How severe is CVE-2023-6527?

CVE-2023-6527 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2023-6527 being actively exploited?

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

What products are affected by CVE-2023-6527?

CVE-2023-6527 affects I13websolution Email Subscription Popup. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-6527?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2023-6527 published?

CVE-2023-6527 was published on 2023-12-06 and last updated on 2026-06-17.

CVE-2023-6527

CVE-2023-6527 is a medium-severity vulnerability in I13websolution Email Subscription Popup with a CVSS 3.x base score of 6.1. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
EPSS exploit prediction: 0% (30th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: I13websolution Email Subscription Popup
Published: 2023-12-06
Last modified: 2026-06-17

Description

The Email Subscription Popup plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the HTTP_REFERER header in all versions up to, and including, 1.2.18 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.

Frequently asked questions

What is CVE-2023-6527?: The Email Subscription Popup plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the HTTP_REFERER header in all versions up to, and including, 1.2.18 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.
How severe is CVE-2023-6527?: CVE-2023-6527 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2023-6527 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-6527?: CVE-2023-6527 affects I13websolution Email Subscription Popup. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-6527?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-6527 published?: CVE-2023-6527 was published on 2023-12-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:i13websolution:email_subscription_popup:*:*:*:*:*:wordpress:*:*

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