All vulnerabilities
CVE-2026-104476

Backdrop CMS before 1.35.1 Information Disclosure via Configuration Export Archive

backdrop backdrop
Open in ThreatlineRecord JSON
CVSS
8.2High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.29%Chance of exploitation activity in the next 30 days, higher than 20% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in1.35.1Fixed versionCVE List
Published2 Oct 2026Updated 5 Oct 2026CVE List

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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.

Text from CVE List

Affected versions 2

  • backdropaffected: all versions before 1.35.1CVE List
  • backdropunaffected: 1.35.1CVE List

References 4