CVE-2026-86009CWE-285CWE-863broken-access-control

CVE-2026-86009

published October 16, 2026

CVSS
8.2
EPSS
0%
Percentile
21.3
In the wild
Unconfirmed
What it is

Mailu is a mail server distributed as a set of Docker images. Prior to f05aeb8322e2f61096af6b089d61ba6f40587d96, domain managers can enable spoofing for hosted domains they do not control. A potentially malicious domain administrator enables spoofing for another hosted domain and can send emails that are authenticated with DKIM/SPF for domains they should not be able to. This vulnerability is addressed by f05aeb8322e2f61096af6b089d61ba6f40587d96.

The record
Technical detail
CVSS
8.2 · NONE
CVSS v4.0
8.2 · CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N
EPSS
0.00297 · 21.3th percentile
Weaknesses
CWE-285 · Improper Authorization; CWE-863 · Incorrect Authorization
Published
2026-10-16T21:17Z
References (5)
https://github.com/Mailu/Mailu/commit/f05aeb8322e2f61096af6b089d61ba6f40587d96 · [email protected]https://github.com/Mailu/Mailu/issues/2686 · [email protected]https://github.com/Mailu/Mailu/pull/4072 · [email protected]https://github.com/Mailu/Mailu/security/advisories/GHSA-crww-m82r-2wfm · [email protected]https://github.com/Mailu/Mailu/issues/2686 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 18 OCT 03:32Z
    EPSS moved — → 0%
    epss
  • 16 OCT 16:19Z
    Mailu: Domain managers can allow themselves to spoof on other hosted domains they should not control
    cvelistv5
  • 16 OCT 16:19Z
    Mailu: Domain managers can allow themselves to spoof on other hosted domains they should not control
    cvelistv5