CVE-2026-65986: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in cvat-ai cvat
CVAT versions 2.5.0 through 2.66.0 contain a cross-site scripting (XSS) vulnerability related to how annotation guide assets are served. An attacker can influence the Content-Type header of files attached to annotation guides, causing a victim's browser to treat these files as HTML and execute embedded JavaScript. This vulnerability has been fixed in version 2.67.0.
AI Analysis
Technical Summary
The CVAT open source annotation tool has a vulnerability (CVE-2026-65986) in versions 2.5.0 through 2.66.0 where the Content-Type header for files attached to annotation guides can be manipulated by an attacker. This improper neutralization of input during web page generation (CWE-79) allows an attacker to cause a victim's browser to interpret uploaded files as HTML pages, enabling execution of arbitrary JavaScript. The issue is resolved in version 2.67.0.
Potential Impact
Successful exploitation can lead to execution of arbitrary JavaScript in the context of the victim's browser, potentially allowing actions such as session hijacking or other malicious behaviors that rely on script execution. The vulnerability is rated with a high severity CVSS 4.0 score of 8.5, indicating significant risk if exploited.
Mitigation Recommendations
Upgrade CVAT to version 2.67.0 or later, where this vulnerability has been fixed. No other official remediation or temporary fixes are indicated. Patch status is confirmed by the vendor advisory stating the fix in 2.67.0.
CVE-2026-65986: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in cvat-ai cvat
Description
CVAT versions 2.5.0 through 2.66.0 contain a cross-site scripting (XSS) vulnerability related to how annotation guide assets are served. An attacker can influence the Content-Type header of files attached to annotation guides, causing a victim's browser to treat these files as HTML and execute embedded JavaScript. This vulnerability has been fixed in version 2.67.0.
CVSS v4.0
Score 8.5high
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The CVAT open source annotation tool has a vulnerability (CVE-2026-65986) in versions 2.5.0 through 2.66.0 where the Content-Type header for files attached to annotation guides can be manipulated by an attacker. This improper neutralization of input during web page generation (CWE-79) allows an attacker to cause a victim's browser to interpret uploaded files as HTML pages, enabling execution of arbitrary JavaScript. The issue is resolved in version 2.67.0.
Potential Impact
Successful exploitation can lead to execution of arbitrary JavaScript in the context of the victim's browser, potentially allowing actions such as session hijacking or other malicious behaviors that rely on script execution. The vulnerability is rated with a high severity CVSS 4.0 score of 8.5, indicating significant risk if exploited.
Mitigation Recommendations
Upgrade CVAT to version 2.67.0 or later, where this vulnerability has been fixed. No other official remediation or temporary fixes are indicated. Patch status is confirmed by the vendor advisory stating the fix in 2.67.0.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-07-23T18:54:15.832Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a724e98bf8831d5396be701
Added to database: 08/04/2026, 20:42:00 UTC
Last enriched: 08/04/2026, 21:26:24 UTC
Last updated: 08/05/2026, 02:10:12 UTC
Views: 7
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