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CVE-2026-54743: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in LemmyNet lemmyCVE-2026-54743 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 a way that allows unescaped HTML injection. This can enable an approved member or remote federated instance to inject malicious JavaScript that executes in the context of the lemmy-ui origin. Although Content Security Policy (CSP) can prevent exploitation in production, the default self-hosted deployment does not serve a CSP, leaving it vulnerable. The vulnerability 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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