cve.bz

CVE-2023-40703

7.5 highEPSS 0.7%

High (7.5) in mattermost mattermost. EPSS 0.7% chance of exploitation in the next 30 days. Fixed in github.com/mattermost/mattermost/server/v8 8.1.4, 9.0.2, 9.1.1.

Mattermost fails to properly limit the characters allowed in different fields of a block in Mattermost Boards allowing a attacker to consume excessive resources, possibly leading to Denial of Service, by patching the field of a block using a specially crafted string.

Severity

CVSS 3.1

7.5 high
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
0.7% chance of exploitation in the next 30 days; higher than 54% of CVEs (scores of 2026-10-31)
CWE
CWE-400
Published
Modified
Record from
the NVD, synced

Affected

Packages (OSV)

AdvisoryEcosystemPackageAffectedFixed in
GHSA-c37r-v8jx-7cv2Gogithub.com/mattermost/mattermost/server/v8>=9.1.0 <9.1.19.1.1
GHSA-c37r-v8jx-7cv2Gogithub.com/mattermost/mattermost/server/v8>=9.0.0 <9.0.29.0.2
GHSA-c37r-v8jx-7cv2Gogithub.com/mattermost/mattermost/server/v8<8.1.48.1.4
GHSA-c37r-v8jx-7cv2Gogithub.com/mattermost/mattermost-server/v6<7.8.137.8.13

References

Check your stackJSON