{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-94488", "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "state": "PUBLISHED", "assignerShortName": "mitre", "dateReserved": "2026-09-21T17:29:01.000Z", "datePublished": "2026-09-21T17:29:01.776Z", "dateUpdated": "2026-09-21T17:51:18.874Z" }, "containers": { "cna": { "affected": [ { "defaultStatus": "unaffected", "modules": [ "export_output_html.cpp (HTML chat-export module)" ], "platforms": [ "Windows", "MacOS", "Linux" ], "product": "Telegram Desktop", "programFiles": [ "Telegram/SourceFiles/export/output/export_output_html.cpp" ], "programRoutines": [ { "name": "HtmlWriter::Wrap::pushMessage" } ], "repo": "https://github.com/telegramdesktop/tdesktop", "vendor": "Telegram", "versions": [ { "lessThan": "6.9.4", "status": "affected", "version": "4.15.1", "versionType": "semver" } ] } ], "descriptions": [ { "lang": "en", "value": "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)." } ], "metrics": [ { "cvssV4_0": { "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "LOCAL", "baseScore": 8.3, "baseSeverity": "HIGH", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "ACTIVE", "valueDensity": "NOT_DEFINED", "vectorString": "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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED" }, "format": "CVSS", "scenarios": [ { "lang": "en", "value": "GENERAL" } ] }, { "cvssV3_1": { "attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 8.2, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N", "version": "3.1" }, "format": "CVSS", "scenarios": [ { "lang": "en", "value": "GENERAL" } ] } ], "problemTypes": [ { "descriptions": [ { "cweId": "CWE-79", "description": "CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')", "lang": "en", "type": "CWE" } ] } ], "providerMetadata": { "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre", "dateUpdated": "2026-09-21T17:29:01.776Z" }, "references": [ { "name": "tdesktop commit 8457d13a - Fix escaping in HTML export of keyboards", "tags": [ "patch" ], "url": "https://github.com/telegramdesktop/tdesktop/commit/8457d13aa795fadf99c955d2a04f00ebc3c59df9" }, { "name": "tdesktop commit 52c779bf - Added support of inline markup reply to HTML export (introduces the issue)", "tags": [ "related" ], "url": "https://github.com/telegramdesktop/tdesktop/commit/52c779bffa8dde3c5c09826add2607328fae0924" }, { "name": "Telegram Desktop v6.9.4 - first release containing the fix", "tags": [ "release-notes" ], "url": "https://github.com/telegramdesktop/tdesktop/releases/tag/v6.9.4" }, { "name": "Vulnerable export_output_html.cpp as shipped in v6.9.3", "tags": [ "related" ], "url": "https://github.com/telegramdesktop/tdesktop/blob/v6.9.3/Telegram/SourceFiles/export/output/export_output_html.cpp" }, { "name": "Expatch LLC technical write-up", "tags": [ "third-party-advisory", "technical-description", "exploit" ], "url": "https://expatch.com/writeups/telegram-html-export-xss.html" }, { "tags": [ "media-coverage" ], "url": "https://thehackernews.com/2026/09/telegram-desktop-flaw-lets-hidden.html" } ], "x_generator": { "engine": "CVE-Request-form 0.0.1" }, "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:a:telegram:telegram_desktop:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15.1", "versionEndExcluding": "6.9.4" } ] } ] } ] }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2026-09-21T17:51:08.525648Z", "id": "CVE-2026-94488", "options": [ { "Exploitation": "poc" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-21T17:51:18.874Z" } } ] } }