What is CVE-2022-43363?

CVE-2022-43363 is a medium-severity vulnerability in Telegram, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2022-12-06.

How severe is CVE-2022-43363?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Telegram

CVE-2022-43363

Telegram Web 15.3.1 allows XSS via a certain payload derived from a Target Corporation website. NOTE: some third parties have been unable to discern any relationship between the Pastebin information and a possible XSS finding.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2022-12-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.004 (35.9th percentile), scored 2026-10-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 35.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000

Affected products

Telegram — versions 15.3.1

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

bugs.telegram.org/c/17831 (Product)
pastebin.com/72MRwNXW (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2022-43363?: CVE-2022-43363 is a medium-severity vulnerability in Telegram, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2022-12-06.
How severe is CVE-2022-43363?: Medium severity. CVSS v3 base score is 6.1 out of 10.