CVE-2026-4215Public exploitNetwork attack vector

Admin-level SSRF via unchecked SMTP host

Published Mar 16, 2026 · Updated Mar 16, 2026

SSRF in FlowCI flow-core-x 1.23.01 allows remote authenticated users to make the server connect to attacker-selected SMTP endpoints. ConfigServiceImpl.Save stores option.getServer() without destination checks, and the email trigger supplies it to JavaMailSender as the SMTP host. Default RBAC restricts both actions to administrators; the SMTP sink supports internal reachability probing, outbound-policy bypass, and connection delays rather than direct HTTP data retrieval.

CVSS severity6.3
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in FlowCI flow-core-x 1.23.01 allows remote authenticated users to make the server connect to attacker-selected SMTP endpoints. ConfigServiceImpl.Save stores option.getServer() without destination checks, and the email trigger supplies it to JavaMailSender as the SMTP host. Default RBAC restricts both actions to administrators; the SMTP sink supports internal reachability probing, outbound-policy bypass, and connection delays rather than direct HTTP data retrieval.

The record

CVE
CVE-2026-4215
Published
Mar 16, 2026
Updated
Mar 16, 2026
Vendor
FlowCI
Product
flow-core-x
Classifications
CWE-918, T1046
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Mar 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 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=1.23.01

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

FlowCI · flow-core-xversion=1.23.01

Published CVSS scores

2.1VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
6.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
6.5VulDBAV:N/AC:L/Au:S/C:P/I:P/A:P

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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

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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