CVE-2026-61638Network attack vector

Internal network probing via unvalidated SMTP destination

Published Aug 31, 2026 · Updated Sep 1, 2026

SSRF in Wallos before 4.9.6 allows remote authenticated users to probe internal services through the test-email notification endpoint. The endpoint passes POST-supplied smtpaddress and smtpport values to PHPMailer without applying the available SSRF destination validation. Any authenticated account can supply the destination, exposing reachable internal services and cloud metadata to connection probes.

CVSS severity8.2
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Wallos before 4.9.6 allows remote authenticated users to probe internal services through the test-email notification endpoint. The endpoint passes POST-supplied smtpaddress and smtpport values to PHPMailer without applying the available SSRF destination validation. Any authenticated account can supply the destination, exposing reachable internal services and cloud metadata to connection probes.

The record

CVE
CVE-2026-61638
Published
Aug 31, 2026
Updated
Sep 1, 2026
Vendor
ellite
Product
Wallos
Classifications
CWE-918, T1046
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 1, 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=< 4.9.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ellite · Wallosversion=< 4.9.6

Published CVSS scores

8.2GitHubCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1046Network Service Discovery

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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