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CVE-2023-2787

Collapsed Reply Threads APIs leak message contents from private channels

MEDIUM
6.5
CVSS Score
Published: June 16, 2023 at 08:55 AM UTC
Updated: June 17, 2026 at 05:53 AM UTC
1 product affected across 1 vendorMattermost

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

Description

Mattermost fails to check channel membership when accessing message threads, allowing an attacker to access arbitrary posts by using the message threads API.

Affected

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

Mattermost· Mattermost
95%
v ≤ 7.1.9v ≤ 7.8.4v ≤ 7.9.37.1.0 ≤ v ≤ 7.1.97.8.0 ≤ v ≤ 7.8.47.9.0 ≤ v ≤ 7.9.37.10.0
Vendor states this is fixed in 7.1.9 (unaffected)
Vendor states this is fixed in 7.10.1 (unaffected)
Vendor states this is fixed in 7.8.4 (unaffected)
Vendor states this is fixed in 7.9.3 (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

6.5MEDIUMMattermost
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-862

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