CVE-2023-1720Public exploitNetwork attack vector

Stored XSS via extensionless uploaded HTML

Published Nov 1, 2023 · Updated Sep 5, 2024

Stored XSS in Bitrix24 22.0.300 and earlier allows remote attackers to execute JavaScript in a victim's browser through a crafted file upload. /desktop_app/file.ajax.php?action=uploadfile stores extensionless HTML under a web-accessible path, and Apache serves it without a Content-Type header, causing browser content sniffing and script execution. Exploitation is unauthenticated but requires a victim to open the returned file URL; an administrator victim exposes the server's PHP command feature to system-command execution.

CVSS severity9.6
Critical
EPSS probability0.85%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Bitrix24 22.0.300 and earlier allows remote attackers to execute JavaScript in a victim's browser through a crafted file upload. /desktop_app/file.ajax.php?action=uploadfile stores extensionless HTML under a web-accessible path, and Apache serves it without a Content-Type header, causing browser content sniffing and script execution. Exploitation is unauthenticated but requires a victim to open the returned file URL; an administrator victim exposes the server's PHP command feature to system-command execution.

The record

CVE
CVE-2023-1720
Published
Nov 1, 2023
Updated
Sep 5, 2024
Vendor
Bitrix24
Product
Bitrix24
Classifications
CWE-434, CAPEC-592, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 1, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 5, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=22.0.300

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Bitrix24 · Bitrix24version=0 <=22.0.300

Published CVSS scores

8.0NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
9.6STAR Labs CNACVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
CAPEC-592Stored XSS
T1204.002User Execution Malicious File

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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