CVE-2026-43900: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in ThinkInAIXYZ deepchat
CVE-2026-43900 is a critical Cross-Site Scripting (XSS) vulnerability in ThinkInAIXYZ deepchat versions prior to 1. 0. 4-beta. 1. It arises from improper input neutralization during web page generation, specifically in the SVG sanitizer component. The sanitizer attempts to block javascript: protocols using plain-text regex but fails to handle HTML entity decoding before Vue's v-html rendering. This allows attackers to craft SVG artifacts with obfuscated entities that bypass the sanitizer and execute arbitrary JavaScript when rendered. The vulnerability is fixed in version 1. 0. 4-beta.
AI Analysis
Technical Summary
DeepChat, an open-source AI agent platform, had an XSS vulnerability (CWE-79) due to a mismatch between backend validation and frontend rendering. The SVGSanitizer component (src/main/lib/svgSanitizer.ts) used regex to block javascript: protocols but did not account for HTML entity decoding before Vue's v-html DOM insertion in SvgArtifact.vue. Attackers could embed obfuscated javascript: payloads (e.g., javascript:alert(1)) in SVG artifacts, bypassing the sanitizer and enabling arbitrary JavaScript execution upon user interaction with the SVG element. This issue affects versions before 1.0.4-beta.1 and is resolved in that release.
Potential Impact
Successful exploitation allows an attacker to execute arbitrary JavaScript in the context of the victim's browser session when interacting with malicious SVG content. This can lead to full compromise of confidentiality and integrity of the affected web application session (CVSS impact: High confidentiality and integrity impact, no availability impact). No known active exploits have been reported.
Mitigation Recommendations
This vulnerability is fixed in ThinkInAIXYZ deepchat version 1.0.4-beta.1. Users should upgrade to this version or later to remediate the issue. Since no official patch link or advisory is provided, verify the upgrade from the vendor's official release notes or repository. Patch status is not yet confirmed via vendor advisory; check the vendor's official channels for current remediation guidance.
CVE-2026-43900: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in ThinkInAIXYZ deepchat
Description
CVE-2026-43900 is a critical Cross-Site Scripting (XSS) vulnerability in ThinkInAIXYZ deepchat versions prior to 1. 0. 4-beta. 1. It arises from improper input neutralization during web page generation, specifically in the SVG sanitizer component. The sanitizer attempts to block javascript: protocols using plain-text regex but fails to handle HTML entity decoding before Vue's v-html rendering. This allows attackers to craft SVG artifacts with obfuscated entities that bypass the sanitizer and execute arbitrary JavaScript when rendered. The vulnerability is fixed in version 1. 0. 4-beta.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
DeepChat, an open-source AI agent platform, had an XSS vulnerability (CWE-79) due to a mismatch between backend validation and frontend rendering. The SVGSanitizer component (src/main/lib/svgSanitizer.ts) used regex to block javascript: protocols but did not account for HTML entity decoding before Vue's v-html DOM insertion in SvgArtifact.vue. Attackers could embed obfuscated javascript: payloads (e.g., javascript:alert(1)) in SVG artifacts, bypassing the sanitizer and enabling arbitrary JavaScript execution upon user interaction with the SVG element. This issue affects versions before 1.0.4-beta.1 and is resolved in that release.
Potential Impact
Successful exploitation allows an attacker to execute arbitrary JavaScript in the context of the victim's browser session when interacting with malicious SVG content. This can lead to full compromise of confidentiality and integrity of the affected web application session (CVSS impact: High confidentiality and integrity impact, no availability impact). No known active exploits have been reported.
Mitigation Recommendations
This vulnerability is fixed in ThinkInAIXYZ deepchat version 1.0.4-beta.1. Users should upgrade to this version or later to remediate the issue. Since no official patch link or advisory is provided, verify the upgrade from the vendor's official release notes or repository. Patch status is not yet confirmed via vendor advisory; check the vendor's official channels for current remediation guidance.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-04T16:11:33.085Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a028743cbff5d86108b506b
Added to database: 5/12/2026, 1:49:55 AM
Last enriched: 5/12/2026, 1:51:38 AM
Last updated: 5/12/2026, 3:31:29 AM
Views: 2
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