CVE-2026-35208Public exploitNetwork attack vector

Page manipulation via raw external stream titles

Published Apr 6, 2026 · Updated Apr 6, 2026

HTML injection in Lichess Lila allows remote authenticated users to alter the streamer listing and homepage through a crafted stream title. TwitchApi and YoutubeApi stored external titles as Html, while cleanStatus only trimmed them before Scalatags inserted the values as raw DOM markup. Exploitation requires an approved streamer to go live with a crafted Twitch or YouTube title; CSP blocks inline script execution, but injected markup can force navigation or mislead viewers.

CVSS severity5.3
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

HTML injection in Lichess Lila allows remote authenticated users to alter the streamer listing and homepage through a crafted stream title. TwitchApi and YoutubeApi stored external titles as Html, while cleanStatus only trimmed them before Scalatags inserted the values as raw DOM markup. Exploitation requires an approved streamer to go live with a crafted Twitch or YouTube title; CSP blocks inline script execution, but injected markup can force navigation or mislead viewers.

The record

CVE
CVE-2026-35208
Published
Apr 6, 2026
Updated
Apr 6, 2026
Vendor
Lichess
Product
Lila
Classifications
CWE-79, CWE-116, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0d5002696ae705e1888bf77de107c73de57bb1b3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Lichess · Lilaversion=< 0d5002696ae705e1888bf77de107c73de57bb1b3

Published CVSS scores

5.4NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
5.3GitHub, Inc.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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-116Improper Encoding or Escaping of Output
T1189Drive-by Compromise

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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