CVE-2023-3581
WebSockets accept connections from HTTPS origin
HIGH
8.1
CVSS Score
Published: July 17, 2023 at 03:20 PM UTC
Updated: June 17, 2026 at 06:14 AM UTC
2 products affected across 1 vendorMattermost ServerMattermost
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Severity
HIGH8.1
Exploit prediction
EPSS 0.3%
SSVC
No known exploit
Description
Mattermost fails to properly validate the origin of a websocket connection allowing a MITM attacker on Mattermost to access the websocket APIs.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
7.10.0 ≤ v < 7.10.37.8.0 ≤ v < 7.8.77.9.0 ≤ v < 7.9.5
Affected range stops below 7.10.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.8.7, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.9.5, so it looks safe — our inference, not a vendor statement
v ≤ 7.10.2v ≤ 7.8.6v ≤ 7.9.4
Vendor states this is fixed in 7.10.3 (unaffected)
Vendor states this is fixed in 7.8.7 (unaffected)
Vendor states this is fixed in 7.9.5 (unaffected)
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (1)
SSVC — Action Prioritization
SSVCNo known exploitNot automatableTotal impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
- Attack Vector
- NETWORK
- Complexity
- HIGH
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- HIGH
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-346
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