CVE-2021-29272: XSS
First published: Sat Mar 27 2021(Updated: )
bluemonday before 1.0.5 allows XSS because certain Go lowercasing converts an uppercase Cyrillic character, defeating a protection mechanism against the "script" string.
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Microco Bluemonday | <1.0.5 | |
| go/github.com/microcosm-cc/bluemonday | <1.0.5 | 1.0.5 |
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Reference Links
- https://github.com/microcosm-cc/bluemonday/releases/tag/v1.0.5
- https://vuln.ryotak.me/advisories/4
- https://nvd.nist.gov/vuln/detail/CVE-2021-29272
- https://github.com/microcosm-cc/bluemonday/issues/111
- https://github.com/microcosm-cc/bluemonday/commit/524f142fe46e945b7dcd291d7805c4b7dcf75bee
- https://vuln.ryotak.me/advisories/4.txt
- https://pkg.go.dev/vuln/GO-2022-0762
- https://github.com/advisories/GHSA-3x58-xr87-2fcj (Advisory)
Frequently Asked Questions
What is CVE-2021-29272?
CVE-2021-29272 is a vulnerability in the bluemonday package before version 1.0.5 that allows cross-site scripting (XSS) attacks.
What is the severity of CVE-2021-29272?
The severity of CVE-2021-29272 is medium with a CVSS score of 6.1.
How does CVE-2021-29272 work?
CVE-2021-29272 occurs because certain Go lowercasing converts an uppercase Cyrillic character, which defeats a protection mechanism against the "script" string, allowing for XSS attacks.
Which software versions are affected by CVE-2021-29272?
The bluemonday package versions up to and excluding 1.0.5 are affected by CVE-2021-29272.
How can I fix CVE-2021-29272?
To fix CVE-2021-29272, upgrade to bluemonday version 1.0.5 or newer.
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- canonical/microco bluemonday
- package-manager/go