CVE-2018-1000519: Aio-Libs Aiohttp Session

Medium severity, CVSS 6.5. EPSS: 1.2% chance of exploitation in the next 30 days.

aio-libs aiohttp-session contains a Session Fixation vulnerability in load_session function for RedisStorage (see: https://github.com/aio-libs/aiohttp-session/blob/master/aiohttp_session/redis_storage.py#L42) that can result in Session Hijacking. This attack appear to be exploitable via Any method that allows setting session cookies (?session=<>, or meta tags or script tags with Set-Cookie).

Affected products

• Aio-Libs Aiohttp Session: before 2.4.0 (fixed in 2.4.0)

Published 2018-06-26. Last modified 2026-06-17.