Research / Finding
JSON injection in Mini App custom method response enables arbitrary JavaScript execution in WebAppWebView
F-TELEGRAM-JSBRIDGE-001
Public snapshot: 26 Sep 2026. Status, releases and attribution belong to each source below; none is inferred from another record.
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Recorded evidence
—score not recorded
JSON injection in Mini App custom method response enables arbitrary JavaScript execution in WebAppWebView
fixed publicly
details
- Finding IDs
- F-TELEGRAM-JSBRIDGE-001
- Status
- fixed publicly
- Reported via
- Telegram security contact
- Note
- accepted as LOW. public fix commit 687cefb2914539e2a42d3a10e91fe4ce1c7fbf7f on 2026-02-25 serializes the custom method result through JSONSerialization before sendEvent; the fix is present in release-12.5.
F-TELEGRAM-JSBRIDGE-001: Code / markup injection. Bridge result data is interpolated into JavaScript instead of serialized. Reviewed 24 Sep 2026. Mechanism assessed by 1seal.
Mechanism source for F-TELEGRAM-JSBRIDGE-001
Security area (1seal assessment): Semantics. Bridge result data is interpolated into JavaScript instead of serialized. Reviewed 24 Sep 2026.
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