CVE-2018-20436

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{"affected": [{"affectedData": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "source": "cve@mitre.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:telegram:telegram:4.9.1:*:*:*:*:android:*:*", "matchCriteriaId": "ED6F0254-56FE-4131-8CB3-C1BB9EA96710", "vulnerable": true}, {"criteria": "cpe:2.3:a:telegram:web:0.7.0:*:*:*:*:*:*:*", "matchCriteriaId": "C8E93F9E-49CD-429A-ABE5-BF56C5D85340", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [{"sourceIdentifier": "cve@mitre.org", "tags": ["disputed"]}], "descriptions": [{"lang": "en", "value": "The \"secret chat\" feature in Telegram 4.9.1 for Android has a \"side channel\" in which Telegram servers send GET requests for URLs typed while composing a chat message, before that chat message is sent. There are also GET requests to other URLs on the same web server. This also affects one or more other Telegram products, such as Telegram Web-version 0.7.0. In addition, it can be interpreted as an SSRF issue. NOTE: a third party has reported that potentially unwanted behavior is caused by misconfiguration of the \"Secret chats > Preview links\" setting"}, {"lang": "es", "value": "**EN DISPUTA** La funcionalidad de \"chat secreto\" en la versi\u00f3n 4.9.1 de Telegram para Android tiene un \"canal lateral\" a trav\u00e9s del cual servidores Telegram env\u00edan peticiones GET para URL tipadas mientras redactan un mensaje de chat antes de enviarlo. Hay, tambi\u00e9n, peticiones GET a otras URL en el mismo servidor web. Esto tambi\u00e9n afecta a uno o m\u00e1s productos Telegram, como puede ser la versi\u00f3n web 0.7.0 de Telegram. Adem\u00e1s, puede interpretarse como un problema de Server-Side Request Forgery (SSRF). NOTA: un tercero ha reportado que comportamientos potencialmente no deseados son causados por la mala configuraci\u00f3n del ajuste de \"chats secretos > Previsualizaci\u00f3n de enlaces\"."}], "id": "CVE-2018-20436", "lastModified": "2026-06-17T01:52:50.410", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 6.8, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:P", "version": "2.0"}, "exploitabilityScore": 8.6, "impactScore": 6.4, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV30": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.0"}, "exploitabilityScore": 2.2, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2018-12-24T20:29:00.287", "references": [{"source": "cve@mitre.org", "tags": ["Exploit", "Third Party Advisory"], "url": "https://misteralfa-hack.blogspot.com/2018/12/abusando-de-telegram-para-conseguir-una.html"}, {"source": "cve@mitre.org", "tags": ["Exploit", "Third Party Advisory"], "url": "https://misteralfa-hack.blogspot.com/2018/12/telegram-siempre-in-middle.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Third Party Advisory"], "url": "https://misteralfa-hack.blogspot.com/2018/12/abusando-de-telegram-para-conseguir-una.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Third Party Advisory"], "url": "https://misteralfa-hack.blogspot.com/2018/12/telegram-siempre-in-middle.html"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-918"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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