Vulnerability · Published Sep 21, 2026 · Assigned by GitHub_M

CVE-2026-62247Supabase Realtime: Incorrect Authorization

Medium 6.5

In plain English

A medium-severity incorrect authorization in realtime from supabase. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 39% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.5%top 60.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Supabase Realtime provides Broadcast, Presence, and Postgres Changes via WebSockets. Prior to 2.111.2, Realtime authorization does not correctly honor the per-extension presence.read row-level security policy when a private-channel client is allowed presence.write but explicitly denied presence.read. Under that differential policy, the client can receive presence_diff messages containing other members' presence metadata, including application-defined location, online-status, roster, viewing, or typing information. Deployments with uniform presence visibility have no differential, and postgres_changes row data is unaffected. This issue is fixed in version 2.111.2.

Affected products (as reported)

Vendor	Product	Versions
supabase	realtime	< 2.111.2

Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References

https://github.com/supabase/realtime/security/advisories/GHSA-rcr8-2525-4r7p x_refsource_CONFIRM
https://github.com/supabase/realtime/pull/1969 x_refsource_MISC
https://github.com/supabase/realtime/commit/c039bca9b57c2e554a67fdf462970b54641d82eb x_refsource_MISC
https://github.com/supabase/realtime/releases/tag/v2.111.2 x_refsource_MISC