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CVE Record

CVE-2018-1000519: aio-libs aiohttp-session contains a Session Fixation vulnerability in load_session function for RedisStorag...

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).

UnknownCVSS not scoredNot KEV-listedUpdated
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Security readout for executives and security teams

Plain-English summary

This CVE describes a session fixation flaw in aio-libs aiohttp-session when using RedisStorage. If an attacker can cause a victim to use an attacker-chosen session cookie, the victim’s session may later be hijacked. The source bundle does not identify affected versions, CVSS score, or a confirmed fix.

Executive priority

Treat as a targeted application risk rather than a confirmed internet-wide emergency. Prioritize systems using aiohttp-session RedisStorage for authentication or privileged workflows, especially public-facing services. Lack of version and fix detail means validation should start with dependency inventory and vendor review.

Technical view

The reported issue is in aiohttp-session RedisStorage load_session behavior. The CVE states attacker-controlled session cookies may be accepted, leading to session hijacking. Exploitability depends on whether the application has a path that lets untrusted input influence session cookies. Version range, patch status, and CWE mapping are not provided.

Likely exposure

Exposure is most likely in Python aiohttp applications using aiohttp-session with RedisStorage. The bundle does not list affected versions or package constraints, so teams need local dependency inventory and vendor guidance to determine whether a specific deployment is affected.

Exploitation context

The CVE says exploitation requires a way to set a victim’s session cookie through application behavior or client-side content. There is no KEV listing and no cited evidence of active exploitation in the provided sources.

Researcher notes

The public record is sparse: no CVSS, no CWE, no affected version range, and no patch reference in the bundle. Analysis should stay anchored to RedisStorage load_session behavior and the GitHub issue. Do not assume other aiohttp-session storage backends are affected without source evidence.

Mitigation direction

  • Check aiohttp-session vendor guidance and upgrade if a fixed release is identified.
  • Regenerate session identifiers after login and privilege changes.
  • Prevent untrusted input from influencing session cookies or response cookie headers.
  • Harden session cookie settings such as Secure, HttpOnly, and SameSite where supported.
  • Review Redis-backed session handling for acceptance of unknown or attacker-supplied IDs.

Validation and detection

  • Inventory applications using aiohttp-session with RedisStorage.
  • Identify installed aiohttp-session versions and compare against vendor issue guidance.
  • Review authentication flows for session ID regeneration after successful login.
  • Assess whether reflected content or response logic can influence session cookies.
  • Check logs for unusual session reuse across different users or clients.
Prepared
Confidence
medium
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

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