CVE-2021-37693

Re-use of email tokens in Discourse

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Discourse is an open-source platform for community discussion. In Discourse before versions 2.7.8 and 2.8.0.beta4, when adding additional email addresses to an existing account on a Discourse site an email token is generated as part of the email verification process. Deleting the additional email address does not invalidate an unused token which can then be used in other contexts, including reseting a password.

Discourse es una plataforma de código abierto para el debate comunitario. En Discourse versiones anteriores a 2.7.8 y 2.8.0.beta4, cuando se añaden direcciones de correo electrónico adicionales a una cuenta existente en un sitio de Discourse es generado un token de correo electrónico como parte del proceso de comprobación del correo electrónico. Eliminando las direcciones de correo electrónico adicionales no invalida un token no usado que puede ser usado en otros contextos, incluyendo el restablecimiento de una contraseña.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-07-29 CVE Reserved
2021-08-13 CVE Published
2024-04-28 EPSS Updated
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-613: Insufficient Session Expiration
CWE-640: Weak Password Recovery Mechanism for Forgotten Password

CAPEC

References (2)

URL	Tag	Source
https://github.com/discourse/discourse/security/advisories/GHSA-9377-96f4-cww4	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
https://github.com/discourse/discourse/commit/fb14e50741a4880cda22244eded8858e2f5336ef	2021-08-30

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Discourse Search vendor "Discourse"		Discourse Search vendor "Discourse" for product "Discourse"				< 2.7.8 Search vendor "Discourse" for product "Discourse" and version " < 2.7.8"		-		Affected
Discourse Search vendor "Discourse"		Discourse Search vendor "Discourse" for product "Discourse"				2.8.0 Search vendor "Discourse" for product "Discourse" and version "2.8.0"		beta1		Affected
Discourse Search vendor "Discourse"		Discourse Search vendor "Discourse" for product "Discourse"				2.8.0 Search vendor "Discourse" for product "Discourse" and version "2.8.0"		beta2		Affected
Discourse Search vendor "Discourse"		Discourse Search vendor "Discourse" for product "Discourse"				2.8.0 Search vendor "Discourse" for product "Discourse" and version "2.8.0"		beta3		Affected