CVE-2023-2808 | BDVDB-2026-203407 Detail

MattermostMattermost

Description#

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.

Impact#

Per CVSS v3.1: confidentiality impact none, integrity impact low, availability impact none. Attack vector: network.

Weaknesses#

CWE-20 Improper Input Validation

References#

https://mattermost.com/security-updates/

Exploit#

No public exploit known

History#

Version 12023-05-29Record published in the CVE List.
Version 22024-12-06Most recent update recorded in the CVE List.

Published

Published: 2023-05-29
Last modified: 2024-12-06

Vendor information

Vendor: Mattermost
Product: Mattermost

All Mattermost vulnerabilities

Score

4.3 Medium

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 35.4.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Improper Input Validation

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
< 7.1.9
Fixed
7.1.9
Vulnerable
< 7.8.4
Fixed
7.8.4
Vulnerable
< 7.9.3
Fixed
7.9.3
Vulnerable
Not stated
Fixed
7.1.9
Vulnerable
Not stated
Fixed
7.8.4
Vulnerable
Not stated
Fixed
7.9.3
Vulnerable
Not stated
Fixed
7.10

Scoring System

CVSS v4.0

Not available

CVSS v3.1

4.3 Medium

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Privileges Required	Low
User Interaction	None
Scope	Unchanged
Confidentiality	None
Integrity	Low
Availability	None

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).