{"id":"CVE-2026-94488","aliases":["DEBIAN-CVE-2026-94488","EUVD-2026-84030","GHSA-58p4-4g24-j8vp"],"status":"published","title":"Telegram Desktop before 6.9.4 allows XSS in the HTML exporter. (The first fixed stable version is...","description":"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).","severity":{"version":"4.0","score":8.3,"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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00139,"percentile":0.03292,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79"],"published":"2026-09-21T17:29:01Z","modified":"2026-11-04T10:01:00Z","fixes":[{"ecosystem":"Debian:14","package":"telegram-desktop","fixed_in":["5.7.2+ds-6"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:14","package":"telegram-desktop","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.7.2+ds-6"}]}],"versions":["1.0.14-1","1.0.29-1","1.1.0-1","1.1.10-1","1.1.18-1","1.1.19-1","1.1.19-2","1.1.23-1","1.1.23-1~bpo9+1","1.1.23-2","1.1.23-3","1.2.1-1","1.2.1-2","1.2.15-1","1.2.17-1","1.2.6-1","1.2.6-2","1.3.10-1","1.3.10-2","1.3.14-1","1.3.7-1","1.4.0-1","1.5.11-1","1.5.2-1","1.5.4-1","1.5.8-1","1.7.0-1","1.7.14-1","1.8.15-1","1.8.15-2","1.8.15-2~bpo10+1","1.8.2-1","1.8.2-2","1.8.4-1","1.8.8-1","1.9.14+ds-1","1.9.14+ds-2","1.9.21+ds-1","1.9.8~slim-1","2.0.1+ds-1","2.1.0+ds-1","2.1.4+ds-1","2.1.5+ds-1","2.1.7+ds-1","2.1.7+ds-2","2.2.0+ds-1","2.2.0+ds-2","2.2.0+ds-2~bpo10+1","2.2.0+ds-3","2.2.0+ds-4","2.2.0+ds-5","2.5.8+ds-1","2.5.8+ds-2","2.6.1+ds-1","2.6.1+ds-1~bpo10+1","2.9.0+ds-1","2.9.0+ds1-2","2.9.2+ds-1","2.9.2+ds-1~bpo10+1","2.9.2+ds-1~bpo11+1","3.1.1+ds-1","3.1.1+ds-1~bpo10+1","3.1.1+ds-1~bpo11+1","3.1.1+ds-1~deb11u2","3.1.8+ds-1","3.3.0+ds-1","3.3.0+ds-2","3.4.2+ds-1","3.4.3+ds-1","3.4.3+ds-1~bpo11+1","3.4.8+ds-1","3.5.2+ds-1","3.5.2+ds-1~bpo11+1","3.6.0+ds-1","3.6.1+ds-1","3.6.1+ds-2","3.6.1+ds-3","3.7.1+ds-1","3.7.3+ds-1","3.7.3+ds-2","4.0.2+ds-1","4.0.2+ds-2","4.1.0+ds-1","4.1.1+ds-1","4.10.3+ds-1","4.10.3+ds-2","4.11.5+ds-1","4.11.8+ds-1","4.13.1+ds-1","4.14.3+ds-1","4.14.4+ds-1","4.14.9+ds-1","4.14.9+ds-1.1","4.2.0+ds-1","4.2.4+ds-1","4.2.4+ds-1~bpo11+1","4.3.1+ds-1","4.3.1+ds-1~bpo11+1","4.3.4+ds-1","4.3.4+ds-2","4.4.1+ds-1","4.4.1+ds-1~bpo11+1","4.5.3+ds-1","4.5.3+ds-1~bpo11+1","4.6.0+ds-1","4.6.2+ds-1","4.6.5+ds-1","4.6.5+ds-1~bpo11+1","4.6.5+ds-2","4.8.1+ds-1","4.8.1+ds-2","4.8.1+ds-2~bpo11+1","4.8.1+ds-2~bpo12+1","4.9.3+ds-1","4.9.7+ds-1","5.7.2+ds-2","5.7.2+ds-2~bpo13+1","5.7.2+ds-2~bpo13+2","5.7.2+ds-3","5.7.2+ds-4","5.7.2+ds-5"]}],"products":[{"vendor":"telegram","product":"telegram desktop"}],"references":[{"url":"https://github.com/telegramdesktop/tdesktop/commit/8457d13aa795fadf99c955d2a04f00ebc3c59df9","tags":["patch","fix"]},{"url":"https://github.com/telegramdesktop/tdesktop/commit/52c779bffa8dde3c5c09826add2607328fae0924","tags":["related","fix"]},{"url":"https://github.com/telegramdesktop/tdesktop/releases/tag/v6.9.4","tags":["release-notes","advisory"]},{"url":"https://github.com/telegramdesktop/tdesktop/blob/v6.9.3/Telegram/SourceFiles/export/output/export_output_html.cpp","tags":["related","web"]},{"url":"https://expatch.com/writeups/telegram-html-export-xss.html","tags":["third-party-advisory","technical-description","exploit","evidence"]},{"url":"https://thehackernews.com/2026/09/telegram-desktop-flaw-lets-hidden.html","tags":["media-coverage","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-94488","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-58p4-4g24-j8vp"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/94xxx/CVE-2026-94488.json","tags":["advisory"]},{"url":"https://github.com/telegramdesktop/tdesktop","tags":["package"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-94488","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-94488","description":"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).","status":"published","published":"2026-09-21T17:29:01.776Z","modified":"2026-09-21T17:51:18.874Z","cvss":[{"version":"4.0","score":8.3,"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","level":"high","assessor":"cna"},{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:19:53.786088Z"}],"euvd":[{"id":"EUVD-2026-84030","description":"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).","status":"published","published":"2026-09-21T17:29:01Z","modified":"2026-09-21T17:51:18Z","cvss":[{"version":"4.0","score":8.3,"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","level":"high"}],"updated_at":"2026-11-02T17:28:05.032636Z"}],"ghsa":[{"id":"GHSA-58p4-4g24-j8vp","title":"Telegram Desktop before 6.9.4 allows XSS in the HTML exporter. (The first fixed stable version is...","description":"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).","status":"published","published":"2026-09-21T18:32:09Z","modified":"2026-09-21T18:32:14Z","cvss":[{"version":"4.0","score":8.3,"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","level":"high"},{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N","level":"high"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:12:15.996228Z"}],"nvd":[{"id":"CVE-2026-94488","description":"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).","status":"published","published":"2026-09-21T18:17:17.173Z","modified":"2026-09-22T19:56:19.073Z","cvss":[{"version":"4.0","score":8.3,"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","level":"high","assessor":"secondary"},{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:12:50.368368Z"}],"osv":[{"id":"CVE-2026-94488","description":"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).","status":"published","published":"2026-09-21T17:29:01.776Z","modified":"2026-10-28T11:19:52.960333977Z","cvss":[{"version":"4.0","score":8.3,"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","level":"high"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:45:20.931171Z"},{"id":"DEBIAN-CVE-2026-94488","description":"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).","status":"published","published":"2026-09-21T18:17:17.173Z","modified":"2026-11-04T10:01:00.84984568Z","cvss":[{"version":"4.0","score":8.3,"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","level":"high"}],"updated_at":"2026-11-04T10:05:32.187009Z"}]}}