CVE-2026-104476

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

8.2CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS 3.1

5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS

0.3% chance of exploitation in the next 30 days; higher than 21% of CVEs (scores of 2026-10-25)

CWE

CWE-200

Published

2026-10-03

Modified

2026-10-06

Record from

the NVD, synced 2026-10-19

References

• 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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