Mattermost race condition

published 2024-02-29 2 y ago modified 2026-09-10 1 mo ago also BIT-mattermost-2024-1949 , EUVD-2024-0484 , GHSA-3g35-v53r-gpxc , GO-2024-2588

cvss: 2.6; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 18%
public exploits: 0; none known

A race condition in Mattermost versions 8.1.x before 8.1.9, and 9.4.x before 9.4.2 allows an authenticated attacker to gain unauthorized access to individual posts' contents via carefully timed post creation while another user deletes posts.

Patch / fix

fixed in 4

go github.com/mattermost/mattermost/server/v8 8.1.9, 9.4.2
bitnami mattermost 8.1.9, 9.4.2
go github.com/mattermost/mattermost-server 9.4.2+incompatible
Mattermost Mattermost 8.1.9, 9.4.2, 9.5

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 2 y ago (2024-02-29)

Exploit prediction

0.27% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	2.6	CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N
GitHub	3.1	2.6	CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N
NVD	3.1	2.6	CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N
OSV	3.1	2.6	CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N

Affected packages

ecosystem	package	affected	fixed in
go	github.com/mattermost/mattermost/server/v8	>=9.0.0, <9.4.2 <8.1.9 all versions	9.4.2 8.1.9
bitnami	mattermost	>=8.1.0, <8.1.9 >=9.4.0, <9.4.2	8.1.9 9.4.2
go	github.com/mattermost/mattermost-server	>=9.0.0+incompatible, <9.4.2+incompatible	9.4.2+incompatible
go	github.com/mattermost/mattermost-server/v5	all versions	no fix listed
go	github.com/mattermost/mattermost-server/v6	all versions	no fix listed

Affected products

Mattermost Mattermost

Classification

Weakness

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization

References

mattermost.com /security-updates
web, vendor-advisory
nvd.nist.gov /vuln/detail/CVE-2024-1949
advisory, web
github.com /mattermost/mattermost
package
pkg.go.dev /vuln/GO-2024-2588
web
github.com /advisories/GHSA-3g35-v53r-gpxc
advisory

Sources

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