CVE-2024-39836

Munged email address used for password resets and notifications

MEDIUM
6.5
CVSS Score
Published: August 22, 2024 at 06:27 AM UTC
Updated: June 17, 2026 at 07:42 AM UTC
1 product affected across 1 vendorMattermost

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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

Description

Mattermost versions 9.9.x <= 9.9.1, 9.5.x <= 9.5.7, 9.10.x <= 9.10.0 and 9.8.x <= 9.8.2 fail to ensure that remote/synthetic users cannot create sessions or reset passwords, which allows the munged email addresses, created by shared channels, to be used to receive email notifications and to reset passwords, when they are valid, functional emails.

Affected

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

9.10.0 ≤ v < 9.10.19.5.0 ≤ v ≤ 9.5.79.5.0 ≤ v < 9.5.89.8.0 ≤ v ≤ 9.8.29.8.0 ≤ v < 9.8.39.9.0 ≤ v ≤ 9.9.19.9.0 ≤ v < 9.9.29.10.09.5.09.8.09.9.0
Vendor states this is fixed in 9.10.1 (unaffected)
Vendor states this is fixed in 9.11.0 (unaffected)
Vendor states this is fixed in 9.5.8 (unaffected)
Vendor states this is fixed in 9.8.3 (unaffected)
Vendor states this is fixed in 9.9.2 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

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

CVSS

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

Quick Info

StatusANALYZED
CWE
CWE-693NVD-CWE-noinfo

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