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CVE-2018-20436 Details

Description

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

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:8.1 HIGHVector:CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://misteralfa-hack.blogspot.com/2018/12/abusando-de-telegram-para-conseguir-una.html CVEExploitThird Party Advisory
https://misteralfa-hack.blogspot.com/2018/12/telegram-siempre-in-middle.html CVEExploitThird Party Advisory
https://misteralfa-hack.blogspot.com/2018/12/abusando-de-telegram-para-conseguir-una.html [email protected]ExploitThird Party Advisory
https://misteralfa-hack.blogspot.com/2018/12/telegram-siempre-in-middle.html [email protected]ExploitThird Party Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-918Server-Side Request Forgery (SSRF)[email protected]

Affected Products

ProductVersions
telegram telegram
4.9.1

CPE

  • cpe:2.3:a:telegram:telegram:4.9.1:*:*:*:*:android:*:*

Remediation

  • No remediation found in references.
telegram web
0.7.0

CPE

  • cpe:2.3:a:telegram:web:0.7.0:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

10 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2018-20436
NVD Published Date:
Dec 24, 2018
NVD Last Modified:
Jun 17, 2026
Source:
[email protected]