How severe is CVE-2023-40556?

CVE-2023-40556 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2023-40556 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-40556?

CVE-2023-40556 affects Toolstack Schedule Posts Calendar. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-40556?

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

When was CVE-2023-40556 published?

CVE-2023-40556 was published on 2023-10-06 and last updated on 2026-06-17.

CVE-2023-40556

CVE-2023-40556 is a medium-severity vulnerability in Toolstack Schedule Posts Calendar with a CVSS 3.x base score of 4.3. 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: Medium (CVSS 3.x base score 4.3)
EPSS exploit prediction: 0% (12th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-352
Affected product: Toolstack Schedule Posts Calendar
Published: 2023-10-06
Last modified: 2026-06-17

Description

Cross-Site Request Forgery (CSRF) vulnerability in Greg Ross Schedule Posts Calendar plugin <= 5.2 versions.

Frequently asked questions

What is CVE-2023-40556?: Cross-Site Request Forgery (CSRF) vulnerability in Greg Ross Schedule Posts Calendar plugin <= 5.2 versions.
How severe is CVE-2023-40556?: CVE-2023-40556 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2023-40556 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-40556?: CVE-2023-40556 affects Toolstack Schedule Posts Calendar. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-40556?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-40556 published?: CVE-2023-40556 was published on 2023-10-06 and last updated on 2026-06-17.

References

https://patchstack.com/database/vulnerability/schedule-posts-calendar/wordpress-schedule-posts-calendar-plugin-5-2-cross-site-request-forgery-csrf-vulnerability?_s_id=cve

Affected products (1)

cpe:2.3:a:toolstack:schedule_posts_calendar:*:*:*:*:*:wordpress:*:*

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