{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "source": "REFERENCES"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0d5002696ae705e1888bf77de107c73de57bb1b3"
            }
          ],
          "repo": "https://github.com/lichess-org/lila",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-v7gh-939r-pfjq"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-116",
      "CWE-79"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35208.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "fixed": "0d5002696ae705e1888bf77de107c73de57bb1b3"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "lichess.org is the forever free, adless and open source chess server. Any approved streamer can inject arbitrary HTML into /streamer and the homepage “Live streams” widget by placing markup in their Twitch/YouTube stream title. CSP is present and blocks inline script execution, but the issue is still a server-side HTML injection sink. To trigger this, a Lichess account only needs to satisfy the normal streamer requirements and get approved. Per Streamer.canApply, that means an account older than 2 days with at least 15 games, or a verified/titled account. After moderator approval, once the streamer goes live, Lichess pulls the platform title and renders it into the UI as-is. No extra privileges are needed beyond a normal approved streamer profile. This vulnerability is fixed with commit 0d5002696ae705e1888bf77de107c73de57bb1b3.",
  "id": "CVE-2026-35208",
  "modified": "2026-07-08T05:39:08.975378225Z",
  "published": "2026-04-06T20:06:25.821Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://vimeo.com/1175908262"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35208.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/lichess-org/lila/security/advisories/GHSA-v7gh-939r-pfjq"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-35208"
    },
    {
      "type": "FIX",
      "url": "https://github.com/lichess-org/lila/commit/0d5002696ae705e1888bf77de107c73de57bb1b3"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "lichess.org has an Unsanitized Stream Title Injection on /streamer"
}