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AWS appstream2 medium security documentation change

Service: appstream2 · 2026-07-01 · Security-related medium

File: appstream2/latest/developerguide/getting-started-agent-access.md

Summary

Added concurrency limitation note restricting multiple agents per session and per user-fleet combination

Security assessment

Explicitly documents session isolation controls preventing concurrent access, which directly addresses session hijacking/confusion risks by enforcing one-agent-per-session rule

Diff

diff --git a/appstream2/latest/developerguide/getting-started-agent-access.md b/appstream2/latest/developerguide/getting-started-agent-access.md
index c99581eb7..57fdcb53f 100644
--- a//appstream2/latest/developerguide/getting-started-agent-access.md
+++ b//appstream2/latest/developerguide/getting-started-agent-access.md
@@ -221,0 +222,4 @@ The response includes a `StreamingURL` that you pass to your agent in the next s
+###### Note
+
+At any given time, only one agent can connect to a unique session. Named users, specified through the `UserId` parameter, can have only one active session per fleet at a time. To run multiple agents concurrently, each agent must connect to its own unique session.
+