CVE-2026-94488
- State
- Published
- Severity
- 8.3 High
- Published
- Sep 21, 2026
- Updated
- Sep 21, 2026
- Reserved
- Sep 21, 2026
Description
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).
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.3 High | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N | mitre |
| 3.1 | 8.2 High | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N | mitre |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
Telegram DesktopTelegram |
|
References
- tdesktop commit 8457d13a - Fix escaping in HTML export of keyboardspatch
- tdesktop commit 52c779bf - Added support of inline markup reply to HTML export (introduces the issue)related
- Telegram Desktop v6.9.4 - first release containing the fixrelease-notes
- Vulnerable export_output_html.cpp as shipped in v6.9.3related
- Expatch LLC technical write-upthird-party-advisorytechnical-descriptionexploit
- https://thehackernews.com/2026/09/telegram-desktop-flaw-lets-hidden.htmlmedia-coverage
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