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CVE-2020-4046

Authenticated XSS through embed block in WordPress

MEDIUM
5.4
CVSS Score
Published: June 12, 2020 at 03:55 PM UTC
Updated: June 17, 2026 at 03:19 AM UTC
3 products affected across 3 vendorsDebian LinuxFedoraWordPress

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Severity
MEDIUM5.4
Exploit prediction
EPSS 2%

Description

In affected versions of WordPress, users with low privileges (like contributors and authors) can use the embed block in a certain way to inject unfiltered HTML in the block editor. When affected posts are viewed by a higher privileged user, this could lead to script execution in the editor/wp-admin. This has been patched in version 5.4.2, along with all the previously affected versions via a minor release (5.3.4, 5.2.7, 5.1.6, 5.0.10, 4.9.15, 4.8.14, 4.7.18, 4.6.19, 4.5.22, 4.4.23, 4.3.24, 4.2.28, 4.1.31, 4.0.31, 3.9.32, 3.8.34, 3.7.34).

Affected

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

Debian Linux· Debiandrupal
95%
8.09.0
Fedora· Fedora Projectrpm
95%
3132
WordPress· WordPressdrupal
95%
v < 3.7.34v < 3.8.34v < 3.9.32v < 4.0.31v < 4.1.31v < 4.2.28v < 4.3.24v < 4.4.23v < 4.5.22v < 4.6.19v < 4.7.18v < 4.8.14v < 4.9.15v < 5.0.10v < 5.1.6v < 5.2.7v < 5.3.4v < 5.4.23.7 ≤ v < 3.7.343.8 ≤ v < 3.8.343.9 ≤ v < 3.9.324.0 ≤ v < 4.0.314.1 ≤ v < 4.1.314.2 ≤ v < 4.2.284.3 ≤ v < 4.3.244.4 ≤ v < 4.4.234.5 ≤ v < 4.5.224.6 ≤ v < 4.6.194.7 ≤ v < 4.7.184.8 ≤ v < 4.8.144.9 ≤ v < 4.9.155.0 ≤ v < 5.0.105.1 ≤ v < 5.1.65.2 ≤ v < 5.2.75.3.0 ≤ v < 5.3.45.4 ≤ v < 5.4.2
Affected range stops below 3.7.34, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.8.34, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.9.32, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.0.31, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.1.31, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.2.28, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.3.24, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.4.23, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.5.22, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.6.19, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.7.18, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.8.14, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.9.15, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.0.10, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.1.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.2.7, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.3.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.4.2, so it looks safe — our inference, not a vendor statement

References (6)

x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://github.com/WordPress/wordpress-develop/security/advisories/GHSA-rpwf-hrh2-39jf
Mailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2020/07/msg00000.html
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/773N2ZV7QEMBGKH6FBKI6Q5S3YJMW357/
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ODNHXVJS25YVWYQHOCICXTLIN5UYJFDN/
x_refsource_MISCVendor Advisory
Source: [email protected]
https://wordpress.org/news/2020/06/wordpress-5-4-2-security-and-maintenance-release/
Vendor Advisoryx_refsource_DEBIANThird Party Advisory
Source: [email protected]
https://www.debian.org/security/2020/dsa-4709

CVSS

5.4MEDIUMGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-80CWE-79

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