CVE-2026-90513Network attack vector

Unauthenticated email sending via unprotected API endpoint

Published Sep 13, 2026 · Updated Sep 13, 2026

Missing authentication in API Gateway Lambda Send Email SES allows remote attackers to send arbitrary email through its POST /send endpoint. The template.yml API method exposes SES.sendEmail without an authorizer, while the Lambda forwards attacker-controlled recipient, copy, reply-to, subject, and message values to SES. Network access to a deployed endpoint is sufficient to send mail from the configured, SES-verified sender; no data-read or service-interruption impact is reported.

CVSS severityUnavailable
Unscored
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authentication in API Gateway Lambda Send Email SES allows remote attackers to send arbitrary email through its POST /send endpoint. The template.yml API method exposes SES.sendEmail without an authorizer, while the Lambda forwards attacker-controlled recipient, copy, reply-to, subject, and message values to SES. Network access to a deployed endpoint is sufficient to send mail from the configured, SES-verified sender; no data-read or service-interruption impact is reported.

The record

CVE
CVE-2026-90513
Published
Sep 13, 2026
Updated
Sep 13, 2026
Vendor
Aleksandar Simovic
Product
API Gateway Lambda Send Email SES
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=bda6869aa81371d1e872242e74fe7d953edb818d

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Aleksandar Simovic · API Gateway Lambda Send Email SESversion=bda6869aa81371d1e872242e74fe7d953edb818d

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

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Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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