How severe is CVE-2024-8549?

CVE-2024-8549 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-2024-8549 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-8549?

CVE-2024-8549 affects Xtendify Simple Calendar. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2024-8549?

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

Does CVE-2024-8549 have an EU (EUVD) identifier?

Yes. CVE-2024-8549 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-49256.

When was CVE-2024-8549 published?

CVE-2024-8549 was published on 2024-09-25 and last updated on 2026-06-17.

CVE-2024-8549

CVE-2024-8549 is a medium-severity vulnerability in Xtendify Simple Calendar 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% (37th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-49256
Weakness: CWE-79
Affected product: Xtendify Simple Calendar
Published: 2024-09-25
Last modified: 2026-06-17

Description

The Simple Calendar – Google Calendar Plugin plugin for WordPress is vulnerable to Reflected Cross-Site Scripting due to the use of add_query_arg without appropriate escaping on the URL in all versions up to, and including, 3.4.2. 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-2024-8549?: The Simple Calendar – Google Calendar Plugin plugin for WordPress is vulnerable to Reflected Cross-Site Scripting due to the use of add_query_arg without appropriate escaping on the URL in all versions up to, and including, 3.4.2. 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-2024-8549?: CVE-2024-8549 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-2024-8549 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-8549?: CVE-2024-8549 affects Xtendify Simple Calendar. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2024-8549?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2024-8549 have an EU (EUVD) identifier?: Yes. CVE-2024-8549 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-49256.
When was CVE-2024-8549 published?: CVE-2024-8549 was published on 2024-09-25 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:xtendify:simple_calendar:*:*:*:*:*:wordpress:*:*

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CVE-2023-46189 — Medium (CVSS 4.3): Cross-Site Request Forgery (CSRF) vulnerability in Simple Calendar – Google Calendar Plugin <= 3.2.5 versions.

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