CVE-2023-2808

Lack of URL normalization allows rendering previews for disallowed domains

Severity Score

5.3

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track

*SSVC

Descriptions

Mattermost fails to normalize UTF confusable characters when determining if a preview should be generated for a hyperlink, allowing an attacker to trigger link preview on a disallowed domain using a specially crafted link.

*Credits: xpx

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2023-05-19 CVE Reserved
2023-05-29 CVE Published
2024-12-06 CVE Updated
2025-04-15 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-20: Improper Input Validation

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://mattermost.com/security-updates	2023-06-05

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Mattermost Search vendor "Mattermost"		Mattermost Search vendor "Mattermost" for product "Mattermost"				>= 5.34.0 < 7.1.9 Search vendor "Mattermost" for product "Mattermost" and version " >= 5.34.0 < 7.1.9"		-		Affected
Mattermost Search vendor "Mattermost"		Mattermost Search vendor "Mattermost" for product "Mattermost"				>= 7.2.0 < 7.8.4 Search vendor "Mattermost" for product "Mattermost" and version " >= 7.2.0 < 7.8.4"		-		Affected
Mattermost Search vendor "Mattermost"		Mattermost Search vendor "Mattermost" for product "Mattermost"				>= 7.9.0 < 7.9.3 Search vendor "Mattermost" for product "Mattermost" and version " >= 7.9.0 < 7.9.3"		-		Affected