CVE-2023-40171Network attack vector

Account takeover via JWT-secret error disclosure

Published Aug 17, 2023 · Updated Oct 7, 2024

Sensitive-data exposure in Netflix Dispatch before 20230817 allows remote attackers to take over accounts through malformed JWTs. The Basic Authentication Provider passes JWT decode exception text into an HTTP 401 response, and that text can contain DISPATCH_JWT_SECRET. The flaw is remotely reachable without authentication only when the instance uses that provider; the disclosed secret signs attacker-crafted JWTs for any account.

CVSS severity9.1
Critical
EPSS probability0.94%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sensitive-data exposure in Netflix Dispatch before 20230817 allows remote attackers to take over accounts through malformed JWTs. The Basic Authentication Provider passes JWT decode exception text into an HTTP 401 response, and that text can contain DISPATCH_JWT_SECRET. The flaw is remotely reachable without authentication only when the instance uses that provider; the disclosed secret signs attacker-crafted JWTs for any account.

The record

CVE
CVE-2023-40171
Published
Aug 17, 2023
Updated
Oct 7, 2024
Vendor
Netflix
Product
Dispatch
Classifications
CWE-209, T1552, T1078
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 17, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 7, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 20230817

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Netflix · Dispatchversion=< 20230817

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
9.1GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-209Generation of Error Message Containing Sensitive Information
T1552Unsecured Credentials
T1078Valid Accounts

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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