CVE-2016-9909

MEDIUM

Html5lib < 0.99999999 - XSS

Title source: rule

Description

The serializer in html5lib before 0.99999999 might allow remote attackers to conduct cross-site scripting (XSS) attacks by leveraging mishandling of the < (less than) character in attribute values.

References (7)

Scores

CVSS v3 6.1
EPSS 0.0046
EPSS Percentile 64.0%
Attack Vector NETWORK
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Classification

CWE
CWE-79
Status published

Affected Products (3)

html5lib/html5lib < 0.99999999
pypi/html5lib < 0.999999999PyPI
n/a/n/a

Timeline

Published Feb 22, 2017
Tracked Since Feb 18, 2026