Which versions of Telegram Desktop are affected by EUVD-2026-84030?

Telegram Desktop, a widely used messaging application, is affected by a high-severity vulnerability (CVE-2026-94488) that allows attackers to execute malicious scripts when a user exports a chat…. A patch is available.

Is there a public PoC exploit available for EUVD-2026-84030?

Yes, a public proof-of-concept exploit is available for EUVD-2026-84030. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate EUVD-2026-84030?

Within 24 hours, inventory all instances of Telegram Desktop across the organization and immediately upgrade to version 6.9.4 or later. Instruct users to avoid opening HTML files generated from Telegram chat exports until patched. Within 7 days, verify that all installations are updated to 6.9.4 and enforce automatic updates where possible; consider temporarily disabling the HTML export feature via group policy if feasible. Within 30 days, review and update policies regarding the use of third-party messaging applications, implement application whitelisting to prevent installation of vulnerable versions, and conduct user awareness training on the risks of opening untrusted HTML files.

Telegram Desktop EUVD-2026-84030

Q: What is the CVSS score of EUVD-2026-84030?

EUVD-2026-84030 has a CVSS 4.0 base score of 8.3 (High). CVSS 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/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. EPSS exploitation probability: 0.1%.

| CVE-2026-94488 HIGH

Cross-site Scripting (XSS) (CWE-79)

2026-09-21 mitre

GHSA-58p4-4g24-j8vp

XSS Telegram Desktop Telegram

8.3

CVSS 4.0 · Vendor: mitre

Severity by source

Vendor (mitre) PRIMARY

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/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

vuln.today AI

5.0 MEDIUM

Trigger is local HTML export + opening the file (AV:L, UI:R); no attacker privilege on victim system (PR:N); XSS crosses into the browser (S:C) but file:// context limits impact to C:L/I:L.

3.1 AV:L/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

4.0 AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (mitre).

CVSS VectorVendor: mitre

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Scope

Lifecycle Timeline

POC Analysis Generated

Sep 21, 2026 - 19:22 vuln.today

Analysis Generated

Sep 21, 2026 - 18:16 vuln.today

CVE Published

Sep 21, 2026 - 17:29 cve.org

HIGH 8.3

DescriptionCVE.org

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).

AnalysisAI

Telegram Desktop before 6.9.4 fails to escape inline-keyboard button text when a chat is exported to HTML, so attacker-controlled button captions are written verbatim into the generated file and execute as script when the victim opens that HTML in a browser. Exploitation is tightly gated: the victim must have used the HTML export feature, must have an attacker-crafted message forwarded into a group they belong to (the original author does not need to be a group member), and must then open the resulting HTML file locally. …

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Vulnerability AssessmentAI

Exploitation	Exploitation is gated on multiple specific preconditions. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	The vendor CVSS 4.0 vector (CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N, 8.3 High) captures the core of this flaw accurately in structure but is arguably inflated in impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation	Vendor-released patch: upgrade Telegram Desktop to 6.9.4 or later, and preferably to the first fixed stable release 7.0.1, available from https://github.com/telegramdesktop/tdesktop/releases/tag/v6.9.4; the code-level fix is visible in commits 8457d13aa795fadf99c955d2a04f00ebc3c59df9 and 52c779bffa8dde3c5c09826add2607328fae0924, which SerializeString-escape the button text and escape backslash/single-quote characters in the ShowTextCopied() script literal. … Detailed patch versions, workarounds, and compensating controls in full report.