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CVE-2024-43813

IDOR when marking read a user's channel

MEDIUM
4.3
CVSS Score
Published: August 22, 2024 at 06:30 AM UTC
Updated: June 17, 2026 at 07:51 AM UTC
1 product affected across 1 vendorMattermost

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Severity
MEDIUM4.3
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

Mattermost versions 9.5.x <= 9.5.7, 9.10.x <= 9.10.0 fail to enforce proper access controls which allows any authenticated user, including guests, to mark any channel inside any team as read for any user.

Affected

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

Mattermost· Mattermost
95%
9.10.0 ≤ v < 9.10.19.5.0 ≤ v ≤ 9.5.79.5.0 ≤ v < 9.5.89.10.09.5.0
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)

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

4.3MEDIUMMattermost
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-284NVD-CWE-Other

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