Bug 1944293 (CVE-2021-29272)

Summary:	CVE-2021-29272 bluemonday: Cross-site scripting via uppercase Cyrillic i
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
Component:	vulnerability	Assignee:	Nobody <nobody>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	eclipseo, go-sig, gparvin, jchaloup, jweiser, stcannon, thee
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	bluemonday 1.0.5	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1944656
Bug Blocks:	1944294

Description Pedro Sampaio 2021-03-29 17:25:05 UTC

bluemonday before 1.0.5 allows XSS because certain Go lowercasing converts an uppercase Cyrillic character, defeating a protection mechanism against the "script" string.

References:

https://github.com/microcosm-cc/bluemonday/releases/tag/v1.0.5
https://vuln.ryotak.me/advisories/4.txt