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TI-2026-63443 Aliases CVE-2026-94488GHSA-58p4-4g24-j8vp

Cross-site scripting in Telegram Desktop

Priority HIGH 71CWE-79Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Active
Attack complexity
Low
Attack requirements
None
Impact type
Cross-site scripting
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.

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).

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00139 3rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed Telegram Desktop (Telegram): 6.9.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
TelegramTelegram Desktop4.15.1 to before 6.9.46.9.4Patch availableCNA
  • Telegram Desktop VendorTelegram Affected 4.15.1 to before 6.9.4 Fixed in 6.9.4 Patch available CNA

Remediation

  • Fix · CNA Telegram Desktop (Telegram) Fixed in 6.9.4

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-94488
  2. 2026-10-03 Alias added: GHSA-58p4-4g24-j8vp

References

Exploit 1

Patch 1

Other 4

  • TI-2026-69140 Telegram Desktop IPC Record Injection Enables File Exfiltration CVSS 4.0HIGH 8.6
  • TI-2018-11088 An issue was discovered in the org.telegram.messenger application 4.8.11 for Android. CVSS 3.0MEDIUM 6.8
  • TI-2021-10892 The Telegram app 7.6.2 for iOS allows remote authenticated users to cause a denial of… CVSS 3.1MEDIUM 5.7
  • TI-2023-11787 Telegram 9.3.1 and 9.4.0 allows attackers to access restricted files, microphone ,or… CVSS 3.1MEDIUM 5.5
  • TI-2026-06783 Telegram Desktop Bot API url_auth_box.cpp RequestButton null pointer dereference CVSS 4.0MEDIUM 5.3
  • TI-2021-22409 Telegram Desktop 2.9.2 - Denial of Service (PoC) CVSS 4.0MEDIUM 4.6
See all 40 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences