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CVE-2023-3613

Guest accounts invited and added to channels by Welcomebot plugin

LOW
3.5
CVSS Score
Published: July 17, 2023 at 03:31 PM UTC
Updated: June 17, 2026 at 06:14 AM UTC
1 product affected across 1 vendorMattermost Server

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Severity
LOW3.5
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

Description

Mattermost WelcomeBot plugin fails to to validate the membership status when inviting or adding users to channels allowing guest accounts to be added or invited to channels by default.

Affected

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

Mattermost Server· Mattermost
95%
v ≤ 7.10.2v ≤ 7.8.5v < 7.8.67.9.0 ≤ v < 7.10.3
Vendor states this is fixed in 7.10.3 (unaffected)
Vendor states this is fixed in 7.8.6 (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

3.5LOWMattermost
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-863

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