What is CVE-2018-1000883?

CVE-2018-1000883 is a medium-severity vulnerability in Plug Project, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2018-12-20.

How severe is CVE-2018-1000883?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Improper input validation in Plug Project

CVE-2018-1000883

Elixir Plug Plug version All contains a Header Injection vulnerability in Connection that can result in Given a cookie value, Headers can be added. This attack appear to be exploitable via Crafting a value to be sent as a cookie. This vulnerability appears to have been fixed in >= 1.3.5 or ~> 1.2.5 or ~> 1.1.9 or ~> 1.0.6.

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

Published 2018-12-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.011 (65.2th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 65.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Plug Project

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

github.com/elixir-plug/plug/commit/8857f8ab4acf9b9c22e80480dae2636692f5f573 (Patch, Third Party Advisory)
github.com/dependabot/elixir-security-advisories/blob/master/packages/plug/2017… (Third Party Advisory)

Frequently asked questions

What is CVE-2018-1000883?: CVE-2018-1000883 is a medium-severity vulnerability in Plug Project, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2018-12-20.
How severe is CVE-2018-1000883?: Medium severity. CVSS v3 base score is 6.5 out of 10.