CVE-2026-92553Network attack vectorHinoki check available

Authenticated code execution via unchecked attachment extensions

Published Oct 16, 2026 · Updated Oct 16, 2026

File upload in YayCommerce YaySMTP 2.7.7 and earlier allows remote authenticated users to execute code via email attachments. The putFile function uses sanitize_file_name() but preserves executable extensions without an extension allowlist, MIME validation, or safe-extension rename. Subscriber-level access suffices; code execution requires executable uploads and ineffective writeGuards() .htaccess protection, as on nginx or Apache with AllowOverride None.

CVSS severity8.8
High
EPSS probability0.57%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

File upload in YayCommerce YaySMTP 2.7.7 and earlier allows remote authenticated users to execute code via email attachments. The putFile function uses sanitize_file_name() but preserves executable extensions without an extension allowlist, MIME validation, or safe-extension rename. Subscriber-level access suffices; code execution requires executable uploads and ineffective writeGuards() .htaccess protection, as on nginx or Apache with AllowOverride None.

The record

CVE
CVE-2026-92553
Published
Oct 16, 2026
Updated
Oct 16, 2026
Vendor
YayCommerce
Product
YaySMTP
Classifications
CWE-434, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 16, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=2.7.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

YayCommerce · YaySMTPversion=0 <=2.7.7

Published CVSS scores

8.8WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

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