CVE-2026-89259 Hugo - File System Read & Write

Hugo > v0.43 contains a file read and write vulnerability caused by permissive Node tool execution permissions for TailwindCSS, letting attackers read and write files outside the project directory during build, exploit requires use of TailwindCSS.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
EPSS
0.59% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
File System Read
Impact
File System Read, File System Write
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
11 September 2026
Updated
15 October 2026
Weakness
CWE-250

Vendor fix

Update to version 0.165.0 or later, which removes TailwindCSS from the default security.exec.allow list.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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