CVE-2026-47074 (GCVE-0-2026-47074)

Vulnerability from cvelistv5 – Published: 2026-05-28 09:05 – Updated: 2026-05-29 04:40
VLAI
Title
ex_aws_sns SigningCertURL not validated in verify_message/1
Summary
Improper Certificate Validation vulnerability in ex-aws ex_aws_sns (ExAws.SNS, ExAws.SNS.PublicKeyCache modules) allows Signature Spoofing by Improper Validation. This vulnerability is associated with program files lib/ex_aws/sns.ex, lib/ex_aws/sns/public_key_cache.ex and program routines 'Elixir.ExAws.SNS':verify_message/1, 'Elixir.ExAws.SNS.PublicKeyCache':get/1. 'Elixir.ExAws.SNS':verify_message/1 fetches the signing certificate from the SigningCertURL field of the incoming SNS message without validating that the URL uses HTTPS or that the host matches an AWS-owned SNS certificate domain. An unauthenticated attacker who can POST to an endpoint that calls verify_message/1 can supply an attacker-controlled SigningCertURL, sign a forged SNS message with their own key, and cause the function to return :ok, completely bypassing SNS signature verification. This issue affects ex_aws_sns: from 2.0.1 before 2.3.5.
Severity
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
CWE
  • CWE-295 - Improper Certificate Validation
Assigner
EEF
References
Impacted products
Vendor Product Version
ex-aws ex_aws_sns Affected: 2.0.1 , < 2.3.5 (semver)
    cpe:2.3:a:ex_aws_sns_project:ex_aws_sns:*:*:*:*:*:*:*:*
 Create a notification for this product.
ex-aws ex_aws_sns Affected: a7ec21880943f4dac1d59bda557db0ffcd2b61fa , < 1853d280b152d10384a1e21a22cf22152a60be48 (git)
    cpe:2.3:a:ex_aws_sns_project:ex_aws_sns:*:*:*:*:*:*:*:*
 Create a notification for this product.
Credits
Peter Ullrich Bernard Duggan Jonatan Männchen / EEF Jonatan Männchen / EEF
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An unauthenticated attacker who can POST to an endpoint that calls verify_message/1 can supply an attacker-controlled SigningCertURL, sign a forged SNS message with their own key, and cause the function to return :ok, completely bypassing SNS signature verification.\\n\\nThis issue affects ex_aws_sns: from 2.0.1 before 2.3.5.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Improper Certificate Validation vulnerability in ex-aws ex_aws_sns (\u003ctt\u003eExAws.SNS\u003c/tt\u003e, \u003ctt\u003eExAws.SNS.PublicKeyCache\u003c/tt\u003e modules) allows Signature Spoofing by Improper Validation.\u003cp\u003eThis vulnerability is associated with program files \u003ctt\u003elib/ex_aws/sns.ex\u003c/tt\u003e, \u003ctt\u003elib/ex_aws/sns/public_key_cache.ex\u003c/tt\u003e and program routines \u003ctt\u003e\u0027Elixir.ExAws.SNS\u0027:verify_message/1\u003c/tt\u003e, \u003ctt\u003e\u0027Elixir.ExAws.SNS.PublicKeyCache\u0027:get/1\u003c/tt\u003e.\u003c/p\u003e\u003cp\u003e\u003ctt\u003e\u0027Elixir.ExAws.SNS\u0027:verify_message/1\u003c/tt\u003e fetches the signing certificate from the \u003ctt\u003eSigningCertURL\u003c/tt\u003e field of the incoming SNS message without validating that the URL uses HTTPS or that the host matches an AWS-owned SNS certificate domain. An unauthenticated attacker who can POST to an endpoint that calls \u003ctt\u003everify_message/1\u003c/tt\u003e can supply an attacker-controlled \u003ctt\u003eSigningCertURL\u003c/tt\u003e, sign a forged SNS message with their own key, and cause the function to return \u003ctt\u003e:ok\u003c/tt\u003e, completely bypassing SNS signature verification.\u003c/p\u003e\u003cp\u003eThis issue affects ex_aws_sns: from 2.0.1 before 2.3.5.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-295\", \"description\": \"CWE-295 Improper Certificate Validation\"}]}], \"configurations\": [{\"lang\": \"en\", \"value\": \"The application must expose an HTTP endpoint that calls \u0027Elixir.ExAws.SNS\u0027:verify_message/1 on incoming request bodies.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eThe application must expose an HTTP endpoint that calls \u003ctt\u003e\u0027Elixir.ExAws.SNS\u0027:verify_message/1\u003c/tt\u003e on incoming request bodies.\u003c/p\u003e\", \"base64\": false}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:ex_aws_sns_project:ex_aws_sns:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"2.3.5\", \"versionStartIncluding\": \"2.0.1\"}], \"operator\": \"AND\"}], \"operator\": \"OR\"}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-05-28T09:05:54.815Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-47074\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-28T10:31:15.111Z\", \"dateReserved\": \"2026-05-18T17:28:08.322Z\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"datePublished\": \"2026-05-28T09:05:54.815Z\", \"assignerShortName\": \"EEF\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.