What is CVE-2018-19790?

CVE-2018-19790 is a medium-severity vulnerability in Sensiolabs Symfony, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2018-12-18.

How severe is CVE-2018-19790?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Open Redirect in Sensiolabs Symfony

CVE-2018-19790

An open redirect was discovered in Symfony 2.7.x before 2.7.50, 2.8.x before 2.8.49, 3.x before 3.4.20, 4.0.x before 4.0.15, 4.1.x before 4.1.9 and 4.2.x before 4.2.1. By using backslashes in the `_failure_path` input field of login forms, an attacker can work around the redirection target restrictions and effectively redirect the user to any domain after login.

Vulnerability class: Open Redirect

Published 2018-12-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.015 (73.0th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 73rd percentile — 73.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000

Affected products

Sensiolabs Symfony
Debian Linux — versions 8.0
Fedoraproject Fedora — versions 28

Weakness classification (CWE)

CWE-601 — URL Redirection to Untrusted Site (Open Redirect)

References

lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
www.securityfocus.com/bid/106249 (VDB Entry, Third Party Advisory, vdb-entry)
lists.debian.org/debian-lts-announce/2019/03/msg00009.html (mailing-list, Mailing List, Third Party Advisory)
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
symfony.com/blog/cve-2018-19790-open-redirect-vulnerability-when-using-security… (Patch, Vendor Advisory)
www.debian.org/security/2019/dsa-4441 (vendor-advisory)
seclists.org/bugtraq/2019/May/21 (mailing-list)

Frequently asked questions

What is CVE-2018-19790?: CVE-2018-19790 is a medium-severity vulnerability in Sensiolabs Symfony, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2018-12-18.
How severe is CVE-2018-19790?: Medium severity. CVSS v3 base score is 6.1 out of 10.