CVE catalog
CVE-2020-27783
lxml: CVE-2020-27783
- Severity
- Medium · CVSS 6.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 3.98% · Oct 25, 2026
A XSS vulnerability was discovered in python-lxml's clean module. The module's parser didn't properly imitate browsers, which caused different behaviors between the sanitizer and the user's page. A remote attacker could exploit this flaw to run arbitrary HTML/JS code.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | lxml | sid | 6.1.3-1.1 | fixed |
| Debian | lxml | forky | 6.1.3-1 | fixed |
| Debian | lxml | trixie | 5.4.0-1 | fixed |
| Debian | lxml | bookworm | 4.9.2-1 | fixed |
| Debian | lxml | bookworm-security | 4.9.2-1+deb12u1 | fixed |
| Alpine | py3-lxml | 3.16 | 4.6.2-r0 | fixed |
| Alpine | py3-lxml | 3.17 | 4.6.2-r0 | fixed |
| Alpine | py3-lxml | 3.18 | 4.6.2-r0 | fixed |
| Alpine | py3-lxml | 3.19 | 4.6.2-r0 | fixed |
| Alpine | py3-lxml | 3.20 | 4.6.2-r0 | fixed |
| Alpine | py3-lxml | 3.21 | 4.6.2-r0 | fixed |
| Alpine | py3-lxml | 3.22 | 4.6.2-r0 | fixed |
| Alpine | py3-lxml | 3.23 | 4.6.2-r0 | fixed |
| Alpine | py3-lxml | 3.24 | 4.6.2-r0 | fixed |
| Ubuntu | lxml | pro | 3.2.0-1 | vulnerable |
| Ubuntu | lxml | pro | 3.3.0~beta2-1 | vulnerable |
| Ubuntu | lxml | pro | 3.3.0~beta4-1 | vulnerable |
| Ubuntu | lxml | pro | 3.3.1-1 | vulnerable |
| Ubuntu | lxml | pro | 3.3.2-1 | vulnerable |
| Ubuntu | lxml | pro | 3.3.2-1build1 | vulnerable |
| Ubuntu | lxml | pro | 3.3.3-1 | vulnerable |
| Ubuntu | lxml | pro | 3.3.3-1ubuntu0.1 | vulnerable |
| Ubuntu | lxml | pro | 3.3.3-1ubuntu0.2 | vulnerable |
| Ubuntu | lxml | pro | 3.3.3-1ubuntu0.2+esm1 | vulnerable |
| Ubuntu | lxml | pro | 3.3.3-1ubuntu0.2+esm2 | fixed |
| Ubuntu | lxml | 16.04 | 3.4.4-1 | vulnerable |
| Ubuntu | lxml | 16.04 | 3.5.0-1 | vulnerable |
| Ubuntu | lxml | 16.04 | 3.5.0-1build1 | vulnerable |
| Ubuntu | lxml | 16.04 | 3.5.0-1ubuntu0.1 | vulnerable |
| Ubuntu | lxml | 16.04 | 3.5.0-1ubuntu0.2 | vulnerable |
| Ubuntu | lxml | 16.04 | 3.5.0-1ubuntu0.3 | fixed |
| Ubuntu | lxml | 18.04 | 4.0.0-1 | vulnerable |
| Ubuntu | lxml | 18.04 | 4.1.0-1 | vulnerable |
| Ubuntu | lxml | 18.04 | 4.2.0-1 | vulnerable |
| Ubuntu | lxml | 18.04 | 4.2.1-1 | vulnerable |
| Ubuntu | lxml | 18.04 | 4.2.1-1ubuntu0.1 | vulnerable |
| Ubuntu | lxml | 18.04 | 4.2.1-1ubuntu0.2 | vulnerable |
| Ubuntu | lxml | 18.04 | 4.2.1-1ubuntu0.3 | fixed |
| Ubuntu | lxml | 20.04 | 4.4.1-1 | vulnerable |
| Ubuntu | lxml | 20.04 | 4.4.1-1build1 | vulnerable |
| Ubuntu | lxml | 20.04 | 4.4.2-1 | vulnerable |
| Ubuntu | lxml | 20.04 | 4.5.0-1 | vulnerable |
| Ubuntu | lxml | 20.04 | 4.5.0-1ubuntu0.1 | vulnerable |
| Ubuntu | lxml | 20.04 | 4.5.0-1ubuntu0.2 | fixed |
