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CVE-2019-16781

Stored cross-site scripting (XSS) in WordPress block editor

MEDIUM
5.4
CVSS Score
Published: December 26, 2019 at 05:00 PM UTC
Updated: June 17, 2026 at 02:22 AM UTC
2 products affected across 2 vendorsDebian LinuxWordPress

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Severity
MEDIUM5.4
Exploit prediction
EPSS 2%

Description

In WordPress before 5.3.1, authenticated users with lower privileges (like contributors) can inject JavaScript code in the block editor, which is executed within the dashboard. It can lead to an admin opening the affected post in the editor leading to XSS.

Affected

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

Debian Linux· Debiandrupal
95%
10.09.0
WordPress· WordPressdrupal
95%
v < 5.3.1< 5.3.1 ≤ v < 5.3.1< 5.3.1
Affected range stops below 5.3.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (7)

x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://github.com/WordPress/wordpress-develop/security/advisories/GHSA-pg4x-64rh-3c9v
x_refsource_MISCPermissions RequiredThird Party Advisory
Source: [email protected]
https://hackerone.com/reports/731301
Mailing Listx_refsource_BUGTRAQThird Party Advisory
Source: [email protected]
https://seclists.org/bugtraq/2020/Jan/8
x_refsource_MISCRelease NotesThird Party Advisory
Source: [email protected]
https://wordpress.org/news/2019/12/wordpress-5-3-1-security-and-maintenance-release/
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://wpvulndb.com/vulnerabilities/9976
Vendor Advisoryx_refsource_DEBIANThird Party Advisory
Source: [email protected]
https://www.debian.org/security/2020/dsa-4599
Vendor Advisoryx_refsource_DEBIANThird Party Advisory
Source: [email protected]
https://www.debian.org/security/2020/dsa-4677

CVSS

5.4MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-79

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