In Telegram WebK before 2.0.0 (488), a crafted Mini Web App allows XSS via the postMessage web_app_open_link event type.
Priority MEDIUM 54CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- None · Low · Low
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-79.
Summary
In Telegram WebK before 2.0.0 (488), a crafted Mini Web App allows XSS via the postMessage web_app_open_link event type.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.01066 64th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE names CISA-ADP · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:morethanwords:tweb:-:*:*:*:*:*:*:* | not specified by CISA-ADP | — | — |
- cpe:2.3:a:morethanwords:tweb:-:*:*:*:*:*:*:* Versions not specified by CISA-ADP — ·—
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2024-33905
- 2026-10-03 Alias added: GHSA-4vm2-7x6p-rxmc
References
Other 4
- https://github.com/morethanwords/tweb/commit/2153ea9878668769faac8dd5931b7e0b96a9f129/src/components/popups/webApp.ts
- https://medium.com/%40pedbap/telegram-web-app-xss-session-hijacking-1-click-95acccdc8d90
- https://www.openwall.com/lists/oss-security/2024/04/28/4
- [oss-security] 20240430 Re: Telegram Web app XSS / Session Hijacking 1-click
Sources
- CVE-2024-33905 · CVE Program
- CVE-2024-33905 · NVD
- FIRST EPSS
- GHSA-4vm2-7x6p-rxmc · GitHub Advisory Database · CC BY 4.0
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