CVE WatchOct 23, 2026

CVE-2026-54238

Supabase Realtime provides Broadcast, Presence, and Postgres Changes via WebSockets. Prior to version 2.103.1, the REST broadcast endpoints

CVSS

3.1

Low

EPSS

0.2%

p10

KEV

—

Exploit Today

0-100

Published: Oct 22, 2026 · Last modified: Oct 23, 2026 · CWE-613

EPSS · 30d

Not enough EPSS history yet.

Technical description

Supabase Realtime provides Broadcast, Presence, and Postgres Changes via WebSockets. Prior to version 2.103.1, the REST broadcast endpoints accept an expired JWT when the exp claim is encoded as a JSON string instead of a JSON number. The same route rejects an expired integer exp token signed with the same tenant secret. The accepted request returns 202 and emits the broadcast to subscribers. This could allow an unauthenticated attacker can broadcast realtime messages to subscribers. The attack can be performed via the Internet/only from within the supabase project. The impact of broadcasting messages to subscribers is application specific. This issue has been patched in version 2.103.1.

Official references

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