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Fencer Vulns
medium 5.4

CVE-2025-41410 json

Slack import bypasses email verification for team access controls

published 2025-10-16 12 mo ago modified 2026-10-19 21 d ago also GHSA-3q4q-wqm6-hvf3 , GO-2025-4029 , EUVD-2025-34742

cvss
5.4
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 24%
public exploits
0
none known

Summary

Mattermost versions 10.10.x <= 10.10.2, 10.5.x <= 10.5.10, 10.11.x <= 10.11.2 fail to validate email ownership during Slack import process which allows attackers to create verified user accounts with arbitrary email domains via malicious Slack import data to bypass email-based team access restrictions

Patch / fix

  • go github.com/mattermost/mattermost/server/v8 8.0.0-20250822083415-01b95392a450
  • go github.com/mattermost/mattermost-server 10.5.11, 10.5.11+incompatible, 10.10.3, 10.10.3+incompatible, 10.11.3, 10.11.3+incompatible
  • Mattermost Mattermost 10.5.11, 10.10.3, 10.11.3, 10.12.0
  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
  • govulncheck-vulndb openSUSE Tumbleweed 0.0.20251105T184115-1.1

opensuse advisories openSUSE-SU-2026:21483-1openSUSE-SU-2025:15710-1

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
12 mo ago

Exploit prediction

0.31% chance of exploitation in the next 30 days, higher than 24% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
GitHub 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
go github.com/mattermost/mattermost/server/v8
<8.0.0-20250822083415-01b95392a450
all versions
8.0.0-20250822083415-01b95392a450
go github.com/mattermost/mattermost-server
>=10.10.0, <10.10.3
>=10.5.0, <10.5.11
>=10.11.0, <10.11.3
>=10.5.0+incompatible, <10.5.11+incompatible
>=10.10.0+incompatible, <10.10.3+incompatible
>=10.11.0+incompatible, <10.11.3+incompatible
10.10.3
10.5.11
10.11.3
10.5.11+incompatible
10.10.3+incompatible
10.11.3+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

References

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.