CVE-2018-3740

A specially crafted HTML fragment can cause Sanitize gem for Ruby to allow non-whitelisted attributes to be used on a whitelisted HTML element.

Published: 2018-03-30 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2018-3740 is rated Moderate Risk (56.2/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.52%). EPSS rose +1.27% over the last day, indicating growing attacker interest. Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2018-3740

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.25% 1.52% +1.27%
2 2025-03-30 0.86% 0.25% -0.61%
3 2025-03-29 — 0.86% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2018-3740

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.0 HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2018-3740

GitHub Security Advisory for CVE-2018-3740

GHSA-7f42-p84j-f58p · Severity: high · Ecosystem: rubygems — Sanitize vulnerable to Improper Input Validation and Cross-site Scripting

OS Trackers for CVE-2018-3740

vendor priority summary link
debian not yet assigned CVE-2018-3740 not yet assigned priority: Debian including 1 source packages (ruby-sanitize), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2018-3740
ubuntu medium CVE-2018-3740 medium priority: Ubuntu including 1 source packages (ruby-sanitize), 6 status rows across 6 suites (artful, bionic, cosmic, trusty, upstream, xenial): released 3, DNE 1, ignored 1, not-affected 1. https://ubuntu.com/security/CVE-2018-3740

Affected software / configurations for CVE-2018-3740

Vendor Product Version Raw CPE
sanitize_project sanitize <= 4.6.0 cpe:2.3:a:sanitize_project:sanitize:*:*:*:*:*:ruby:*:*

References for CVE-2018-3740

cvelogic Threat Intelligence