Bypass of "Max failed attempts" restriction via race condition

published 2024-12-16 22 mo ago modified 2026-06-17 4 mo ago also GHSA-826h-p4c3-477p , GO-2024-3338 , EUVD-2024-3530

cvss: 4.8; 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 17%
public exploits: 0; none known

Mattermost versions 10.1.x <= 10.1.2, 10.0.x <= 10.0.2, 9.11.x <= 9.11.4, and 9.5.x <= 9.5.12 fail to prevent concurrently checking and updating the failed login attempts. which allows an attacker to bypass of "Max failed attempts" restriction and send a big number of login attempts before being blocked via simultaneously sending multiple login requests

Patch / fix

fixed in 3 distros 1

go github.com/mattermost/mattermost/server/v8 9.5.13, 9.11.5, 10.0.3, 10.1.3
go github.com/mattermost/mattermost-server 9.5.13+incompatible, 9.11.5+incompatible, 10.0.3+incompatible, 10.1.3+incompatible
Mattermost Mattermost 9.5.13, 9.11.5, 10.0.3, 10.1.3, 10.2.0

govulncheck-vulndb openSUSE Tumbleweed 0.0.20241218T202206-1.1

opensuse advisories openSUSE-SU-2024:14603-1

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 22 mo ago (2024-12-16)

Exploit prediction

0.26% chance of exploitation in the next 30 days, higher than 17% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	4.8	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
GitHub	3.1	4.8	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
go	github.com/mattermost/mattermost/server/v8	>=10.1.0, <10.1.3 >=10.0.0, <10.0.3 >=9.11.0, <9.11.5 >=9.5.0, <9.5.13 all versions	10.1.3 10.0.3 9.11.5 9.5.13
go	github.com/mattermost/mattermost-server	>=9.5.0+incompatible, <9.5.13+incompatible >=9.11.0+incompatible, <9.11.5+incompatible >=10.0.0+incompatible, <10.0.3+incompatible >=10.1.0+incompatible, <10.1.3+incompatible	9.5.13+incompatible 9.11.5+incompatible 10.0.3+incompatible 10.1.3+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-362 Concurrent Execution using Shared Resource with Improper Synchronization

References

mattermost.com /security-updates
web, vendor-advisory
nvd.nist.gov /vuln/detail/CVE-2024-48872
advisory
github.com /mattermost/mattermost
package
github.com /advisories/GHSA-826h-p4c3-477p
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