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TI-2023-26132 Aliases CVE-2023-48268GHSA-j4c3-3h73-74m9

Denial of Service via Board Import Zip Bomb

Priority LOW 34CWE-400Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-400.

Summary

Mattermost fails to limit the amount of data extracted from compressed archives during board import in Mattermost Boards allowing an attacker to consume excessive resources, possibly leading to Denial of Service, by importing a board using a specially crafted zip (zip bomb).

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00723 54th percentileScored 2026-11-07
Fix Fixed Mattermost (Mattermost): 9.1.1, 9.0.2, 7.8.13 +1github.com/mattermost/mattermost/server/v8 (Go): 9.1.1, 9.0.2, 8.1.4+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

VendorProductAffected versionsFixed inStatusSource
MattermostMattermostup to 7.8.12; up to 8.1.3; up to 9.0.1; up to 9.1.09.1.1, 9.0.2, 7.8.13, 8.1.4Patch availableCNA
—github.com/mattermost/mattermost/server/v8 (Go)9.1.0 to before 9.1.19.1.1Patch availableGHSA-j4c3-3h73-74m9
—github.com/mattermost/mattermost/server/v8 (Go)9.0.0 to before 9.0.29.0.2Patch availableGHSA-j4c3-3h73-74m9
—github.com/mattermost/mattermost/server/v8 (Go)before 8.1.48.1.4Patch availableGHSA-j4c3-3h73-74m9
—github.com/mattermost/mattermost-server/v6 (Go)before 7.8.137.8.13Patch availableGHSA-j4c3-3h73-74m9
  • Mattermost VendorMattermost Affected up to 7.8.12; up to 8.1.3; up to 9.0.1; up to 9.1.0 Fixed in 9.1.1, 9.0.2, 7.8.13, 8.1.4 Patch available CNA
  • github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 9.1.0 to before 9.1.1 Fixed in 9.1.1 Patch available GHSA-j4c3-3h73-74m9
  • github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 9.0.0 to before 9.0.2 Fixed in 9.0.2 Patch available GHSA-j4c3-3h73-74m9
  • github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected before 8.1.4 Fixed in 8.1.4 Patch available GHSA-j4c3-3h73-74m9
  • github.com/mattermost/mattermost-server/v6 (Go) Vendor— Affected before 7.8.13 Fixed in 7.8.13 Patch available GHSA-j4c3-3h73-74m9

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:mattermost:mattermost:*:*:*:*:*:*:*:*up to 7.8.12; 8.0.0 – 8.1.3; 9.0.0 – 9.0.1VulnerableMattermost
cpe:2.3:a:mattermost:mattermost:9.1.0:*:*:*:*:*:*:*9.1.0VulnerableMattermost
  • cpe:2.3:a:mattermost:mattermost:*:*:*:*:*:*:*:* Versions up to 7.8.12; 8.0.0 – 8.1.3; 9.0.0 – 9.0.1 Vulnerable ·Mattermost
  • cpe:2.3:a:mattermost:mattermost:9.1.0:*:*:*:*:*:*:* Versions 9.1.0 Vulnerable ·Mattermost

Remediation

  • Fix · CNA Mattermost (Mattermost) Fixed in 9.1.1, 9.0.2, 7.8.13, 8.1.4
  • Fix · GHSA-j4c3-3h73-74m9 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 9.1.1 Advisory →
  • Fix · GHSA-j4c3-3h73-74m9 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 9.0.2 Advisory →
  • Fix · GHSA-j4c3-3h73-74m9 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 8.1.4 Advisory →
  • Fix · GHSA-j4c3-3h73-74m9 github.com/mattermost/mattermost-server/v6 (Go) Fixed in 7.8.13 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-48268
  2. 2026-10-03 Alias added: GHSA-j4c3-3h73-74m9

References

Advisory 2

Other 1

  • 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