How severe is CVE-2023-33563?

CVE-2023-33563 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-33563 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-33563?

CVE-2023-33563 affects Phpjabbers Time Slots Booking Calendar. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-33563?

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

When was CVE-2023-33563 published?

CVE-2023-33563 was published on 2023-08-01 and last updated on 2026-06-17.

CVE-2023-33563

CVE-2023-33563 is a high-severity vulnerability in Phpjabbers Time Slots Booking Calendar with a CVSS 3.x base score of 8.8. 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-287.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 1% (43rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Phpjabbers Time Slots Booking Calendar
Published: 2023-08-01
Last modified: 2026-06-17

Description

In PHP Jabbers Time Slots Booking Calendar 3.3 , lack of verification when changing an email address and/or password (on the Profile Page) allows remote attackers to take over accounts.

Frequently asked questions

What is CVE-2023-33563?: In PHP Jabbers Time Slots Booking Calendar 3.3 , lack of verification when changing an email address and/or password (on the Profile Page) allows remote attackers to take over accounts.
How severe is CVE-2023-33563?: CVE-2023-33563 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-33563 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-33563?: CVE-2023-33563 affects Phpjabbers Time Slots Booking Calendar. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-33563?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2023-33563 published?: CVE-2023-33563 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:*:*:*:*:*:*:*

More vulnerabilities in Phpjabbers Time Slots Booking Calendar

CVE-2023-33562 — Critical (CVSS 9.8): User enumeration is found in in PHP Jabbers Time Slots Booking Calendar v3.3. This issue occurs during password…
CVE-2023-33561 — Critical (CVSS 9.8): Improper input validation of password parameter in PHP Jabbers Time Slots Booking Calendar v 3.3 results in insecure…
CVE-2023-48826 — High (CVSS 8.8): Time Slots Booking Calendar 4.0 is vulnerable to CSV Injection via the unique ID field of the Reservations List.
CVE-2023-48833 — High (CVSS 7.5): A lack of rate limiting in pjActionAJaxSend in Time Slots Booking Calendar 4.0 allows attackers to cause resource…
CVE-2023-33564 — Medium (CVSS 6.1): There is a Cross Site Scripting (XSS) vulnerability in the "theme" parameter of preview.php in PHPJabbers Time Slots…
CVE-2023-33560 — Medium (CVSS 6.1): There is a Cross Site Scripting (XSS) vulnerability in "cid" parameter of preview.php in PHPJabbers Time Slots Booking…

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Other CWE-287 (Improper Authentication) vulnerabilities

CVE-2026-45480 — Critical (CVSS 10.0): Improper authentication in Azure Active Directory allows an unauthorized attacker to elevate privileges over a network.
CVE-2026-46389 — Critical (CVSS 10.0): UDS Identity Config builds the Keycloak configuration image (realm, plugins, theme, truststore, JARs) consumed by UDS…
CVE-2026-10611 — Critical (CVSS 10.0): An authentication bypass vulnerability exists in MISP when LDAP mixed authentication is enabled with OTP enforcement.…
CVE-2026-47280 — Critical (CVSS 10.0): Improper authentication in Azure Resource Manager (ARM) allows an unauthorized attacker to elevate privileges over a…
CVE-2026-42822 — Critical (CVSS 10.0): Improper authentication in Azure Local Disconnected Operations allows an unauthorized attacker to elevate privileges…
CVE-2026-20182 — Critical (CVSS 10.0): May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and…

Browse all CWE-287 (Improper Authentication) vulnerabilities →