CVE-2021-21416

Sensitive data disclosure via unfiltered registration errors

Published Apr 1, 2021 · Updated Aug 3, 2024

Information disclosure in James Bennett django-registration before 3.1.2 allows attackers to place registration data in error reports. The base RegistrationView lacks Django's sensitive_post_parameters decorator, leaving the complete request body unfiltered when a server-side error generates a detailed report. Detailed reporting and an HTTP 5xx error during registration are required; report recipients can read submitted data, including proposed credentials.

CVSS severity2.6
Low
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in James Bennett django-registration before 3.1.2 allows attackers to place registration data in error reports. The base RegistrationView lacks Django's sensitive_post_parameters decorator, leaving the complete request body unfiltered when a server-side error generates a detailed report. Detailed reporting and an HTTP 5xx error during registration are required; report recipients can read submitted data, including proposed credentials.

The record

CVE
CVE-2021-21416
Published
Apr 1, 2021
Updated
Aug 3, 2024
Vendor
James Bennett
Product
django-registration
Classifications
CWE-209, CWE-201
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Apr 1, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=< 3.1.2

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

James Bennett · django-registrationversion=< 3.1.2

Published CVSS scores

3.5NIST NVDAV:N/AC:M/Au:S/C:P/I:N/A:N
3.7GitHubCVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:C/C:L/I:L/A:N
2.6NIST NVDCVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:N/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)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-209Generation of Error Message Containing Sensitive Information
CWE-201Insertion of Sensitive Information Into Sent Data

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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