| Ubuntu | lxml | pro | 3.2.0-1 | vulnerable |
| Ubuntu | lxml | pro | 3.3.0~beta2-1 | vulnerable |
| Ubuntu | lxml | pro | 3.3.0~beta4-1 | vulnerable |
| Ubuntu | lxml | pro | 3.3.1-1 | vulnerable |
| Ubuntu | lxml | pro | 3.3.2-1 | vulnerable |
| Ubuntu | lxml | pro | 3.3.2-1build1 | vulnerable |
| Ubuntu | lxml | pro | 3.3.3-1 | vulnerable |
| Ubuntu | lxml | pro | 3.3.3-1ubuntu0.1 | vulnerable |
| Ubuntu | lxml | pro | 3.3.3-1ubuntu0.2 | vulnerable |
| Ubuntu | lxml | pro | 3.3.3-1ubuntu0.2+esm1 | fixed |
| Ubuntu | lxml | 16.04 | 3.4.4-1 | vulnerable |
| Ubuntu | lxml | 16.04 | 3.5.0-1 | vulnerable |
| Ubuntu | lxml | 16.04 | 3.5.0-1build1 | vulnerable |
| Ubuntu | lxml | 16.04 | 3.5.0-1ubuntu0.1 | vulnerable |
| Ubuntu | lxml | 16.04 | 3.5.0-1ubuntu0.2 | fixed |
| Ubuntu | lxml | 18.04 | 4.0.0-1 | vulnerable |
| Ubuntu | lxml | 18.04 | 4.1.0-1 | vulnerable |
| Ubuntu | lxml | 18.04 | 4.2.0-1 | vulnerable |
| Ubuntu | lxml | 18.04 | 4.2.1-1 | vulnerable |
| Ubuntu | lxml | 18.04 | 4.2.1-1ubuntu0.1 | vulnerable |
| Ubuntu | lxml | 18.04 | 4.2.1-1ubuntu0.2 | fixed |
| Ubuntu | lxml | 20.04 | 4.4.1-1 | vulnerable |
| Ubuntu | lxml | 20.04 | 4.4.1-1build1 | vulnerable |
| Ubuntu | lxml | 20.04 | 4.4.2-1 | vulnerable |
| Ubuntu | lxml | 20.04 | 4.5.0-1 | vulnerable |
| Ubuntu | lxml | 20.04 | 4.5.0-1ubuntu0.1 | fixed |
| Ubuntu | lxml | pro | 3.2.0-1 | vulnerable |
| Ubuntu | lxml | pro | 3.3.0~beta2-1 | vulnerable |
| Ubuntu | lxml | pro | 3.3.0~beta4-1 | vulnerable |
| Ubuntu | lxml | pro | 3.3.1-1 | vulnerable |
| Ubuntu | lxml | pro | 3.3.2-1 | vulnerable |
| Ubuntu | lxml | pro | 3.3.2-1build1 | vulnerable |
| Ubuntu | lxml | pro | 3.3.3-1 | vulnerable |
| Ubuntu | lxml | pro | 3.3.3-1ubuntu0.1 | vulnerable |
| Ubuntu | lxml | pro | 3.3.3-1ubuntu0.2 | vulnerable |
| Ubuntu | lxml | pro | 3.3.3-1ubuntu0.2+esm1 | vulnerable |
| Ubuntu | lxml | pro | 3.3.3-1ubuntu0.2+esm2 | fixed |
| Ubuntu | lxml | 16.04 | 3.4.4-1 | vulnerable |
| Ubuntu | lxml | 16.04 | 3.5.0-1 | vulnerable |
| Ubuntu | lxml | 16.04 | 3.5.0-1build1 | vulnerable |
| Ubuntu | lxml | 16.04 | 3.5.0-1ubuntu0.1 | vulnerable |
| Ubuntu | lxml | 16.04 | 3.5.0-1ubuntu0.2 | vulnerable |
| Ubuntu | lxml | 16.04 | 3.5.0-1ubuntu0.3 | fixed |
| Ubuntu | lxml | 18.04 | 4.0.0-1 | vulnerable |
| Ubuntu | lxml | 18.04 | 4.1.0-1 | vulnerable |
| Ubuntu | lxml | 18.04 | 4.2.0-1 | vulnerable |
| Ubuntu | lxml | 18.04 | 4.2.1-1 | vulnerable |
| Ubuntu | lxml | 18.04 | 4.2.1-1ubuntu0.1 | vulnerable |
| Ubuntu | lxml | 18.04 | 4.2.1-1ubuntu0.2 | vulnerable |
| Ubuntu | lxml | 18.04 | 4.2.1-1ubuntu0.3 | fixed |
| Ubuntu | lxml | 20.04 | 4.4.1-1 | vulnerable |
| Ubuntu | lxml | 20.04 | 4.4.1-1build1 | vulnerable |
| Ubuntu | lxml | 20.04 | 4.4.2-1 | vulnerable |
| Ubuntu | lxml | 20.04 | 4.5.0-1 | vulnerable |
| Ubuntu | lxml | 20.04 | 4.5.0-1ubuntu0.1 | vulnerable |
| Ubuntu | lxml | 20.04 | 4.5.0-1ubuntu0.2 | fixed |
| Suse | python3-lxml | linux enterprise module for public cloud 12 | 3.3.5-3.12.1 | fixed |
| Suse | python3-lxml | linux enterprise server 12 sp5 | 3.6.1-3.3.1 | fixed |
| Suse | python3-lxml | linux enterprise server for sap applications 12 sp5 | 3.6.1-3.3.1 | fixed |
| Opensuse | python-lxml | leap 15.3 | 4.0.0-150000.4.3.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | lxml | source | sid | 4.6.2-1 | not yet assigned | Not reported | Not reported |
| Debian | lxml | source | forky | 4.6.2-1 | not yet assigned | Not reported | Not reported |
| Debian | lxml | source | trixie | 4.6.2-1 | not yet assigned | Not reported | Not reported |
| Debian | lxml | source | bookworm | 4.6.2-1 | not yet assigned | Not reported | Not reported |
| Alpine | py3-lxml | apk | 3.16 | 4.6.2-r0 | Not reported | ALPINE-CVE-2020-27783 | Not reported |
| Alpine | py3-lxml | apk | 3.17 | 4.6.2-r0 | Not reported | ALPINE-CVE-2020-27783 | Not reported |
| Alpine | py3-lxml | apk | 3.18 | 4.6.2-r0 | Not reported | ALPINE-CVE-2020-27783 | Not reported |
| Alpine | py3-lxml | apk | 3.19 | 4.6.2-r0 | Not reported | ALPINE-CVE-2020-27783 | Not reported |
| Alpine | py3-lxml | apk | 3.20 | 4.6.2-r0 | Not reported | ALPINE-CVE-2020-27783 | Not reported |
| Alpine | py3-lxml | apk | 3.21 | 4.6.2-r0 | Not reported | ALPINE-CVE-2020-27783 | Not reported |
| Alpine | py3-lxml | apk | 3.22 | 4.6.2-r0 | Not reported | ALPINE-CVE-2020-27783 | Not reported |
| Alpine | py3-lxml | apk | 3.23 | 4.6.2-r0 | Not reported | ALPINE-CVE-2020-27783 | Not reported |
| Alpine | py3-lxml | apk | 3.24 | 4.6.2-r0 | Not reported | ALPINE-CVE-2020-27783 | Not reported |
| Ubuntu | lxml | deb | pro | 3.3.3-1ubuntu0.2+esm2 | Not reported | USN-4666-2 | Not reported |
| Ubuntu | lxml | deb | 16.04 | 3.5.0-1ubuntu0.3 | Not reported | USN-4666-2 | Not reported |
| Ubuntu | lxml | deb | 18.04 | 4.2.1-1ubuntu0.3 | Not reported | USN-4666-2 | Not reported |
| Ubuntu | lxml | deb | 20.04 | 4.5.0-1ubuntu0.2 | Not reported | USN-4666-2 | Not reported |
| Ubuntu | lxml | deb | pro | 3.3.3-1ubuntu0.2+esm1 | Not reported | USN-4666-1 | Not reported |
| Ubuntu | lxml | deb | 16.04 | 3.5.0-1ubuntu0.2 | Not reported | USN-4666-1 | Not reported |
| Ubuntu | lxml | deb | 18.04 | 4.2.1-1ubuntu0.2 | Not reported | USN-4666-1 | Not reported |
| Ubuntu | lxml | deb | 20.04 | 4.5.0-1ubuntu0.1 | Not reported | USN-4666-1 | Not reported |
| Ubuntu | lxml | deb | pro | 3.3.3-1ubuntu0.2+esm2 | Not reported | UBUNTU-CVE-2020-27783 | Not reported |
| Ubuntu | lxml | deb | 16.04 | 3.5.0-1ubuntu0.3 | Not reported | UBUNTU-CVE-2020-27783 | Not reported |
| Ubuntu | lxml | deb | 18.04 | 4.2.1-1ubuntu0.3 | Not reported | UBUNTU-CVE-2020-27783 | Not reported |
| Ubuntu | lxml | deb | 20.04 | 4.5.0-1ubuntu0.2 | Not reported | UBUNTU-CVE-2020-27783 | Not reported |
| Suse | python3-lxml | rpm | linux enterprise module for public cloud 12 | 3.3.5-3.12.1 | Not reported | SUSE-SU-2022:3460-1 | Not reported |
| Suse | python3-lxml | rpm | linux enterprise server 12 sp5 | 3.6.1-3.3.1 | Not reported | SUSE-SU-2022:3461-1 | Not reported |
| Suse | python3-lxml | rpm | linux enterprise server for sap applications 12 sp5 | 3.6.1-3.3.1 | Not reported | SUSE-SU-2022:3461-1 | Not reported |
| Opensuse | python-lxml | rpm | leap 15.3 | 4.0.0-150000.4.3.1 | Not reported | SUSE-SU-2022:3836-1 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [python3-lxml]Fixed
Source package: [lxml]
Details (2)
4.9.2-1+b1· amd64 · bookwormFixed · Fixed:
4.6.2-1dsa · lxml · debian · bookworm; dsa · lxml · debian · 12
4.9.2-1+b1· arm64 · bookwormFixed · Fixed:
4.6.2-1dsa · lxml · debian · bookworm; dsa · lxml · debian · 12
- [python-lxml-doc]Fixed
Source package: [lxml]
Details (2)
4.9.2-1· all · bookwormFixed · Fixed:
4.6.2-1dsa · lxml · debian · bookworm; dsa · lxml · debian · 12
4.9.2-1· all · bookwormFixed · Fixed:
4.6.2-1dsa · lxml · debian · bookworm; dsa · lxml · debian · 12
[Debian 13 (Trixie)]
- [python3-lxml]Fixed
Source package: [lxml]
Details (2)
5.4.0-1· amd64 · trixieFixed · Fixed:
4.6.2-1dsa · lxml · debian · 13
5.4.0-1· arm64 · trixieFixed · Fixed:
4.6.2-1dsa · lxml · debian · 13
- [python-lxml-doc]Fixed
Source package: [lxml]
Details (2)
5.4.0-1· all · trixieFixed · Fixed:
4.6.2-1dsa · lxml · debian · 13
5.4.0-1· all · trixieFixed · Fixed:
4.6.2-1dsa · lxml · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/rhsa-2021_1761.json]
- [https://osv.dev/vulnerability/ALPINE-CVE-2020-27783]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2020-27783]
- [https://osv.dev/vulnerability/DSA-4810-1]
- [https://osv.dev/vulnerability/SUSE-SU-2022:3460-1]
- [https://osv.dev/vulnerability/SUSE-SU-2022:3461-1]
- [https://osv.dev/vulnerability/SUSE-SU-2022:3836-1]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2020-27783]
- [https://osv.dev/vulnerability/USN-4666-1]
- [https://osv.dev/vulnerability/USN-4666-2]
- [https://security-tracker.debian.org/tracker/CVE-2020-27783]
- [https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-27783.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2021/wid-sec-w-2022-0931.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]