PatchTheCVECVE-2021-29272: bluemonday before 1.0.5 allows XSS because certain Go lowercasing converts an uppercase Cyrillic character, de
CVE-2021-29272 is a medium-severity flaw (CVSS 6.1) affecting bluemonday. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
bluemonday before 1.0.5 allows XSS because certain Go lowercasing converts an uppercase Cyrillic character, defeating a protection mechanism against the "script" string.
Why this priority
- No elevated risk signals yet
A fixed release or distro patch exists.
Risk facts
| CVSS score | 6.1 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 0.9% (top 39%) |
| CISA exploited list | No |
| Weakness | CWE-79 |
| Published | 2021-03-27 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-29272?
bluemonday: upgrade to 1.0.5. Exact commands for each OS are on this page.
Is CVE-2021-29272 being exploited?
CVE-2021-29272 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-29272 affect?
CVE-2021-29272 affects bluemonday. Severity is medium (CVSS 6.1). bluemonday before 1.0.5 allows XSS because certain Go lowercasing converts an uppercase Cyrillic character, defeating a protection mechanism against the "script" string.
How urgent is CVE-2021-29272?
Priority 36/100. No elevated risk signals yet.
Related CVEs
- CVE-2021-42576 CRITICAL 9.8 UPGRADE UPGRADE The bluemonday sanitizer before 1.0.16 for Go, and before 0.0.8 for Python (in pybluemonday), does not properl