CVE-2024-33905Public exploitNetwork attack vector

Session hijacking via unisolated JavaScript URL opening

Published Apr 29, 2024 · Updated Aug 2, 2024

Cross-site scripting in Telegram Web K before 2.0.0 (488) allows remote authenticated users to execute JavaScript via a malicious Mini App. The web_app_open_link handler passes a postMessage-supplied javascript: URL to window.open without isolating the new window from its parent context. A victim must open the attacker's Mini App and interact with it; successful exploitation runs code in web.telegram.org and exposes the active session.

CVSS severity4.6
Medium
EPSS probability0.93%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Cross-site scripting in Telegram Web K before 2.0.0 (488) allows remote authenticated users to execute JavaScript via a malicious Mini App. The web_app_open_link handler passes a postMessage-supplied javascript: URL to window.open without isolating the new window from its parent context. A victim must open the attacker's Mini App and interact with it; successful exploitation runs code in web.telegram.org and exposes the active session.

The record

CVE
CVE-2024-33905
Published
Apr 29, 2024
Updated
Aug 2, 2024
Vendor
Morethanwords
Product
Telegram Web K
Classifications
CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 29, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=- <vite_build_488

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Morethanwords · Telegram Web Kversion=- <vite_build_488

Published CVSS scores

4.6CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo