How severe is CVE-2023-33561?

CVE-2023-33561 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-33561 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-33561?

CVE-2023-33561 affects Phpjabbers Time Slots Booking Calendar. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-33561?

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-2023-33561 published?

CVE-2023-33561 was published on 2023-08-01 and last updated on 2026-06-17.

CVE-2023-33561

CVE-2023-33561 is a critical-severity vulnerability in Phpjabbers Time Slots Booking Calendar with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Phpjabbers Time Slots Booking Calendar
Published: 2023-08-01
Last modified: 2026-06-17

Description

Improper input validation of password parameter in PHP Jabbers Time Slots Booking Calendar v 3.3 results in insecure passwords.

Frequently asked questions

What is CVE-2023-33561?: Improper input validation of password parameter in PHP Jabbers Time Slots Booking Calendar v 3.3 results in insecure passwords.
How severe is CVE-2023-33561?: CVE-2023-33561 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-33561 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-33561?: CVE-2023-33561 affects Phpjabbers Time Slots Booking Calendar. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-33561?: 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-2023-33561 published?: CVE-2023-33561 was published on 2023-08-01 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:phpjabbers:time_slots_booking_calendar:3.3:*:*:*:*:*:*:*

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