CVE-2019-19133: The CSS Hero plugin through 4.0.3 for WordPress is prone to reflected XSS via the URI in a csshero_action=edit

This month

MEDIUM 6.1DOWNGRADE

CVE-2019-19133 is a medium-severity flaw (CVSS 6.1) affecting csshero. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The CSS Hero plugin through 4.0.3 for WordPress is prone to reflected XSS via the URI in a csshero_action=edit_page request because it fails to sufficiently sanitize user-supplied input. An attacker may leverage this issue to execute arbitrary JavaScript in the browser of an unsuspecting user in the context of the affected site. This may allow the attacker to steal cookies or launch other attacks.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.9% (top 21%)
CISA exploited list	No
Weakness	CWE-79
Published	2019-12-04
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: csshero

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-12-04 19:15 UTCPublished CVE record published
2026-06-17 02:26 UTCUpdated Record last modified

csshero csshero DOWNGRADE

Affected: 4.0.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.0.3

1. Check installed version

apt-cache policy csshero || rpm -q csshero || csshero --version

2. No fixed release: DOWNGRADE to a release before 4.0.3 (Debian / Ubuntu)

apt-cache madison csshero sudo apt install csshero=<VERSION_BEFORE_4.0.3> sudo apt-mark hold csshero

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list csshero sudo dnf downgrade csshero-<VERSION_BEFORE_4.0.3> sudo dnf versionlock add csshero

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2019-19133?

csshero: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-19133 being exploited?

CVE-2019-19133 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2019-19133 affect?

CVE-2019-19133 affects csshero. Severity is medium (CVSS 6.1). The CSS Hero plugin through 4.0.3 for WordPress is prone to reflected XSS via the URI in a csshero_action=edit_page request because it fails to sufficiently sanitize user-supplied input. An attacker may leverage this issue to execute arbitr

How urgent is CVE-2019-19133?

Priority 46/100. Public exploit reference

Software pages

WordPress vulnerabilities

References

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