Vulnerability · Published Nov 27, 2023 · Assigned by Mattermost
CVE-2023-40703Denial of Service via specially crafted block fields in Mattermost Boards
Medium 4.3
In plain English
A medium-severity uncontrolled resource consumption in Mattermost from Mattermost. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)4.3Medium
Exploit odds (30 days)0.7%top 45.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/mattermost/mattermost-server/v6 | 7.8.13 | GHSA-c37r-v8jx-7cv2 |
| Go | github.com/mattermost/mattermost/server/v8 | 9.1.1 | GHSA-c37r-v8jx-7cv2 |
| Go | github.com/mattermost/mattermost/server/v8 | 9.0.2 | GHSA-c37r-v8jx-7cv2 |
| Go | github.com/mattermost/mattermost/server/v8 | 8.1.4 | GHSA-c37r-v8jx-7cv2 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mattermost | Mattermost | 0 – through 7.8.120 – through 8.1.30 – through 9.0.10 – through 9.1.0 |
Weakness: CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L