CVE-2020-5263
Information disclosure through error object
CVE-2020-5263 is a medium vulnerability (CVSS 5.5) in Auth0 Auth0.js, published April 9, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.87%, the 58th percentile. Fixed in auth0-js 9.13.2.
auth0.js (NPM package auth0-js) greater than version 8.0.0 and before version 9.12.3 has a vulnerability. In the case of an (authentication) error, the error object returned by the library contains the original request of the user, which may include the plaintext password the user entered. If the error object is exposed or logged without modification, the application risks password exposure. This is fixed in version 9.12.3
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- High
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Information disclosure through error object
auth0.js (NPM package auth0-js) greater than version 8.0.0 and before version 9.12.3 has a vulnerability. In the case of an (authentication) error, the error object returned by the library contains the original request of the user, which may include the plaintext password the user entered. If the error object is exposed or logged without modification, the application risks password exposure. This is fixed in version 9.12.3
- Record
CVE-2020-5263- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:H/I:N/A:N - Weakness
- CWE-522
- Updated
- 2026-11-02
EUVDEUVD-2020-0389
auth0.js (NPM package auth0-js) greater than version 8.0.0 and before version 9.12.3 has a vulnerability. In the case of an (authentication) error, the error object returned by the library contains the original request of the user, which may include the plaintext password the user entered. If the error object is exposed or logged without modification, the application risks password exposure. This is fixed in version 9.12.3
- Record
EUVD-2020-0389- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:H/I:N/A:N - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-prfq-f66g-43mp
Information disclosure through error object in auth0.js
Overview
Between versions 8.0.0 and 9.13.1(inclusive), in the case of an (authentication) error, the error object returned by the library contains the original request of the user, which may include the plaintext password the user entered.
If the error object is exposed or logged without modification, the application risks password exposure.
Am I affected?
You are affected by this vulnerability if all of the following conditions apply:
- You are using Auth0.js version between 8.0.0 and 9.13.1(inclusive).
- You store or display error objects without filtering.
How to fix that?
Developers should upgrade auth0.js to version 9.13.2 or later where user inputted passwords are masked in errors. If upgrading is not possible, a temporary fix may include not storing the error object or displaying it publicly without modification.
Will this update impact my users?
This fix patches the Auth0.js and may require changes in application code due to password no longer available in error object, but it will not impact your users, their current state, or any existing sessions.
- Record
GHSA-prfq-f66g-43mp- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:H/I:N/A:N - Weakness
- CWE-522
- Updated
- 2026-11-02
NVD
auth0.js (NPM package auth0-js) greater than version 8.0.0 and before version 9.12.3 has a vulnerability. In the case of an (authentication) error, the error object returned by the library contains the original request of the user, which may include the plaintext password the user entered. If the error object is exposed or logged without modification, the application risks password exposure. This is fixed in version 9.12.3
- Record
CVE-2020-5263- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:H/I:N/A:N - CVSS 3.1
- 4.9 Medium
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N - CVSS 2.0
- 4.0 Medium
AV:N/AC:L/Au:S/C:P/I:N/A:N - Weakness
- CWE-522
- Updated
- 2026-11-02
OSV
auth0.js (NPM package auth0-js) greater than version 8.0.0 and before version 9.12.3 has a vulnerability. In the case of an (authentication) error, the error object returned by the library contains the original request of the user, which may include the plaintext password the user entered. If the error object is exposed or logged without modification, the application risks password exposure. This is fixed in version 9.12.3
- Record
CVE-2020-5263- CVSS 3.1
- 4.9 Medium
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-02
OSVGHSA-prfq-f66g-43mp
Information disclosure through error object in auth0.js
Overview
Between versions 8.0.0 and 9.13.1(inclusive), in the case of an (authentication) error, the error object returned by the library contains the original request of the user, which may include the plaintext password the user entered.
If the error object is exposed or logged without modification, the application risks password exposure.
Am I affected?
You are affected by this vulnerability if all of the following conditions apply:
- You are using Auth0.js version between 8.0.0 and 9.13.1(inclusive).
- You store or display error objects without filtering.
How to fix that?
Developers should upgrade auth0.js to version 9.13.2 or later where user inputted passwords are masked in errors. If upgrading is not possible, a temporary fix may include not storing the error object or displaying it publicly without modification.
Will this update impact my users?
This fix patches the Auth0.js and may require changes in application code due to password no longer available in error object, but it will not impact your users, their current state, or any existing sessions.
- Record
GHSA-prfq-f66g-43mp- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:H/I:N/A:N - Weakness
- CWE-522
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
auth0-jsnpm |
8.0.0 up to 9.13.2 | 9.13.2 |
History
| When | Changed | Sources |
|---|---|---|
| 2026-11-03 | aliases | EUVD |
| 2026-11-02 | created | CVE List, GitHub Advisories, NVD, OSV |