CVE-2026-94488CWE-79cross-site-scripting

CVE-2026-94488

High · published September 21, 2026

CVSS v3.1
8.2
EPSS
0%
Percentile
2.7
In the wild
Unconfirmed
What it is

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).

The record
Technical detail
CVSS v3.1
8.2 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
CVSS v4.0
8.3 · 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
EPSS
0.00136 · 2.7th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-09-21T22:17Z
References (6)
https://expatch.com/writeups/telegram-html-export-xss.html · [email protected]https://github.com/telegramdesktop/tdesktop/blob/v6.9.3/Telegram/SourceFiles/export/output/export_output_html.cpp · [email protected]https://github.com/telegramdesktop/tdesktop/commit/52c779bffa8dde3c5c09826add2607328fae0924 · [email protected]https://github.com/telegramdesktop/tdesktop/commit/8457d13aa795fadf99c955d2a04f00ebc3c59df9 · [email protected]https://github.com/telegramdesktop/tdesktop/releases/tag/v6.9.4 · [email protected]https://thehackernews.com/2026/09/telegram-desktop-flaw-lets-hidden.html · [email protected]
EPSS history
Timeline
  • 23 SEP 03:49Z
    EPSS moved — → 0%
    epss
  • 21 SEP 17:29Z
    Telegram Desktop before 6.9.4 allows XSS in the HTML exporter
    cvelistv5