CVE-2026-84697Network attack vectorHinoki check available

SSRF via incomplete internal IP deny list

Published Sep 2, 2026 · Updated Sep 2, 2026

SSRF in Axllent Mailpit 1.31.0 and earlier allows remote attackers to access internal resources through crafted message links. IsInternalIP omits the Azure WireServer address and fails to decode the RFC 2765/6145 IPv4-translated IPv6 prefix before applying internal-address checks. Exploitation requires access to submit message content and invoke the link check API or proxy endpoint, exposing responses from reachable internal resources.

CVSS severity5.3
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

SSRF in Axllent Mailpit 1.31.0 and earlier allows remote attackers to access internal resources through crafted message links. IsInternalIP omits the Azure WireServer address and fails to decode the RFC 2765/6145 IPv4-translated IPv6 prefix before applying internal-address checks. Exploitation requires access to submit message content and invoke the link check API or proxy endpoint, exposing responses from reachable internal resources.

The record

CVE
CVE-2026-84697
Published
Sep 2, 2026
Updated
Sep 2, 2026
Vendor
Axllent
Product
Mailpit
Classifications
CWE-918, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 2, 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 <=1.31.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Axllent · Mailpitversion=0 <=1.31.0

Published CVSS scores

6.9VulnCheck CNACVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
5.3VulnCheck CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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