CVE-2018-1000519

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2018-06-26 · updated 2026-06-17
Weakness: CWE-384

Description

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

How to fix

Upgrade to a fixed version: aio-libs Aiohttp Session 2.4.0. Check the vendor advisory for mitigations.

References

https://github.com/aio-libs/aiohttp-session/blob/master/aiohttp_session/redis_storage.py#L60
https://github.com/aio-libs/aiohttp-session/issues/272
https://github.com/aio-libs/aiohttp-session/blob/master/aiohttp_session/redis_storage.py#L60
https://github.com/aio-libs/aiohttp-session/issues/272

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