Predictive Vulnerability Intelligence.

Product

  • Product
  • Pricing
  • Documentation

Company

  • About
  • Partnerships
  • Blog
  • Support

Legal

  • Terms
  • Privacy
  • Data Licensing

© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2016-9910

22
FAUCET Score

CVE-2016-9910 describes a cross-site scripting (XSS) vulnerability in the html5lib serializer, affecting versions prior to 0.99999999. This flaw allows remote attackers to inject malicious scripts by exploiting mishandling of special characters within HTML attribute values. Rated as Medium severity (CVSS 6.1), it requires user interaction and could lead to low impact on confidentiality and integrity. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
<= 0.99999999CPE matchmatch criteria
cpe:2.3:a:html5lib:html5lib:*:1.0b8:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.1MEDIUM

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.16%
Probability of exploitation in next 30 days
EPSS Percentile
80.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0216 is in the 90th percentile among its peer group of 26,219 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
pippatch availablevia ghsa
Product: html5libFixed in: 0.99999999

Vendor Advisories (1)

pipGHSA-8f6m-gfq9-g33vmedium

Cross-site Scripting in html5lib

May 17, 2022

References

github.com / html5lib/html5lib-python/commit/9b8d8eb5afbc066b7fac9390f5ec75e5e8a7cab7
Patch
github.com / html5lib/html5lib-python/issues/11
Vendor Advisory
github.com / html5lib/html5lib-python/issues/12
Vendor Advisory
html5lib.readthedocs.io / en/latest/changes.html
Release Notes
openwall.com / lists/oss-security/2016/12/06/5
Mailing ListPatchThird Party Advisory
openwall.com / lists/oss-security/2016/12/08/8
Mailing ListPatchThird Party Advisory
securityfocus.com / bid/95132
Third Party AdvisoryVDB Entry