SEPTEMBER 17, 2026
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Case File

CVE-2026-42008

MEDIUM · CVSS 4.3 EPSS 0.19% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-08-28 · Last synced 2026-09-17

CyberRota Analysis

AI-Generated

Dovecot is vulnerable due to improper separation of forwarded authentication information from trusted proxies, allowing an attacker to authenticate as any user without needing their password. This poses a medium risk primarily to deployments that utilize a password database allowing authentication without a password and have misconfigured trusted proxies. Organizations using Dovecot should prioritize addressing this vulnerability by restricting trusted proxy networks and updating to a secure version.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Detected Signals
exploit

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-42008
Severity
MEDIUM
CVSS
4.3
EPSS
0.19%

Original NVD Description

Forwarding information received from a host listed as a trusted proxy is not kept separate from Dovecot's own authentication fields, so a value sent by that host can be injected as an internal authentication field. Any host permitted to act as a trusted proxy can authenticate as any user without knowing that user's password. This affects deployments whose password database honours a field that permits authentication without a password. Deployments that do not configure trusted proxies are not affected. Restrict the list of trusted proxy networks to hosts that are fully under your control. Update to non-vulnerable version. No publicly available exploits are known.