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CVE-2023-2793

Stack exhaustion in PreparePostForClientWithEmbedsAndImages

MEDIUM
6.5
CVSS Score
Published: June 16, 2023 at 09:02 AM UTC
Updated: June 17, 2026 at 05:53 AM UTC
1 product affected across 1 vendorMattermost

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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.6%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Mattermost· Mattermost
95%
v ≤ 7.8.2v ≤ 7.9.17.8.0 ≤ v ≤ 7.8.37.9.0 ≤ v ≤ 7.9.27.10.0
Vendor states this is fixed in 7.10.1 (unaffected)
Vendor states this is fixed in 7.8.3 (unaffected)
Vendor states this is fixed in 7.9.2 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: [email protected]
https://mattermost.com/security-updates/

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUMMattermost
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-400

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