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CVE-2026-4270

Improper Protection of Alternate Path exists in the no-access and workdir feature of the AWS API MCP Server versions >= 0.2.14 and < 1.3.9 on all platforms may allow the bypass of intended file access restriction and expose arbitrary local file contents in the MCP client application context. To remediate this issue, users should upgrade to version 1.3.9.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:38230cbc1e9f180de5a8318ed8fd165130d99d8067143a79fe0d94fb5a3f212f
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":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"LOCAL","baseScore":6.8,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"PASSIVE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:47e8630021b5e478f5d0440f88e3413da471f8852206391541680ac4df53c87a · sha256:b17aa9ce88f4d5b8… · /containers/cna/metrics/1/cvssV4_0

{"metric":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"NONE","baseScore":5.5,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:47e8630021b5e478f5d0440f88e3413da471f8852206391541680ac4df53c87a · sha256:b17aa9ce88f4d5b8… · /containers/cna/metrics/0/cvssV3_1

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","product":"AWS API MCP Server","vendor":"AWS","versions":[{"lessThan":"1.3.9","status":"affected","version":"0.2.14","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:47e8630021b5e478f5d0440f88e3413da471f8852206391541680ac4df53c87a · sha256:b17aa9ce88f4d5b8… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"LOCAL","baseScore":6.8,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"PASSIVE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:47e8630021b5e478f5d0440f88e3413da471f8852206391541680ac4df53c87a · sha256:b17aa9ce88f4d5b8… · /containers/cna/metrics/1/cvssV4_0
{"metric":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"NONE","baseScore":5.5,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:47e8630021b5e478f5d0440f88e3413da471f8852206391541680ac4df53c87a · sha256:b17aa9ce88f4d5b8… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-424","description":"CWE-424: Improper Protection of Alternate Path","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:47e8630021b5e478f5d0440f88e3413da471f8852206391541680ac4df53c87a · sha256:b17aa9ce88f4d5b8… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"tags":["vendor-advisory"],"url":"https://aws.amazon.com/security/security-bulletins/2026-007-AWS/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:47e8630021b5e478f5d0440f88e3413da471f8852206391541680ac4df53c87a · sha256:b17aa9ce88f4d5b8… · /containers/cna/references/0
{"tags":["patch"],"url":"https://pypi.org/project/awslabs.aws-api-mcp-server/1.3.9/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:47e8630021b5e478f5d0440f88e3413da471f8852206391541680ac4df53c87a · sha256:b17aa9ce88f4d5b8… · /containers/cna/references/1

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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