How severe is CVE-2023-5820?

CVE-2023-5820 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-5820 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-5820?

CVE-2023-5820 affects I13websolution Thumbnail Slider With Lightbox. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-5820?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2023-5820 published?

CVE-2023-5820 was published on 2023-10-27 and last updated on 2026-06-17.

CVE-2023-5820

CVE-2023-5820 is a critical-severity vulnerability in I13websolution Thumbnail Slider With Lightbox with a CVSS 3.x base score of 9.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-352.

Key facts

Severity: Critical (CVSS 3.x base score 9.6)
EPSS exploit prediction: 0% (24th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-352
Affected product: I13websolution Thumbnail Slider With Lightbox
Published: 2023-10-27
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2023-5820?: 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.
How severe is CVE-2023-5820?: CVE-2023-5820 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-5820 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-5820?: CVE-2023-5820 affects I13websolution Thumbnail Slider With Lightbox. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-5820?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2023-5820 published?: CVE-2023-5820 was published on 2023-10-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:i13websolution:thumbnail_slider_with_lightbox:1.0:*:*:*:*:wordpress:*:*

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