CVE-2026-94488 json
Telegram Desktop before 6.9.4 allows XSS in the HTML exporter.
published 2026-09-21 48 d ago modified 2026-09-22 47 d ago also EUVD-2026-84030
- cvss
- 8.2
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.1%
- EPSS 0.1% chance of exploitation in 30 days, percentile 3%
- public exploits
- 0
- none known
Summary
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).
Patch / fix
- Telegram Telegram Desktop 6.9.4
- telegram-desktop Debian 14 5.7.2+ds-6
debian advisories DEBIAN-CVE-2026-94488
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- total
- Assessed
- 48 d ago
Exploit prediction
0.14% chance of exploitation in the next 30 days, higher than 3% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- expatch.com https://expatch.com/writeups/telegram-html-export-xss.html referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 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 |
| CNA | 3.1 | 8.2 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N |
| CNA | 4.0 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected products
- Telegram Telegram Desktop
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
github.com
/telegramdesktop/tdesktop/commit/8457d13aa795fadf99c955d2a04f00ebc3c59df9
patch
-
github.com
/telegramdesktop/tdesktop/commit/52c779bffa8dde3c5c09826add2607328fae0924
related
-
expatch.com
/writeups/telegram-html-export-xss.html
third-party-advisory, technical-description, exploit
-
github.com
/telegramdesktop/tdesktop/releases/tag/v6.9.4
release-notes
-
github.com
/telegramdesktop/tdesktop/blob/v6.9.3/Telegram/SourceFiles/export/output/export_output_html.cpp
related
-
thehackernews.com
/2026/09/telegram-desktop-flaw-lets-hidden.html
media-coverage
Sources
- CVE List CVE-2026-94488
- NVD CVE-2026-94488
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.