CVE-2026-84697CWE-918ssrf

CVE-2026-84697

Medium · published September 2, 2026

CVSS v3.1

5.3

EPSS

Percentile

32.8

In the wild

Unconfirmed

What it is

Mailpit's IsInternalIP deny list function fails to block the Azure WireServer address 168.63.129.16 and the RFC 2765/6145 IPv4-translated IPv6 prefix, allowing server-side request forgery to internal destinations. Attackers can supply hostnames resolving to these addresses in message content to reach the link check API and proxy endpoint for accessing internal resources.

The record

Technical detail

CVSS v3.1: 5.3 · MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CVSS v4.0: 6.9 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
EPSS: 0.00397 · 32.8th percentile
Weakness: CWE-918 · Server-Side Request Forgery (SSRF)
Published: 2026-09-02T05:17Z

References (4)

https://github.com/axllent/mailpit · [email protected]https://github.com/axllent/mailpit/blob/v1.31.0/internal/tools/net.go · [email protected]https://github.com/axllent/mailpit/commit/a02821bf3424da9196e156c422370f4868a1dff2 · [email protected]https://www.vulncheck.com/advisories/mailpit-ssrf-deny-list-bypass-via-azure-metadata-and-ipv6-prefix · [email protected]

EPSS history

Timeline

03 SEP 03:32Z
EPSS moved — → 0%
epss
02 SEP 00:37Z
Mailpit SSRF Deny List Bypass via Azure Metadata and IPv6 Prefix
cvelistv5