CVE-2018-20436 - CVE House
Back to Database
Status published High CVE-2018-20436

The "secret chat" feature in Telegram 4.9.1 for Android has...

Vulnerability 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

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

THREAT MONITOR

Am I Vulnerable?

Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2018-20436

Credits & Attribution

No credits recorded in the NVD database.

References

More from telegram

View All →
CVE-2022-43363
Telegram Web 15.3.1 allows XSS via a certain payload derived...
Medium 6.1
CVE-2021-41861
The Telegram application 7.5.0 through 7.8.0 for Android does not...
Low 3.3
CVE-2021-40532
Telegram Web K Alpha before 0.7.2 mishandles the characters in...
Critical 9.8
CVE-2021-37596
Telegram Web K Alpha 0.6.1 allows XSS via a document...
Medium 6.1
CVE-2021-36769
A reordering issue exists in Telegram before 7.8.1 for Android,...
Medium 5.3

Affected Vendor

Affected Software

telegram, web
Vulnerable Versions:
4.9.1, 0.7.0

Timeline

Official Publish: December 24th, 2018
Last Modified: August 5th, 2024
Added to House: July 20th, 2026

CVSS Vectors

V3: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses (CWE)

No CWE data available

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.