How severe is CVE-2023-39939?

CVE-2023-39939 has a CVSS 3.x base score of 9.1, 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 none.

Is CVE-2023-39939 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-39939?

CVE-2023-39939 affects Luxsoft Luxcal Web Calendar. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-39939?

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-2023-39939 published?

CVE-2023-39939 was published on 2023-08-21 and last updated on 2026-06-17.

CVE-2023-39939

CVE-2023-39939 is a critical-severity vulnerability in Luxsoft Luxcal Web Calendar with a CVSS 3.x base score of 9.1. 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-89.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-89
Affected product: Luxsoft Luxcal Web Calendar
Published: 2023-08-21
Last modified: 2026-06-17

Description

SQL injection vulnerability in LuxCal Web Calendar prior to 5.2.3M (MySQL version) and LuxCal Web Calendar prior to 5.2.3L (SQLite version) allows a remote unauthenticated attacker to execute arbitrary queries against the database and obtain or alter the information in it.

Frequently asked questions

What is CVE-2023-39939?: SQL injection vulnerability in LuxCal Web Calendar prior to 5.2.3M (MySQL version) and LuxCal Web Calendar prior to 5.2.3L (SQLite version) allows a remote unauthenticated attacker to execute arbitrary queries against the database and obtain or alter the information in it.
How severe is CVE-2023-39939?: CVE-2023-39939 has a CVSS 3.x base score of 9.1, 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 none.
Is CVE-2023-39939 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-39939?: CVE-2023-39939 affects Luxsoft Luxcal Web Calendar. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-39939?: 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-2023-39939 published?: CVE-2023-39939 was published on 2023-08-21 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:luxsoft:luxcal_web_calendar:*:*:*:*:*:*:*:*

More vulnerabilities in Luxsoft Luxcal Web Calendar

CVE-2025-25222 — Critical (CVSS 9.8): The LuxCal Web Calendar prior to 5.3.3M (MySQL version) and prior to 5.3.3L (SQLite version) contains an SQL injection…
CVE-2025-25221 — Critical (CVSS 9.8): The LuxCal Web Calendar prior to 5.3.3M (MySQL version) and prior to 5.3.3L (SQLite version) contains an SQL injection…
CVE-2023-46700 — Critical (CVSS 9.8): SQL injection vulnerability in LuxCal Web Calendar prior to 5.2.4M (MySQL version) and LuxCal Web Calendar prior to…
CVE-2025-25224 — High (CVSS 7.5): The LuxCal Web Calendar prior to 5.3.3M (MySQL version) and prior to 5.3.3L (SQLite version) contains a missing…
CVE-2023-47175 — Medium (CVSS 6.1): Cross-site scripting vulnerability in LuxCal Web Calendar prior to 5.2.4M (MySQL version) and LuxCal Web Calendar prior…
CVE-2023-39543 — Medium (CVSS 6.1): Cross-site scripting vulnerability in LuxCal Web Calendar prior to 5.2.3M (MySQL version) and LuxCal Web Calendar prior…

All CVEs affecting Luxsoft Luxcal Web Calendar →

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