What is CVE-2018-11686?

CVE-2018-11686 is a critical-severity vulnerability in Flowpaper Flexpaper, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2019-07-03.

How severe is CVE-2018-11686?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2018-11686 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Improper input validation in Flowpaper Flexpaper

CVE-2018-11686

The Publish Service in FlexPaper (later renamed FlowPaper) 2.3.6 allows remote code execution via setup.php and change_config.php.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2019-07-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.525 (99.0th percentile), scored 2026-10-26.

High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 99.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.525 · newest: 0.525 · change: 0.000

Affected products

Flowpaper Flexpaper

Weakness classification (CWE)

CWE-20 — Improper Input Validation

Public proof-of-concept exploits

References

flowpaper.com/blog/ (Third Party Advisory, Release Notes)
redtimmysec.wordpress.com/2019/03/07/flexpaper-remote-code-execution (Exploit, Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2018-11686?: CVE-2018-11686 is a critical-severity vulnerability in Flowpaper Flexpaper, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2019-07-03.
How severe is CVE-2018-11686?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2018-11686 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.