CVE-2026-94488

HIGHPre-NVD 8.28.2—
EchelonGraph scoreHIGH confidence

Score 8.2 from GitHub Security Advisory (severity: HIGH) published 2026-09-21. a secondary CVSS source baseline 8.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this weekElevated
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.2Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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).

CVSS v3
8.2
EG Score
8.2(high)
EG Risk
53(Track*)
EG Risk 53/100SSVC: Track*

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity82% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
8%
KEV
Not listed

Published

September 21, 2026

Last Modified

September 22, 2026

Advisory Details (6)

Auto-updated Sep 21, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: github_commit, github_release.
generic🔴 Active Exploitation

Telegram Desktop Flaw Lets Hidden JavaScript Exfiltrate Messages From HTML Exports

https://thehackernews.com/2026/09/telegram-desktop-flaw-lets-hidden.html
generic

The Ghost in the Chat: stored XSS in Telegram Desktop HTML export - ExPatch

https://expatch.com/writeups/telegram-html-export-xss.html
generic

tdesktop/Telegram/SourceFiles/export/output/export_output_html.cpp at v6.9.3 · telegramdesktop/tdesktop · GitHub

https://github.com/telegramdesktop/tdesktop/blob/v6.9.3/Telegram/SourceFiles/export/output/export_output_html.cpp
github_release Patch Available

v 6.9.4

Patch available: telegramdesktop/tdesktop v6.9.4 (pre-release)

https://github.com/telegramdesktop/tdesktop/releases/tag/v6.9.4
github_commit

commit 52c779bffa8d (telegramdesktop/tdesktop)

Fix landed in telegramdesktop/tdesktop commit 52c779bffa8d — awaiting tagged release

https://github.com/telegramdesktop/tdesktop/commit/52c779bffa8dde3c5c09826add2607328fae0924
github_commit

commit 8457d13aa795 (telegramdesktop/tdesktop)

Fix landed in telegramdesktop/tdesktop commit 8457d13aa795 — awaiting tagged release

https://github.com/telegramdesktop/tdesktop/commit/8457d13aa795fadf99c955d2a04f00ebc3c59df9

Vendor Advisories for CVE-2026-94488(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 17× in last 7d / 17× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-24 23:24 UTCEG score recompute
  2. 2026-09-24 23:24 UTCGHSA enrichment
  3. 2026-09-24 14:04 UTCEPSS rescore
  4. 2026-09-24 10:35 UTCGHSA enrichment
  5. 2026-09-23 21:42 UTCEG score recompute
  6. 2026-09-23 21:42 UTCGHSA enrichment
  7. 2026-09-23 17:54 UTCEPSS rescore
  8. 2026-09-23 08:54 UTCGHSA enrichment
  9. 2026-09-22 20:05 UTCEG score recompute
  10. 2026-09-22 20:05 UTCGHSA enrichment
  11. 2026-09-22 16:01 UTCEPSS rescore
  12. 2026-09-22 07:16 UTCEG score recompute
  13. 2026-09-22 07:16 UTCGHSA enrichment
  14. 2026-09-21 18:27 UTCEG score recompute
  15. 2026-09-21 18:01 UTCEG score recompute
  16. 2026-09-21 17:30 UTCEG score recompute
  17. 2026-09-21 17:30 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-94488?
CVE-2026-94488 is a high vulnerability published on September 21, 2026. 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 exportoutputhtml.cpp. Exploitation cannot occur unless HTML export was used by a victim. However, the exploit payload can be exported if a message were…
When was CVE-2026-94488 disclosed?
CVE-2026-94488 was first published in the National Vulnerability Database on September 21, 2026, with the most recent update on September 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-94488 actively exploited?
CVE-2026-94488 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 91.6% of all scored CVEs.
What is the CVSS score of CVE-2026-94488?
CVE-2026-94488 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2026-94488?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-94488, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-94488

Explore →

Is Your Infrastructure Affected by CVE-2026-94488?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs