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CVE-2023-1775

Unsanitized events sent over Websocket to regular users in a High Availability environment

MEDIUM
6.5
CVSS Score
Published: March 31, 2023 at 11:26 AM UTC
Updated: June 17, 2026 at 05:28 AM UTC
2 products affected across 1 vendorMattermost ServerMattermost

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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

Description

When running in a High Availability configuration, Mattermost fails to sanitize some of the user_updated and post_deleted events broadcast to all users, leading to disclosure of sensitive information to some of the users with currently connected Websocket clients.

Affected

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

Mattermost Server· Mattermost
95%
v < 7.1.67.7.1
Affected range stops below 7.1.6, so it looks safe — our inference, not a vendor statement
Mattermost· Mattermost
60%
3.3.0 ≤ v ≤ 7.1.53.3.0 ≤ v ≤ 7.7.13.3.0 ≤ v < 7.8.03.3.0
Vendor states this is fixed in 7.1.6 (unaffected)
Vendor states this is fixed in 7.7.2 (unaffected)
Vendor states this is fixed in 7.8.0 (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

6.5MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-200CWE-668

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