EIP-2026-103209

PRE-CVE

Qpopper 3/4 - 'Username' Information Disclosure

Title source: legacy
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for EIP-2026-103209. PoCs published by plasmahh.

AI-analyzed exploit summary This exploit leverages a timing-based information disclosure vulnerability in Qpopper to determine valid usernames. It measures the delay between authentication attempts to infer whether a username exists on the system.

Description

Qpopper 3/4 - 'Username' Information Disclosure

Exploits (1)

exploitdb WORKING POC VERIFIED
by plasmahh · c++remotelinux
https://www.exploit-db.com/exploits/22361

This exploit leverages a timing-based information disclosure vulnerability in Qpopper to determine valid usernames. It measures the delay between authentication attempts to infer whether a username exists on the system.

Classification
Working Poc 90%
Attack Type
Info Leak
Complexity
Trivial
Reliability
Reliable
Target: Qpopper 4.0.4 (and possibly other versions)
No auth needed
Prerequisites: Network access to the target POP3 service (port 110)
devstral-2 · analyzed Feb 16, 2026 Full analysis →

Details

Status pre_cve
Tracked Since Feb 18, 2026