Vulnerability in Telegram's Secret Chat Feature Affects Multiple Products
CVE-2018-20436

8.1HIGH

Key Information:

Vendor: Telegram
Status: Web; Telegram
Vendor: CVE Published:; 24 December 2018

What is CVE-2018-20436?

The secret chat functionality in Telegram versions such as 4.9.1 for Android exhibits a significant security issue where Telegram servers make GET requests to URLs entered while composing messages. This behavior can inadvertently lead to sensitive data exposure if certain settings are misconfigured. It resembles a Server-Side Request Forgery (SSRF) issue, which allows attackers to exploit the behavior of the application by manipulating input URLs. This flaw could also extend to other products within the Telegram ecosystem, raising concerns over user privacy and data protection.

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