CVE-2018-20436

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

Score

CVSS 3.0 8.1 High

Status

Modified - cve@mitre.org

Published

2018-12-24

Last modified

2024-08-05

Weaknesses

CWE-918

Affected products

• Telegram (Telegram)
• Web (Telegram)

References

• https://misteralfa-hack.blogspot.com/2018/12/abusando-de-telegram-para-conseguir-una.html
• https://misteralfa-hack.blogspot.com/2018/12/telegram-siempre-in-middle.html