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Vulnerability record · CVE-2023-1720 · published 1 November 2023

CVE-2023-1720: Bitrix24 unrestricted file upload vulnerability

Bitrix24 · Bitrix24

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.

8.0 CVSS 3.1 High EPSS 0.85% · top 43.5% CWE-434 · Unrestricted file upload
8.0CVSS 3.1 base score
0.85%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://starlabs.sg/advisories/23/23-1720/ ExploitThird Party Advisory
https://starlabs.sg/advisories/23/23-1720/ ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2023-1719Bitrix24 vulnerabilityGlobal variable extraction in bitrix/modules/main/tools.php in Bitrix24 22.0.300 allows unauthenticated remote attackers to (1) enumerate attachments…EPSS 5.0%9.8CVE-2022-27228Bitrix24 improper input validation vulnerabilityIn the vote (aka "Polls, Votes") module before 21.0.100 of Bitrix Site Manager, a remote unauthenticated attacker can execute arbitrary code.EPSS 21%9.8CVE-2020-13484Bitrix24 server-side request forgery (ssrf) vulnerabilityBitrix24 through 20.0.975 allows SSRF via an intranet IP address in the services/main/ajax.php?action=attachUrlPreview url parameter, if the destinat…EPSS 2.0%9.6CVE-2023-1716Bitrix24 cross-site scripting vulnerabilityCross-site scripting (XSS) vulnerability in Invoice Edit Page in Bitrix24 22.0.300 allows attackers to execute arbitrary JavaScript code in the victi…EPSS 0.72%9.6CVE-2023-1717Bitrix24 cross-site scripting vulnerabilityPrototype pollution in bitrix/templates/bitrix24/components/bitrix/menu/left_vertical/script.js in Bitrix24 22.0.300 allows remote attackers to execu…EPSS 1.1%8.8CVE-2023-1714Bitrix24 deserialization of untrusted data vulnerabilityUnsafe variable extraction in bitrix/modules/main/classes/general/user_options.php in Bitrix24 22.0.300 allows remote authenticated attackers to exec…EPSS 1.4%8.8CVE-2023-1713Bitrix24 unrestricted file upload vulnerabilityInsecure temporary file creation in bitrix/modules/crm/lib/order/import/instagram.php in Bitrix24 22.0.300 hosted on Apache HTTP Server allows remote…EPSS 1.2%7.5CVE-2023-1718Bitrix24 vulnerabilityImproper file stream access in /desktop_app/file.ajax.php?action=uploadfile in Bitrix24 22.0.300 allows unauthenticated remote attackers to cause den…EPSS 24%

Source: NIST National Vulnerability Database (record CVE-2023-1720), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.