How severe is CVE-2023-1720?

CVE-2023-1720 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-1720 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-1720?

CVE-2023-1720 affects Bitrix24. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-1720?

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-2023-1720 published?

CVE-2023-1720 was published on 2023-11-01 and last updated on 2026-06-17.

CVE-2023-1720

CVE-2023-1720 is a critical-severity vulnerability in Bitrix24 with a CVSS 3.x base score of 9.6. 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-434.

Key facts

Severity: Critical (CVSS 3.x base score 9.6)
EPSS exploit prediction: 1% (54th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-434
Affected product: Bitrix24
Published: 2023-11-01
Last modified: 2026-06-17

Description

Lack of mime type response header in Bitrix24 22.0.300 allows authenticated remote attackers to execute arbitrary JavaScript code in the victim's browser, and possibly execute arbitrary PHP code on the server if the victim has administrator privilege, via uploading a crafted HTML file through /desktop_app/file.ajax.php?action=uploadfile.

Frequently asked questions

What is CVE-2023-1720?: Lack of mime type response header in Bitrix24 22.0.300 allows authenticated remote attackers to execute arbitrary JavaScript code in the victim's browser, and possibly execute arbitrary PHP code on the server if the victim has administrator privilege, via uploading a crafted HTML file through /desktop_app/file.ajax.php?action=uploadfile.
How severe is CVE-2023-1720?: CVE-2023-1720 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-1720 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-1720?: CVE-2023-1720 affects Bitrix24. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-1720?: 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-2023-1720 published?: CVE-2023-1720 was published on 2023-11-01 and last updated on 2026-06-17.

References

https://starlabs.sg/advisories/23/23-1720/

Affected products (1)

cpe:2.3:a:bitrix24:bitrix24:22.0.300:*:*:*:*:*:*:*

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