CVE-2023-2808CWE-20

Lack of URL normalization allows rendering previews for disallowed domains

Medium · published May 29, 2023

CVSS v3.1
4.3
EPSS
0%
Percentile
34.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00408 · 34.0th percentile
Weakness
CWE-20 · Improper Input Validation
Published
2023-05-29T09:07Z
EPSS history
Timeline
  • 29 MAY 09:07Z
    Lack of URL normalization allows rendering previews for disallowed domains
    cvelistv5