Vulnerability Details : CVE-2016-9909
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.
Vulnerability category: Cross site scripting (XSS)
Products affected by CVE-2016-9909
- cpe:2.3:a:html5lib:html5lib:*:1.0b8:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2016-9909
0.32%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 67 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2016-9909
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.3
|
MEDIUM | AV:N/AC:M/Au:N/C:N/I:P/A:N |
8.6
|
2.9
|
NIST | |
|
6.1
|
MEDIUM | CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
2.8
|
2.7
|
NIST |
CWE ids for CVE-2016-9909
-
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.Assigned by: nvd@nist.gov (Primary)
References for CVE-2016-9909
-
https://github.com/html5lib/html5lib-python/issues/12
Possible to make IE run script after roundtripping in html5lib · Issue #12 · html5lib/html5lib-python · GitHubVendor Advisory
-
https://github.com/html5lib/html5lib-python/commit/9b8d8eb5afbc066b7fac9390f5ec75e5e8a7cab7
Fix #11, #12: quote attributes that need escaping in legacy browsers · html5lib/html5lib-python@9b8d8eb · GitHubPatch
-
http://www.openwall.com/lists/oss-security/2016/12/06/5
oss-security - CVE Request: html5lib: potential cross-site scripting vulnerablity: quote attributes that need escaping in legacy browsersMailing List;Patch;Third Party Advisory
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https://github.com/html5lib/html5lib-python/issues/11
Quote attributes containing weird whitespace or '<' · Issue #11 · html5lib/html5lib-python · GitHubVendor Advisory
-
http://www.securityfocus.com/bid/95132
html5lib Multiple Cross Site Scripting VulnerabilitiesThird Party Advisory;VDB Entry
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https://html5lib.readthedocs.io/en/latest/changes.html#b9
Change Log — html5lib 1.1-dev documentationRelease Notes
-
http://www.openwall.com/lists/oss-security/2016/12/08/8
oss-security - Re: CVE Request: html5lib: potential cross-site scripting vulnerablity: quote attributes that need escaping in legacy browsersMailing List;Patch;Third Party Advisory
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