VulnSocial

CVE-2026-35208Disclosure(lichess / lila)

LOWCVSS 5.4 · MEDIUM

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

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.

lichess CVEsBack to dashboard
0.0/ 10 priority

Sources & remediation

Patch / fix
Exploit / PoC references
Weakness type (CWE)
CWE-79CWE-116

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

AVAILABLE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • lila

Threat summary

  • 1 mentions across 1 observed day

What's happening

  • Technical details provided in 1 signal
  • Disclosure: 1 classified signal
  • 1 total mentions across 1 day

Affected systems

Vendors
lichess
Products
lila

Deep dive

Activity timeline1 mentions / 1d
00111Mentions · 2026-04-06: 1Technical Details · 2026-04-06: 104-06
Signal classification1 categories
Disclosure
1100.0%
Referenced assets2 URLs
By indicator
Full discourse1 post
  • CVE@CVEnew
    Disclosure

    CVE-2026-35208 http://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” w… https://www.cve.org/CVERecord?id=CVE-2026-35208

    Post summary

    The post discloses that approved streamers on lichess.org can inject arbitrary HTML into the /streamer endpoint and the Live Streams homepage, indicating an integrity/ XSS-type vulnerability (CVE-2026-35208).

    00000146
    57.0K followersView on X
CPE platform detail1 entries

1 of 1 entries

PartVendorProductVersionTarget SWTarget HW
Applichesslila---

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