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CVE

CVE-2026-4858

Mattermost has a Path Traversal issue
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CVE

CVE-2026-4858

Mattermost has a Path Traversal issue

Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to check integration URL for path traversal which allows an malicious authenticated user  to call an arbitrary API via system admin Mattermost auth token using via path traversal in integration action URL. Mattermost Advisory ID: MMSA-2026-00640.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
8
-
3.1
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H
C
H
U
9.9
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Related Resources

No items found.

References

https://nvd.nist.gov/vuln/detail/CVE-2026-4858, https://github.com/mattermost/mattermost, https://mattermost.com/security-updates

Severity

9.9

CVSS Score
0
10

Basic Information

Base CVSS
9.9
EPSS Probability
0.00249%
EPSS Percentile
0.16134%
Introduced Version
11.6.0,v11.6.0-rc1+incompatible,v11.5.0-rc1+incompatible,v10.12.0-rc1+incompatible,v8.0.0+incompatible,v8.0.0-20230611052435-efaa6264cc9a,v8.0.0-20230418053528-b200a078819e,v6.0.0-20230322212227-c943ed6859b1,v7.8.0,v6.0.0-20221221191026-c25270414086,v6.0.0-20221221131157-dcf499b51df7,v7.7.0,v6.0.0-20221124135236-372653a92136,v6.0.0-20221124081329-6c55c4d35692,v7.1.0,v6.0.0-20220525163608-ea5bfe3fd956,v6.0.0,v6.0.0-20210722065147-c4b4e1bc38eb,v5.26.0-rc1,v5.0.0-20200521082456-43e606173b8a,v5.18.0-rc1,v5.18.0-rc.test,v5.0.0-20191128133938-2259b7f2a8b9,v5.12.0-rc1,v0.0.0-20191106103959-516017d3c9be,v5.6.0-rc1+incompatible,v0.0.0-20181119202717-8cfca681b0f0
Fix Available
11.6.1,v11.6.1-rc1+incompatible,v11.5.3+incompatible,v11.4.5+incompatible,v10.11.15-rc1+incompatible,v8.0.0-20260410120214-a244c1704e77

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