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CVE Record

CVE-2019-13611: An issue was discovered in python-engineio through 3.8.2.

An issue was discovered in python-engineio through 3.8.2. There is a Cross-Site WebSocket Hijacking (CSWSH) vulnerability that allows attackers to make WebSocket connections to a server by using a victim's credentials, because the Origin header is not restricted.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

Python-engineio through 3.8.2 allowed WebSocket requests without restricting the Origin header. A malicious website could potentially cause a victim's browser to open a WebSocket connection using that victim's credentials. Business urgency depends on whether affected Engine.IO WebSocket endpoints are exposed and perform authenticated actions.

Executive priority

Treat this as a targeted dependency and configuration review, not an emergency based on current evidence. Prioritize internet-facing or customer-facing applications with authenticated real-time features, especially where WebSocket actions can change data or trigger business operations.

Technical view

CVE-2019-13611 is a Cross-Site WebSocket Hijacking issue in python-engineio through 3.8.2. The reported weakness is missing Origin restriction for WebSocket connections. The public bundle does not provide CVSS, CWE, CPEs, a confirmed fixed version, or detailed exploit conditions beyond the GitHub issue reference.

Likely exposure

Exposure is likely where applications use python-engineio 3.8.2 or earlier for authenticated WebSocket or Engine.IO endpoints reachable by users' browsers. The bundle lists affected product metadata as unavailable, so teams must verify dependency usage directly.

Exploitation context

The provided sources do not show known active exploitation, and the CVE is not listed as KEV. The issue is still security-relevant because browser credentials may be reused automatically during cross-site WebSocket connection attempts.

Researcher notes

Evidence is limited to the CVE record and referenced GitHub issue. No CVSS, CWE, CPE, fix version, or exploitation evidence is provided in the bundle. Validate exact package usage, origin checks, and upstream release history before final risk acceptance.

Mitigation direction

  • Inventory applications using python-engineio and identify versions at or below 3.8.2.
  • Check upstream python-engineio guidance for the fixed version or recommended configuration.
  • Restrict allowed WebSocket Origin values to trusted application origins.
  • Review authenticated WebSocket handlers for sensitive state-changing actions.
  • Add compensating controls where upgrade timing is delayed.

Validation and detection

  • Check dependency manifests and deployed artifacts for python-engineio versions.
  • Confirm Engine.IO or WebSocket endpoints reject untrusted Origin values.
  • Review application configuration for explicit origin allowlists.
  • Verify authentication-sensitive WebSocket flows require expected session protections.
  • Document any exposed endpoints that remain on affected versions.
Prepared
Confidence
medium
Sources
3

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
2Source 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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