CVE-2015-4139: Cross-site scripting (XSS) vulnerability in smilies4wp.php in the WP Smiley plugin 1.4.1 for WordPress allows

Routine

LOW 3.5DOWNGRADE

CVE-2015-4139 is a low-severity flaw (CVSS 3.5) affecting wp smiley. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site scripting (XSS) vulnerability in smilies4wp.php in the WP Smiley plugin 1.4.1 for WordPress allows remote authenticated users to inject arbitrary web script or HTML via the s4w-more parameter to wp-admin/options-general.php.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	3.5 (Low)
EPSS exploit chance	1.6% (top 25%)
CISA exploited list	No
Weakness	CWE-79
Published	2015-06-18
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: wp smiley project

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

Am I affected?

Timeline

2015-06-18 18:59 UTCPublished CVE record published
2026-06-17 00:26 UTCUpdated Record last modified

wp smiley project wp smiley DOWNGRADE

Affected: 1.4.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.4.1

1. Check installed version

apt-cache policy wp-smiley || rpm -q wp-smiley || wp-smiley --version

2. No fixed release: DOWNGRADE to a release before 1.4.1 (Debian / Ubuntu)

apt-cache madison wp-smiley sudo apt install wp-smiley=<VERSION_BEFORE_1.4.1> sudo apt-mark hold wp-smiley

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

dnf --showduplicates list wp-smiley sudo dnf downgrade wp-smiley-<VERSION_BEFORE_1.4.1> sudo dnf versionlock add wp-smiley

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-2015-4139?

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

Is CVE-2015-4139 being exploited?

CVE-2015-4139 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-2015-4139 affect?

CVE-2015-4139 affects wp smiley. Severity is low (CVSS 3.5). Cross-site scripting (XSS) vulnerability in smilies4wp.php in the WP Smiley plugin 1.4.1 for WordPress allows remote authenticated users to inject arbitrary web script or HTML via the s4w-more parameter to wp-admin/options-general.php.

How urgent is CVE-2015-4139?

Priority 36/100. Public exploit reference

Software pages

WordPress vulnerabilities · PHP vulnerabilities

Related CVEs

CVE-2015-4140 MEDIUM 6.8 DOWNGRADE Cross-site request forgery (CSRF) vulnerability in the WP Smiley plugin 1.4.1 for WordPress allows remote atta

References

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