Threat database

A cross-site scripting (XSS) vulnerability was identified in lichess-org's lila platform prior to a specific commit. The flaw allowed a user with permission to add a chapter to a study to inject attacker-controlled HTML and CSS via the PGN Annotator tag, which was rendered without proper escaping in the study's comments. Although the site's content security policy blocks injected JavaScript, the vulnerability could enable navigation to attacker-controlled sites, content spoofing, and CSS-based data exposure. This issue was fixed by a commit that properly escapes the injected content.

CVE-2026-35208 is a cross-site scripting (XSS) vulnerability in the lichess-org lila platform. Approved streamers can inject arbitrary HTML into the /streamer page and the homepage Live streams widget by placing markup in their Twitch or YouTube stream title. Although a Content Security Policy (CSP) blocks inline script execution, the vulnerability still allows server-side HTML injection. To become an approved streamer, an account must be older than 2 days with at least 15 games or be verified/titled, and then receive moderator approval. The vulnerability affects versions prior to commit 0d5002696ae705e1888bf77de107c73de57bb1b3 and has a CVSS 4.0 score of 5.3 (medium severity).