TI-2023-05498 Aliases CVE-2023-5967 GHSA-xvq6-h898-wcj8

Denial of Service via crashing the Calls Plugin

LOW 21CWE-754Published 2023-11-06 · Updated 2024-09-12

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

Mattermost fails to properly validate requests to the Calls plugin, allowing an attacker sending a request without a User Agent header to cause a panic and crash the Calls plugin

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00613 49th percentileScored 2026-11-07

Fix Fixed Mattermost (Mattermost): 8.1.3, 8.0.4, 7.8.12github.com/mattermost/mattermost-server/v6 (Go): 7.8.12+1 more product

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 8.1.2; up to 8.0.3; up to 7.8.11	8.1.3, 8.0.4, 7.8.12	Patch available	CNA
—	github.com/mattermost/mattermost-server/v6 (Go)	before 7.8.12	7.8.12	Patch available	GHSA-xvq6-h898-wcj8
—	github.com/mattermost/mattermost/server/v8 (Go)	8.0.0 to before 8.0.4	8.0.4	Patch available	GHSA-xvq6-h898-wcj8
—	github.com/mattermost/mattermost/server/v8 (Go)	8.1.0 to before 8.1.3	8.1.3	Patch available	GHSA-xvq6-h898-wcj8
—	github.com/mattermost/mattermost/server/v8 (Go)	9.0.0 to before 9.0.1	9.0.1	Patch available	GHSA-xvq6-h898-wcj8

Mattermost VendorMattermost Affected up to 8.1.2; up to 8.0.3; up to 7.8.11 Fixed in 8.1.3, 8.0.4, 7.8.12 Patch available CNA
github.com/mattermost/mattermost-server/v6 (Go) Vendor— Affected before 7.8.12 Fixed in 7.8.12 Patch available GHSA-xvq6-h898-wcj8
github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 8.0.0 to before 8.0.4 Fixed in 8.0.4 Patch available GHSA-xvq6-h898-wcj8
github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 8.1.0 to before 8.1.3 Fixed in 8.1.3 Patch available GHSA-xvq6-h898-wcj8
github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 9.0.0 to before 9.0.1 Fixed in 9.0.1 Patch available GHSA-xvq6-h898-wcj8

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:mattermost:mattermost::::::::	up to 7.8.11; 8.0.0 – 8.0.3; 8.1.0 – 8.1.2	Vulnerable	Mattermost

cpe:2.3:a:mattermost:mattermost:*:*:*:*:*:*:*:* Versions up to 7.8.11; 8.0.0 – 8.0.3; 8.1.0 – 8.1.2 Vulnerable ·Mattermost

Remediation

Fix · CNA Mattermost (Mattermost) Fixed in 8.1.3, 8.0.4, 7.8.12
Fix · GHSA-xvq6-h898-wcj8 github.com/mattermost/mattermost-server/v6 (Go) Fixed in 7.8.12 Advisory →
Fix · GHSA-xvq6-h898-wcj8 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 8.0.4 Advisory →
Fix · GHSA-xvq6-h898-wcj8 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 8.1.3 Advisory →
Fix · GHSA-xvq6-h898-wcj8 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 9.0.1 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2023-5967
2026-10-03 Alias added: GHSA-xvq6-h898-wcj8

References

Advisory 2

Other 1

https://github.com/mattermost/mattermost

TI-2024-26695 Malicious remote can invite itself to an arbitrary local channel CVSS 3.1CRITICAL 9.6
TI-2023-02056 Oauth authorization codes do not expire when deauthorizing an oauth2 app CVSS 3.1CRITICAL 9.1
TI-2019-15069 An issue was discovered in Mattermost Mobile Apps before 1.26.0. CVSS 3.1CRITICAL 9.1
TI-2024-26233 Malicious remote can add users to arbitrary teams and channels CVSS 3.1HIGH 8.7
TI-2024-26746 Permanently local data deletion by malicious remote CVSS 3.1HIGH 8.7
TI-2023-06508 Injection in Mattermost CVSS 3.1HIGH 8.8

See all 76 →

Sources

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