App Framework does not checks for the secret provided in the incoming webhook request

published 2023-06-16 3 y ago modified 2026-06-17 4 mo ago also GHSA-455c-vqrf-mghr , EUVD-2023-1677

cvss: 4.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 38%
public exploits: 0; none known

Mattermost Apps Framework fails to verify that a secret provided in the incoming webhook request allowing an attacker to modify the contents of the post sent by the Apps.

Patch / fix

fixed in 2

go github.com/mattermost/mattermost-server/v6 6.0.0-20230511130429-1629a6ca7fed, 7.8.5, 7.9.4, 7.10.1
Mattermost Mattermost App Framework 7.8.5, 7.9.4, 7.10.1

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 23 mo ago (2024-12-06)

Exploit prediction

0.44% chance of exploitation in the next 30 days, higher than 38% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	4.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
NVD	3.1	4.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
GitHub	3.1	4.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
go	github.com/mattermost/mattermost-server/v6	>=7.10.0, <7.10.1 >=7.9.0, <7.9.4 >=6.0.0, <7.8.5 <6.0.0-20230511130429-1629a6ca7fed	7.10.1 7.9.4 7.8.5 6.0.0-20230511130429-1629a6ca7fed

Affected products

Mattermost Mattermost App Framework

Classification

Weakness

CWE-862 Missing Authorization

References

mattermost.com /security-updates
web, vendor-advisory
nvd.nist.gov /vuln/detail/CVE-2023-2783
advisory
github.com /mattermost/mattermost-server
package

Sources

CVE List CVE-2023-2783
GitHub Advisory GHSA-455c-vqrf-mghr
NVD CVE-2023-2783

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary