TI-2024-01756 Aliases CVE-2024-1887 GHSA-fx48-xv6q-6gp3

Public channel post content accessible without membership when compliance export is enabled

LOW 20CWE-284Published 2024-02-29 · Updated 2024-08-07

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: None · Low · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-284.

Summary

Mattermost fails to check if compliance export is enabled when fetching posts of public channels allowing a user that is not a member of the public channel to fetch the posts, which will not be audited in the compliance export.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00331 26th percentileScored 2026-11-07

Fix Fixed Mattermost (Mattermost): 9.4.0, 9.3.1, 9.2.5 +1github.com/mattermost/mattermost/server/v8 (Go): 9.3.1, 9.2.5, 8.1.9

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Mattermost	Mattermost	up to 8.1.8; up to 9.2.4; up to 9.3.0	9.4.0, 9.3.1, 9.2.5, 8.1.9	Patch available	CNA
—	github.com/mattermost/mattermost/server/v8 (Go)	9.3.0 to before 9.3.1	9.3.1	Patch available	GHSA-fx48-xv6q-6gp3
—	github.com/mattermost/mattermost/server/v8 (Go)	9.2.0 to before 9.2.5	9.2.5	Patch available	GHSA-fx48-xv6q-6gp3
—	github.com/mattermost/mattermost/server/v8 (Go)	before 8.1.9	8.1.9	Patch available	GHSA-fx48-xv6q-6gp3

Mattermost VendorMattermost Affected up to 8.1.8; up to 9.2.4; up to 9.3.0 Fixed in 9.4.0, 9.3.1, 9.2.5, 8.1.9 Patch available CNA
github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 9.3.0 to before 9.3.1 Fixed in 9.3.1 Patch available GHSA-fx48-xv6q-6gp3
github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 9.2.0 to before 9.2.5 Fixed in 9.2.5 Patch available GHSA-fx48-xv6q-6gp3
github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected before 8.1.9 Fixed in 8.1.9 Patch available GHSA-fx48-xv6q-6gp3

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:mattermost:mattermost_server::::::::	before 8.1.9; 9.2.0 to before 9.2.5; 9.3.0 to before 9.3.1	Vulnerable	Mattermost

cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* Versions before 8.1.9; 9.2.0 to before 9.2.5; 9.3.0 to before 9.3.1 Vulnerable ·Mattermost

Remediation

Fix · CNA Mattermost (Mattermost) Fixed in 9.4.0, 9.3.1, 9.2.5, 8.1.9
Fix · GHSA-fx48-xv6q-6gp3 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 9.3.1 Advisory →
Fix · GHSA-fx48-xv6q-6gp3 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 9.2.5 Advisory →
Fix · GHSA-fx48-xv6q-6gp3 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 8.1.9 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2024-1887
2026-10-03 Alias added: GHSA-fx48-xv6q-6gp3

References

Advisory 2

Other 1

https://github.com/mattermost/mattermost

TI-2025-18933 Arbitrary file read in Mattermost Boards via import & export board archive CVSS 3.1CRITICAL 9.9
TI-2025-04465 Path Traversal Leading to RCE by Any Authenticated Mattermost User CVSS 3.1CRITICAL 9.9
TI-2017-14068 An issue was discovered in Mattermost Server before 3.6.2. CVSS 3.1CRITICAL 9.8
TI-2017-14060 An issue was discovered in Mattermost Server before 3.8.2, 3.7.5, and 3.6.7. CVSS 3.1CRITICAL 9.8
TI-2017-14048 An issue was discovered in Mattermost Server before 4.1.0, 4.0.4, and 3.10.3. CVSS 3.1CRITICAL 9.8
TI-2025-14360 Arbitrary file read via block duplication in Mattermost Boards CVSS 3.1CRITICAL 9.9

See all 505 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences