VulnerabilityModified
CVE-2018-7753
Using character entities, it was possible to construct a URI value with a scheme that was not allowed that would slide through unsanitized.
CRITICAL 9.8EPSS 2.15%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.15%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.0
- 9.8 CRITICALCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 2.15% probability · 81th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- mozilla/bleach
- Source
- cve@mitre.org
References
- https://bugs.debian.org/892252Third Party Advisory
- https://github.com/mozilla/bleach/commit/c5df5789ec3471a31311f42c2d19fc2cf21b35efPatch, Third Party Advisory
- https://github.com/mozilla/bleach/releases/tag/v2.1.3Third Party Advisory
- https://bugs.debian.org/892252Third Party Advisory
- https://github.com/mozilla/bleach/commit/c5df5789ec3471a31311f42c2d19fc2cf21b35efPatch, Third Party Advisory
- https://github.com/mozilla/bleach/releases/tag/v2.1.3Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.