CVE-2023-5820: The Thumbnail Slider With Lightbox plugin for WordPress is vulnerable to Cross-Site Request Forgery in version

This month

CRITICAL 9.6DOWNGRADE

CVE-2023-5820 is a critical-severity flaw (CVSS 9.6) 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 Cross-Site Request Forgery in version 1.0. This is due to missing or incorrect nonce validation on the addedit functionality. This makes it possible for unauthenticated attackers to upload arbitrary files via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

Why this priority

Critical severity

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

Risk facts

CVSS score	9.6 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 66%)
CISA exploited list	No
Weakness	CWE-352
Published	2023-10-27
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

2023-10-27 12:15 UTCPublished CVE record published
2026-06-17 06:49 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-2023-5820?

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

Is CVE-2023-5820 being exploited?

CVE-2023-5820 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-2023-5820 affect?

CVE-2023-5820 affects thumbnail slider with lightbox. Severity is critical (CVSS 9.6). The Thumbnail Slider With Lightbox plugin for WordPress is vulnerable to Cross-Site Request Forgery in version 1.0. This is due to missing or incorrect nonce validation on the addedit functionality. This makes it possible for unauthenticate

How urgent is CVE-2023-5820?

Priority 42/100. Critical severity

Software pages

WordPress vulnerabilities

Related CVEs

CVE-2023-5621 MEDIUM 4.4 DOWNGRADE The Thumbnail Slider With Lightbox plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the I
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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