How severe is CVE-2023-40766?

CVE-2023-40766 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-2023-40766 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-40766?

CVE-2023-40766 affects Phpjabbers Ticket Support Script. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-40766?

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-2023-40766 published?

CVE-2023-40766 was published on 2023-08-28 and last updated on 2026-06-17.

CVE-2023-40766

CVE-2023-40766 is a critical-severity vulnerability in Phpjabbers Ticket Support Script 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. The underlying weakness is classified as CWE-209.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-209
Affected product: Phpjabbers Ticket Support Script
Published: 2023-08-28
Last modified: 2026-06-17

Description

User enumeration is found in in PHPJabbers Ticket Support Script v3.2. 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-2023-40766?: User enumeration is found in in PHPJabbers Ticket Support Script v3.2. 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-2023-40766?: CVE-2023-40766 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-2023-40766 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-40766?: CVE-2023-40766 affects Phpjabbers Ticket Support Script. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-40766?: 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-2023-40766 published?: CVE-2023-40766 was published on 2023-08-28 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:phpjabbers:ticket_support_script:3.2:*:*:*:*:*:*:*

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