CVE-2018-7753
CRITICAL9.8EPSS 0.51%Bleach URI Scheme Restriction Bypass
Published: 1/4/2019Modified: 4/28/2026
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.
Affected packages (3)
- Debian/python-bleachfrom 0, < 2.1.3-1
- PyPI/bleach>= 2.1.0, < 2.1.3
- PyPI/bleachfrom 0, < c5df5789ec3471a31311f42c2d19fc2cf21b35ef | >= 2.1, < 2.1.3
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | CRITICAL9.8 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
References (8)
- ADVISORYhttps://github.com/advisories/GHSA-m9mq-p2f9-cfqv
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2018-7753
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2018-7753
- PATCHhttps://github.com/mozilla/bleach
- WEBhttps://bugs.debian.org/892252
- WEBhttps://github.com/mozilla/bleach/commit/c5df5789ec3471a31311f42c2d19fc2cf21b35ef
- WEBhttps://github.com/mozilla/bleach/releases/tag/v2.1.3
- WEBhttps://github.com/pypa/advisory-database/tree/main/vulns/bleach/PYSEC-2018-51.yaml