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6.1
MEDIUM CVSS 3.0
CVE-2016-9909
Html5lib Cross-Site Scripting (XSS) Vulnerability
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.

INFO

Published Date :

Feb. 22, 2017, 4:59 p.m.

Last Modified :

April 20, 2025, 1:37 a.m.

Remotely Exploit :

Yes !

Source :

[email protected]
Affected Products

The following products are affected by CVE-2016-9909 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Html5lib html5lib
: Total Affected Vendor : 1 | Products : 1
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 2.0 MEDIUM [email protected]
CVSS 3.0 MEDIUM [email protected]
Solution
Update html5lib to a version that resolves the cross-site scripting vulnerability.
  • Update html5lib to a non-vulnerable version.
Public PoC/Exploit Available at Github

CVE-2016-9909 has a 3 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2016-9909.

URL Resource
http://www.openwall.com/lists/oss-security/2016/12/06/5 Mailing List Patch Third Party Advisory
http://www.openwall.com/lists/oss-security/2016/12/08/8 Mailing List Patch Third Party Advisory
http://www.securityfocus.com/bid/95132 Third Party Advisory VDB Entry
https://github.com/html5lib/html5lib-python/commit/9b8d8eb5afbc066b7fac9390f5ec75e5e8a7cab7 Patch
https://github.com/html5lib/html5lib-python/issues/11 Vendor Advisory
https://github.com/html5lib/html5lib-python/issues/12 Vendor Advisory
https://html5lib.readthedocs.io/en/latest/changes.html#b9 Release Notes
http://www.openwall.com/lists/oss-security/2016/12/06/5 Mailing List Patch Third Party Advisory
http://www.openwall.com/lists/oss-security/2016/12/08/8 Mailing List Patch Third Party Advisory
http://www.securityfocus.com/bid/95132 Third Party Advisory VDB Entry
https://github.com/html5lib/html5lib-python/commit/9b8d8eb5afbc066b7fac9390f5ec75e5e8a7cab7 Patch
https://github.com/html5lib/html5lib-python/issues/11 Vendor Advisory
https://github.com/html5lib/html5lib-python/issues/12 Vendor Advisory
https://html5lib.readthedocs.io/en/latest/changes.html#b9 Release Notes
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2016-9909 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2016-9909 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

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Updated: 2 years, 3 months ago
1 stars 0 fork 0 watcher
Born at : Aug. 23, 2022, 2:25 p.m. This repo has been linked 2 different CVEs too.
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Get all cve corresponding to a specific keyword or a list of keywords from the mitre database (https://cve.mitre.org/)

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Python Dockerfile Makefile

Updated: 8 months, 3 weeks ago
16 stars 7 fork 7 watcher
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cclauss/pythonista-module-versions

Compare the version numbers of extra modules in Pythonista with PyPI

Python

Updated: 2 weeks ago
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Born at : Jan. 4, 2015, 9:41 a.m. This repo has been linked 2 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2016-9909 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2016-9909 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference http://www.openwall.com/lists/oss-security/2016/12/06/5
    Added Reference http://www.openwall.com/lists/oss-security/2016/12/08/8
    Added Reference http://www.securityfocus.com/bid/95132
    Added Reference https://github.com/html5lib/html5lib-python/commit/9b8d8eb5afbc066b7fac9390f5ec75e5e8a7cab7
    Added Reference https://github.com/html5lib/html5lib-python/issues/11
    Added Reference https://github.com/html5lib/html5lib-python/issues/12
    Added Reference https://html5lib.readthedocs.io/en/latest/changes.html#b9
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Initial Analysis by [email protected]

    Feb. 23, 2017

    Action Type Old Value New Value
    Added CVSS V2 (AV:N/AC:M/Au:N/C:N/I:P/A:N)
    Added CVSS V3 AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    Changed Reference Type http://www.openwall.com/lists/oss-security/2016/12/08/8 No Types Assigned http://www.openwall.com/lists/oss-security/2016/12/08/8 Third Party Advisory, Mailing List, Patch
    Changed Reference Type https://github.com/html5lib/html5lib-python/issues/12 No Types Assigned https://github.com/html5lib/html5lib-python/issues/12 Vendor Advisory
    Changed Reference Type https://github.com/html5lib/html5lib-python/commit/9b8d8eb5afbc066b7fac9390f5ec75e5e8a7cab7 No Types Assigned https://github.com/html5lib/html5lib-python/commit/9b8d8eb5afbc066b7fac9390f5ec75e5e8a7cab7 Patch
    Changed Reference Type https://github.com/html5lib/html5lib-python/issues/11 No Types Assigned https://github.com/html5lib/html5lib-python/issues/11 Vendor Advisory
    Changed Reference Type https://html5lib.readthedocs.io/en/latest/changes.html#b9 No Types Assigned https://html5lib.readthedocs.io/en/latest/changes.html#b9 Release Notes
    Changed Reference Type http://www.openwall.com/lists/oss-security/2016/12/06/5 No Types Assigned http://www.openwall.com/lists/oss-security/2016/12/06/5 Third Party Advisory, Mailing List, Patch
    Changed Reference Type http://www.securityfocus.com/bid/95132 No Types Assigned http://www.securityfocus.com/bid/95132 Third Party Advisory, VDB Entry
    Added CWE CWE-79
    Added CPE Configuration OR *cpe:2.3:a:html5lib:html5lib:0.99999999:1.0b8:*:*:*:*:*:* (and previous)
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 6.1
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact
Base CVSS Score: 4.3
Access Vector
Access Complexity
Authentication
Confidentiality Impact
Integrity Impact
Availability Impact
Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.49 }} -0.09%

score

0.64693

percentile