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Fencer Intel
medium 4.3

CVE-2026-2463 json

Unauthorized access to invite ID during team creation

published 7mo ago modified 4mo ago also GHSA-fx49-m253-27jj , GO-2026-4735 , EUVD-2026-12385

cvss
4.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 7%
public exploits
0
none known

Summary

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to filter invite IDs based on user permissions, which allows regular users to bypass access control restrictions and register unauthorized accounts via leaked invite IDs during team creation.. Mattermost Advisory ID: MMSA-2025-00565

Patch / fix

  • go github.com/mattermost/mattermost/server/v8 8.0.0-20260105134819-cc427af41b2a
  • go github.com/mattermost/mattermost-server 5.3.2-0.20260105134819-cc427af41b2a, 10.11.11, 10.11.11+incompatible, 11.2.3, 11.2.3+incompatible, 11.3.1, 11.3.1+incompatible
  • Mattermost Mattermost 10.11.11, 11.2.3, 11.3.1, 11.4.0
  • govulncheck-vulndb openSUSE Leap 15.6 0.0.20260326T203309-150000.1.155.2

suse advisories SUSE-SU-2026:1135-1

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1

opensuse advisories openSUSE-SU-2026:21483-1

Is CVE-2026-2463 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
7mo ago

Exploit prediction

0.18% chance of exploitation in the next 30 days, higher than 7% of all scored CVEs (FIRST EPSS, 2026-11-09).

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:L/I:N/A:N
GitHub 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem package affected fixed in
go github.com/mattermost/mattermost/server/v8
<8.0.0-20260105134819-cc427af41b2a
8.0.0-20260105134819-cc427af41b2a
go github.com/mattermost/mattermost-server
<5.3.2-0.20260105134819-cc427af41b2a
>=10.11.0-rc1, <10.11.11
>=11.2.0-rc1, <11.2.3
>=11.3.0-rc1, <11.3.1
>=10.11.0-rc1+incompatible, <10.11.11+incompatible
>=11.2.0-rc1+incompatible, <11.2.3+incompatible
>=11.3.0-rc1+incompatible, <11.3.1+incompatible
5.3.2-0.20260105134819-cc427af41b2a
10.11.11
11.2.3
11.3.1
10.11.11+incompatible
11.2.3+incompatible
11.3.1+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 Intel 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.