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CVE-2023-2808

Lack of URL normalization allows rendering previews for disallowed domains

Medium4.3EPSS 0.41%
Published
Updated
Reserved
Assigned by
Mattermost

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.

Scores

CVSS scores of CVE-2023-2808, by who scored it
Scored byCVSSScoreVector
MattermostCNA (assigner)3.1Medium4.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
NVDNVD · Modified3.1Medium5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
EPSS (exploitation in 30 days)
0.41% · top 65% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.3.

Weakness

Affected products

  • Mattermost · Mattermost

    • affected < 7.1.9
    • affected < 7.8.4
    • affected < 7.9.3
    • unaffected 7.1.9
    • unaffected 7.8.4
    • unaffected 7.9.3
    • unaffected 7.10

What to do

Solution: Update Mattermost to version v7.1.9, v7.8.4, v7.9.3, v7.10, or higher.

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

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Record last updated .