddc5f10f80c8eec84671309099fadb7bc62d38ab926ad562242a32
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:2aae1025e4c225d4046da27abd8a64d15e99adcb17c9039d50fd12ebee5c72ad · sha256:696e047fe9d3c5af… · /containers/cna/metrics/1/cvssV3_1

{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.7,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"PASSIVE","valueDensity":"NOT_DEFINED","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:2aae1025e4c225d4046da27abd8a64d15e99adcb17c9039d50fd12ebee5c72ad · sha256:696e047fe9d3c5af… · /containers/cna/metrics/0/cvssV4_0

Affected products and versions

1 source assertion
{"defaultStatus":"affected","packageURL":"pkg:github/zaproxy/zap-extensions","product":"zap-extensions","repo":"https://github.com/zaproxy/zap-extensions","vendor":"zaproxy","versions":[{"lessThan":"4","status":"affected","version":"0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:2aae1025e4c225d4046da27abd8a64d15e99adcb17c9039d50fd12ebee5c72ad · sha256:696e047fe9d3c5af… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:2aae1025e4c225d4046da27abd8a64d15e99adcb17c9039d50fd12ebee5c72ad · sha256:696e047fe9d3c5af… · /containers/cna/metrics/1/cvssV3_1
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.7,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"PASSIVE","valueDensity":"NOT_DEFINED","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:2aae1025e4c225d4046da27abd8a64d15e99adcb17c9039d50fd12ebee5c72ad · sha256:696e047fe9d3c5af… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-502","description":"Deserialization of Untrusted Data","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:2aae1025e4c225d4046da27abd8a64d15e99adcb17c9039d50fd12ebee5c72ad · sha256:696e047fe9d3c5af… · /containers/cna/problemTypes/0/descriptions/0

Source references

5 source assertions
{"tags":["patch"],"url":"https://github.com/zaproxy/zap-extensions/commit/ac6c3f94d38505bc0facea286a4d3728044c6e5c"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2aae1025e4c225d4046da27abd8a64d15e99adcb17c9039d50fd12ebee5c72ad · sha256:696e047fe9d3c5af… · /containers/cna/references/3
{"tags":["issue-tracking"],"url":"https://github.com/zaproxy/zap-extensions/pull/7481"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2aae1025e4c225d4046da27abd8a64d15e99adcb17c9039d50fd12ebee5c72ad · sha256:696e047fe9d3c5af… · /containers/cna/references/2
{"tags":["release-notes"],"url":"https://github.com/zaproxy/zap-extensions/releases/tag/viewstate-v4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2aae1025e4c225d4046da27abd8a64d15e99adcb17c9039d50fd12ebee5c72ad · sha256:696e047fe9d3c5af… · /containers/cna/references/1
{"tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/zap-viewstate-add-on-insecure-deserialization-via-jsfviewstate-decode"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2aae1025e4c225d4046da27abd8a64d15e99adcb17c9039d50fd12ebee5c72ad · sha256:696e047fe9d3c5af… · /containers/cna/references/4
{"tags":["technical-description","vendor-advisory"],"url":"https://www.zaproxy.org/blog/2026-06-24-java-deserialization-vulnerability-in-zap-viewstate-addon/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2aae1025e4c225d4046da27abd8a64d15e99adcb17c9039d50fd12ebee5c72ad · sha256:696e047fe9d3c5af… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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