VulnerabilityPublished 13 Sep 2026Updated 14 Sep 2026

CVE-2026-90513: simalexan api-lambda-send-email-ses · Missing Authentication

Affects simalexan api-lambda-send-email-sesSource CVE Database V5

Not known to be exploited · CVSS 6.9 Medium · patch available : update simalexan api-lambda-send-email-ses when convenient.

Data as of 29 Oct 2026, 10:10 UTC

CVSS 4.0 base score

6.9Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.7% chance of exploitation in 30 days – higher than 55% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available

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

Attack Vector: Network
Attack Complexity: Low
Attack Requirements: None
Privileges Required: None
User Interaction: None
Vulnerable system confidentiality: None
Vulnerable system integrity: Low
Vulnerable system availability: Low
Subsequent system confidentiality: None
Subsequent system integrity: None
Subsequent system availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Attack Requirements: None: The successful attack does not depend on the deployment and execution conditions of the vulnerable system. The attacker can expect to be able to reach the vulnerability and execute the exploit under all or most instances of the vulnerability.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without interaction from any human user, other than the attacker.
Vulnerable system confidentiality: None: There is no loss of confidentiality within the Vulnerable System.
Vulnerable system integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact to the Vulnerable System.
Vulnerable system availability: Low: Performance is reduced or there are interruptions in resource availability. Even if repeated exploitation of the vulnerability is possible, the attacker does not have the ability to completely deny service to legitimate users. The resources in the Vulnerable System are either partially available all of the time, or fully available only some of the time, but overall there is no direct, serious consequence to the Vulnerable System.
Subsequent system confidentiality: None: There is no loss of confidentiality within the Subsequent System or all confidentiality impact is constrained to the Vulnerable System.
Subsequent system integrity: None: There is no loss of integrity within the Subsequent System or all integrity impact is constrained to the Vulnerable System.
Subsequent system availability: None: There is no impact to availability within the Subsequent System or all availability impact is constrained to the Vulnerable System.

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 13 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-4cj2-3xxr-fv5p

What to do

Affected software

Product	Affected	Fixed in
simalexanapi-lambda-send-email-ses	Affected =bda6869aa81371d1e872242e74fe7d953edb818d	Fixed in–

CPE configurations (1)

cpe:2.3:a:simalexan:api-lambda-send-email-ses:*:*:*:*:*:*:*:*

AI-suggested

A patch is available for this vulnerability. Since the product is a cloud-hosted service, the vendor typically manages remediation server-side. Users should monitor the vendor's advisory for confirmation of patch deployment and ensure their instances are updated accordingly once the vendor responds.

Description

CVE-2026-90513 is a medium severity vulnerability in the simalexan api-lambda-send-email-ses component. It involves missing authentication in the SES.sendEmail function of the API Gateway Endpoint, allowing remote attackers to manipulate email parameters such as toEmails, ccEmails, replyToEmails, subject, and message. The vendor has been informed but has not yet responded. A patch is available, and since this is a cloud service, the vendor typically manages remediation server-side.

Impact

The vulnerability allows unauthenticated remote attackers to invoke the SES.sendEmail function with manipulated email parameters, potentially enabling unauthorized email sending through the API Gateway Endpoint. This could lead to misuse of the email sending functionality, such as spam or phishing emails sent from the service. No known active exploitation has been reported.

Summary

This vulnerability affects the simalexan api-lambda-send-email-ses component up to commit bda6869aa81371d1e872242e74fe7d953edb818d. The flaw is in the SES.sendEmail function defined in template.yml of the API Gateway Endpoint, where manipulation of email-related arguments leads to missing authentication. The issue can be exploited remotely without privileges or user interaction. The vendor has been notified but has not yet issued a response or detailed advisory. Patch availability is indicated, and as a cloud service, vendor-managed remediation is expected.

References

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