CVE-2026-36340Public exploitNetwork attack vector

Authenticated code execution via executable email attachment

Published Apr 30, 2026 · Updated Apr 30, 2026

Code injection in Krayin CRM 2.1.5 allows remote authenticated users to execute arbitrary PHP through the compose-email attachment upload. The POST /admin/mail/create handler accepts a PHP attachment without extension or MIME validation and stores it in a web-accessible directory. Any authenticated CRM account that can compose email can upload a web shell, then request its storage URL to run code with the web server's privileges.

CVSS severity8.1
High
EPSS probability0.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Krayin CRM 2.1.5 allows remote authenticated users to execute arbitrary PHP through the compose-email attachment upload. The POST /admin/mail/create handler accepts a PHP attachment without extension or MIME validation and stores it in a web-accessible directory. Any authenticated CRM account that can compose email can upload a web shell, then request its storage URL to run code with the web server's privileges.

The record

CVE
CVE-2026-36340
Published
Apr 30, 2026
Updated
Apr 30, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-94, T1505.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 30, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

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.

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

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1505.003Server Software Component: Web Shell

Public exploit references

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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