How severe is CVE-2023-36127?

CVE-2023-36127 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2023-36127 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-36127?

CVE-2023-36127 affects Phpjabbers Appointment Scheduler. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-36127?

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-2023-36127 published?

CVE-2023-36127 was published on 2023-10-10 and last updated on 2026-06-17.

CVE-2023-36127

CVE-2023-36127 is a high-severity vulnerability in Phpjabbers Appointment Scheduler with a CVSS 3.x base score of 7.5. 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-203.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (44th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-203
Affected product: Phpjabbers Appointment Scheduler
Published: 2023-10-10
Last modified: 2026-06-17

Description

User enumeration is found in in PHPJabbers Appointment Scheduler 3.0. This issue occurs during password recovery, where a difference in messages could allow an attacker to determine if the user is valid or not, enabling a brute force attack with valid users.

Frequently asked questions

What is CVE-2023-36127?: User enumeration is found in in PHPJabbers Appointment Scheduler 3.0. This issue occurs during password recovery, where a difference in messages could allow an attacker to determine if the user is valid or not, enabling a brute force attack with valid users.
How severe is CVE-2023-36127?: CVE-2023-36127 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2023-36127 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-36127?: CVE-2023-36127 affects Phpjabbers Appointment Scheduler. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-36127?: 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-2023-36127 published?: CVE-2023-36127 was published on 2023-10-10 and last updated on 2026-06-17.

References

https://medium.com/%40bcksec/multiple-vulnerabilities-in-php-jabbers-scripts-25af4afcadd4

Affected products (1)

cpe:2.3:a:phpjabbers:appointment_scheduler:3.0:*:*:*:*:*:*:*

More vulnerabilities in Phpjabbers Appointment Scheduler

CVE-2023-48841 — High (CVSS 8.8): Appointment Scheduler 3.0 is vulnerable to CSV Injection via a Language > Labels > Export action.
CVE-2023-48840 — High (CVSS 7.5): A lack of rate limiting in pjActionAjaxSend in Appointment Scheduler 3.0 allows attackers to cause resource exhaustion.
CVE-2014-10001 — Medium (CVSS 6.8): Multiple cross-site request forgery (CSRF) vulnerabilities in PHPJabbers Appointment Scheduler 2.0 allow remote…
CVE-2023-36126 — Medium (CVSS 6.1): There is a Cross Site Scripting (XSS) vulnerability in the "theme" parameter of preview.php in PHPJabbers Appointment…
CVE-2023-48839 — Medium (CVSS 5.4): Appointment Scheduler 3.0 is vulnerable to Multiple Stored Cross-Site Scripting (XSS) issues via the name,…
CVE-2023-48838 — Medium (CVSS 5.4): Appointment Scheduler 3.0 is vulnerable to Multiple HTML Injection issues via the SMS API Key or Default Country Code.

All CVEs affecting Phpjabbers Appointment Scheduler →

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Browse all CWE-203 (Observable Discrepancy) vulnerabilities →