Threats Tagged 'cve-2026-54743'
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Threats Tagged 'cve-2026-54743'
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0 CVE-2026-54743 is a cross-site scripting (XSS) vulnerability in LemmyNet's lemmy-ui prior to version 0.19.19-beta.1. The issue arises from improper sanitization of Markdown-rendered content, specifically when image alt text is used in video media fallback elements. This allows an approved member or remote federated instance to inject malicious JavaScript that executes in the viewer's browser context. The vulnerability is mitigated in production by Content Security Policy (CSP), but default self-hosted deployments lack CSP, making them vulnerable. The flaw is fixed in lemmy-ui version 0.19.19-beta.1. Join the discussion | CVE Database V5 | 08/19/2026, 20:18:43 UTC Added: 08/20/2026, 11:11:47 UTC |
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