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CVE-2023-5967

Denial of Service via crashing the Calls Plugin

MEDIUM
4.3
CVSS Score
Published: November 6, 2023 at 03:24 PM UTC
Updated: June 17, 2026 at 06:49 AM UTC
1 product affected across 1 vendorMattermost

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Severity
MEDIUM4.3
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

Description

Mattermost fails to properly validate requests to the Calls plugin, allowing an attacker sending a request without a User Agent header to cause a panic and crash the Calls plugin

Affected

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

Mattermost· Mattermost
95%
v ≤ 7.8.11v ≤ 8.0.3v ≤ 8.1.28.0.0 ≤ v ≤ 8.0.38.1.0 ≤ v ≤ 8.1.2
Vendor states this is fixed in 7.8.12 (unaffected)
Vendor states this is fixed in 8.0.4 (unaffected)
Vendor states this is fixed in 8.1.3 (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

4.3MEDIUMMattermost
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-754

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