CVE-2016-9909
UnknownEPSS 2.14%
Last modified
CVE-2016-9909 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 2.14% chance of exploitation in the next 30 days.
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.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Html5lib | Html5lib | <= 0.99999999 | 1.0b8 |
References
- http://www.openwall.com/lists/oss-security/2016/12/06/5Mailing List, Patch, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2016/12/08/8Mailing List, Patch, Third Party Advisory
- http://www.securityfocus.com/bid/95132Third Party Advisory, VDB Entry
- https://github.com/html5lib/html5lib-python/issues/11Vendor Advisory
- https://github.com/html5lib/html5lib-python/issues/12Vendor Advisory
- http://www.openwall.com/lists/oss-security/2016/12/06/5Mailing List, Patch, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2016/12/08/8Mailing List, Patch, Third Party Advisory
- http://www.securityfocus.com/bid/95132Third Party Advisory, VDB Entry
- https://github.com/html5lib/html5lib-python/issues/11Vendor Advisory
- https://github.com/html5lib/html5lib-python/issues/12Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is 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.
How severe is CVE-2016-9909?
Severity scoring for CVE-2016-9909 is pending analysis. The EPSS model estimates a 2.14% probability of exploitation in the next 30 days.
How do I fix CVE-2016-9909?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2016-9909?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST