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CVE-2020-27783

MEDIUM
6.1
CVSS Score
Published: December 3, 2020 at 04:39 PM UTC
Updated: June 17, 2026 at 03:09 AM UTC
8 products affected across 6 vendorsDebian LinuxFedoraEnterprise Linux

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Severity
MEDIUM6.1
Exploit prediction
EPSS 4%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Debian Linux· Debiandrupal
95%
10.09.0
Fedora· Fedora Projectrpm
95%
3233
Lxml· Lxml
95%
1.2 ≤ v < 4.6.24.6.2
Affected range stops below 4.6.2, so it looks safe — our inference, not a vendor statement
SnapCenter· NetAppdrupal
95%
All versions
Communications Offline Mediation Controller· Oracle
95%
12.0.0.3.0
Zfs Storage Appliance Kit· Oracle
95%
8.8
Enterprise Linux· Red Hatrpm
95%
8.0
Software Collections· Red Hatrpm
95%
All versions

References (8)

x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://advisory.checkmarx.net/advisory/CX-2020-4286
x_refsource_MISCExploitIssue TrackingPatchThird Party Advisory
Source: [email protected]
https://bugzilla.redhat.com/show_bug.cgi?id=1901633
Mailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2020/12/msg00028.html
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JKG67GPGTV23KADT4D4GK4RMHSO4CIQL/
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TMHVKRUT22LVWNL3TB7HPSDHJT74Q3JK/
x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://security.netapp.com/advisory/ntap-20210521-0003/
Vendor Advisoryx_refsource_DEBIANThird Party Advisory
Source: [email protected]
https://www.debian.org/security/2020/dsa-4810
x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://www.oracle.com//security-alerts/cpujul2021.html

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.1MEDIUMCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-79

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