CVE-2018-7753: Mozilla Bleach

Critical severity, CVSS 9.8. EPSS: 2.2% chance of exploitation in the next 30 days.

An issue was discovered in Bleach 2.1.x before 2.1.3. Attributes that have URI values weren't properly sanitized if the values contained character entities. Using character entities, it was possible to construct a URI value with a scheme that was not allowed that would slide through unsanitized.

Affected products

• Mozilla Bleach: version 2.1 only; version 2.1.1 only; version 2.1.2 only

Published 2018-03-07. Last modified 2026-06-17.