CVE-2026-35504

SMTPS message manipulation via unfiltered sender address

Published May 12, 2026 · Updated May 12, 2026

CRLF injection in SUBNET Solutions PowerSYSTEM Center allows remote authenticated users on adjacent networks to alter SMTPS messages. The email notification service accepts CRLF sequences in the Send from Address setting when constructing SMTPS communication, but CISA discloses no deeper code-level locus. Reachability requires authenticated access to Notification Settings; CISA does not specify the resulting message changes or service behavior.

CVSS severity5.1
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CRLF injection in SUBNET Solutions PowerSYSTEM Center allows remote authenticated users on adjacent networks to alter SMTPS messages. The email notification service accepts CRLF sequences in the Send from Address setting when constructing SMTPS communication, but CISA discloses no deeper code-level locus. Reachability requires authenticated access to Notification Settings; CISA does not specify the resulting message changes or service behavior.

The record

CVE
CVE-2026-35504
Published
May 12, 2026
Updated
May 12, 2026
Vendor
SUBNET Solutions Inc.
Product
PowerSYSTEM Center
Classifications
CWE-93, T1078
Attack vector
adjacent
Privileges
authenticated

Timeline

How it unfolded

  1. May 12, 2026CVE publishedPublication date reported by the CVE source.
  2. May 12, 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 <=5.28.x
  2. Affected versionversion=6.0.x <=6.1.x
  3. Affected versionversion=7.0.x

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesauthenticated

What is affected?

SUBNET Solutions Inc. · PowerSYSTEM Centerversion=0 <=5.28.x; version=6.0.x <=6.1.x; version=7.0.x

Published CVSS scores

5.5ICS-CERTCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
5.1ICS-CERTCVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA: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)
Vectoradjacent
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-93Improper Neutralization of CRLF Sequences ('CRLF Injection')
T1078Valid Accounts

Public exploit references

No public exploit references are available in this record.

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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