XSS in Telegram Desktop
CVE-2026-94488
Telegram Desktop before 6.9.4 allows XSS in the HTML exporter. (The first fixed stable version is 7.0.1.) This occurs in button.text.toUtf8 in export_output_html.cpp. Exploitation cannot occur unless HTML export was used by a victim. However, the exploit payload can be exported if a message were forwarded into a group by a member (it is not necessary for the message author to be a member of a group).
Vulnerability class: XSS (Cross-Site Scripting)
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N.
Affected products
Weakness classification (CWE)
References
- cve@mitre.org (patch)
- cve@mitre.org (related)
- cve@mitre.org (release-notes)
- cve@mitre.org (related)
- cve@mitre.org (technical-description, exploit, third-party-advisory)
- cve@mitre.org (media-coverage)
Frequently asked questions
- What is CVE-2026-94488?
- CVE-2026-94488 is a high-severity vulnerability in Telegram Desktop, classified under Cross-site Scripting. CVSS score: 8.2/10. Published 2026-09-21.
- How severe is CVE-2026-94488?
- High severity. CVSS v3 base score is 8.2 out of 10.