CVE-2023-5621: The Thumbnail Slider With Lightbox plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the I

Routine

MEDIUM 4.4DOWNGRADE

CVE-2023-5621 is a medium-severity flaw (CVSS 4.4) affecting thumbnail slider with lightbox. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Thumbnail Slider With Lightbox plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the Image Title field in versions up to, and including, 1.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level access, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installat

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	4.4 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	High
User interaction	None
EPSS exploit chance	0.5% (top 59%)
CISA exploited list	No
Weakness	CWE-79
Published	2023-10-18
Last modified	2026-06-17

Publisher (CNA): Wordfence · Vendor: i13websolution

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

Am I affected?

Timeline

2023-10-18 08:15 UTCPublished CVE record published
2026-06-17 06:48 UTCUpdated Record last modified

i13websolution thumbnail slider with lightbox DOWNGRADE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

apt-cache policy thumbnail-slider-with-lightbox || rpm -q thumbnail-slider-with-lightbox || thumbnail-slider-with-lightbox --version

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison thumbnail-slider-with-lightbox sudo apt install thumbnail-slider-with-lightbox=<VERSION_BEFORE_1.0> sudo apt-mark hold thumbnail-slider-with-lightbox

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

dnf --showduplicates list thumbnail-slider-with-lightbox sudo dnf downgrade thumbnail-slider-with-lightbox-<VERSION_BEFORE_1.0> sudo dnf versionlock add thumbnail-slider-with-lightbox

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-2023-5621?

thumbnail slider with lightbox: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-5621 being exploited?

CVE-2023-5621 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-2023-5621 affect?

CVE-2023-5621 affects thumbnail slider with lightbox. Severity is medium (CVSS 4.4). The Thumbnail Slider With Lightbox plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the Image Title field in versions up to, and including, 1.0 due to insufficient input sanitization and output escaping. This makes it p

How urgent is CVE-2023-5621?

Priority 26/100. No elevated risk signals yet.

Software pages

WordPress vulnerabilities

Related CVEs

CVE-2023-5820 CRITICAL 9.6 DOWNGRADE The Thumbnail Slider With Lightbox plugin for WordPress is vulnerable to Cross-Site Request Forgery in version
CVE-2023-5531 MEDIUM 4.3 UPGRADE The Thumbnail Slider With Lightbox plugin for WordPress is vulnerable to Cross-Site Request Forgery in version
CVE-2015-10146 MEDIUM 4.9 UPGRADE The Thumbnail Slider With Lightbox plugin for WordPress is vulnerable to SQL Injection via the 'id' parameter

References

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