What is CVE-2018-3769?

CVE-2018-3769 is a medium-severity vulnerability in Ruby Grape Ruby-Grape Gem, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-07-05.

How severe is CVE-2018-3769?

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

XSS in Ruby Grape Ruby-Grape Gem

CVE-2018-3769

ruby-grape ruby gem suffers from a cross-site scripting (XSS) vulnerability via "format" parameter.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2018-07-05 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.014 (72.1th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 72nd percentile — 72.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

Ruby Grape Ruby-Grape Gem — versions >= 1.0.3
Ruby-Grape Grape

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/ruby-grape/grape/commit/6876b71efc7b03f7ce1be3f075eaa4e7e6de19af (Patch, Third Party Advisory)
github.com/ruby-grape/grape/issues/1762 (Exploit, Third Party Advisory, Issue Tracking)
github.com/ruby-grape/grape/pull/1763 (Third Party Advisory)

Frequently asked questions

What is CVE-2018-3769?: CVE-2018-3769 is a medium-severity vulnerability in Ruby Grape Ruby-Grape Gem, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-07-05.
How severe is CVE-2018-3769?: Medium severity. CVSS v3 base score is 6.1 out of 10.