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CVE-2024-39830

Timing attack during remote cluster token comparison when shared channels are enabled

MEDIUM
5.9
CVSS Score
Published: July 3, 2024 at 08:32 AM UTC
Updated: June 17, 2026 at 07:42 AM UTC
1 product affected across 1 vendorMattermost

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Severity
MEDIUM5.9
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

Mattermost versions 9.8.x <= 9.8.0, 9.7.x <= 9.7.4, 9.6.x <= 9.6.2 and 9.5.x <= 9.5.5, when shared channels are enabled, fail to use constant time comparison for remote cluster tokens which allows an attacker to retrieve the remote cluster token via a timing attack during remote cluster token comparison.

Affected

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

Mattermost· Mattermost
95%
9.5.0 ≤ v ≤ 9.5.59.5.0 ≤ v < 9.5.69.6.0 ≤ v ≤ 9.6.29.6.0 ≤ v < 9.6.39.7.0 ≤ v ≤ 9.7.49.7.0 ≤ v < 9.7.59.8.0 ≤ v < 9.8.19.5.09.6.09.7.09.8.0
Vendor states this is fixed in 9.5.6 (unaffected)
Vendor states this is fixed in 9.6.3 (unaffected)
Vendor states this is fixed in 9.7.5 (unaffected)
Vendor states this is fixed in 9.8.1 (unaffected)
Vendor states this is fixed in 9.9.0 (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 automatableTotal impact

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

CVSS

5.9MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-287CWE-203

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