CVE-2021-42576
CRITICALCVSS 9.8/10EPSS 1.51%
Last modified
CVE-2021-42576 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. The bluemonday sanitizer before 1.0.16 for Go, and before 0.0.8 for Python (in pybluemonday), does not properly enforce policies associated with the SELECT, STYLE, and OPTION elements.. EPSS estimates a 1.51% chance of exploitation in the next 30 days.
Description
The bluemonday sanitizer before 1.0.16 for Go, and before 0.0.8 for Python (in pybluemonday), does not properly enforce policies associated with the SELECT, STYLE, and OPTION elements.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Microco | Bluemonday | < 1.0.16 |
| Python | Pybluemonday | < 0.0.8 |
References
- https://docs.google.com/document/d/11SoX296sMS0XoQiQbpxc5pNxSdbJKDJkm5BDv0zrX50/Exploit, Third Party Advisory
- https://docs.google.com/document/d/11SoX296sMS0XoQiQbpxc5pNxSdbJKDJkm5BDv0zrX50/Exploit, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-42576?
The bluemonday sanitizer before 1.0.16 for Go, and before 0.0.8 for Python (in pybluemonday), does not properly enforce policies associated with the SELECT, STYLE, and OPTION elements.
How severe is CVE-2021-42576?
CVE-2021-42576 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.51% probability of exploitation in the next 30 days.
How do I fix CVE-2021-42576?
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.
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Are you affected by CVE-2021-42576?
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Scan your code nowSource: NVD / NIST