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Vulnerability record · CVE-2026-104476 · published 3 October 2026

CVE-2026-104476: Information exposure vulnerability

Backdrop CMS before 1.35.1 contains an information disclosure vulnerability that allows unauthenticated attackers to retrieve configuration export archives left on the server after transfer. Attackers can download compressed archives generated by users with configuration export permission to obtain the full site configuration, including sensitive settings.

8.2 CVSS 4.0 High CWE-200 · Information exposure Received
8.2CVSS 4.0 base score
-EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
3 Oct 2026Last modified by NVD

Description

Backdrop CMS before 1.35.1 contains an information disclosure vulnerability that allows unauthenticated attackers to retrieve configuration export archives left on the server after transfer. Attackers can download compressed archives generated by users with configuration export permission to obtain the full site configuration, including sensitive settings.

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://backdropcms.org/security/backdrop-sa-core-2026-006
https://github.com/backdrop/backdrop
https://github.com/backdrop/backdrop/commit/1ae67061d9d487bb6cb3b8611191354052f34749
https://www.vulncheck.com/advisories/backdrop-cms-before-1.35.1-information-disclosure-via-configuration-export-archive

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Source: NIST National Vulnerability Database (record CVE-2026-104476), CISA KEV, FIRST EPSS. This page is refreshed as NVD updates the record.