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Fencer Intel
medium 5.4

CVE-2024-42406 json

Unauthorized access on archived channels

published 2y ago modified 4mo ago also BIT-mattermost-2024-42406 , EUVD-2024-39606

cvss
5.4
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 12%
public exploits
0
none known

Summary

Mattermost versions 9.11.x <= 9.11.0, 9.10.x <= 9.10.1, 9.9.x <= 9.9.2 and 9.5.x <= 9.5.8 fail to properly authorize requests when viewing archived channels is disabled, which allows an attacker to retrieve post and file information about archived channels. Examples are flagged or unread posts as well as files.

Patch / fix

  • bitnami mattermost 9.5.9, 9.9.3, 9.10.2
  • Mattermost Mattermost 9.5.9, 9.9.3, 9.10.2, 9.11.1, 10.0.0

Is CVE-2024-42406 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
2y ago

Exploit prediction

0.22% chance of exploitation in the next 30 days, higher than 12% of all scored CVEs (FIRST EPSS, 2026-11-11).

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
NVD 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
OSV 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
bitnami mattermost
>=9.5.0, <9.5.9
>=9.9.0, <9.9.3
>=9.10.0, <9.10.2
>=9.11.0-rc1, <=9.11.0-rc1
>=9.11.0-rc2, <=9.11.0-rc2
>=9.11.0-rc3, <=9.11.0-rc3
>=9.11.0, <=9.11.0
9.5.9
9.9.3
9.10.2

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.