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CVE-2023-2793

Stack exhaustion in PreparePostForClientWithEmbedsAndImages

Medium6.5EPSS 0.56%
Published
Updated
Reserved
Assigned by
Mattermost

Description

Mattermost fails to validate links on external websites when constructing a preview for a linked website, allowing an attacker to cause a denial-of-service by a linking to a specially crafted webpage in a message.

Timeline

  1. ID reserved

    By Mattermost

  2. · 29 days later

    Published

  3. · 18 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2023-2793, by who scored it
Scored byCVSSScoreVector
MattermostCNA (assigner)3.1Medium6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVDNVD · Modified3.1Medium6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.56% · top 53% of all CVEs (7 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 6.5.

Weakness

Affected products

  • Mattermost · Mattermost

    • affected ≤ 7.8.2
    • affected ≤ 7.9.1
    • unaffected 7.10.1
    • unaffected 7.8.3
    • unaffected 7.9.2
    • affected 7.10.0

What to do

Solution: Update Mattermost to version  v7.8.3, v7.9.2, 7.10.1 or higher.

References (1)

Sources

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

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Record last updated .