Backdrop up to 1.35.0 Configuration Export information disclosure

Summaryinfo

A vulnerability classified as problematic was found in Backdrop up to 1.35.0. This issue affects some unknown processing of the component Configuration Export. Such manipulation leads to information disclosure. This vulnerability is uniquely identified as CVE-2026-104476. The attack can be launched remotely. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Backdrop up to 1.35.0. It has been rated as problematic. Affected by this issue is an unknown function of the component Configuration Export. The manipulation with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-104476 since 10/02/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1592.

Upgrading to version 1.35.1 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

• Backdrop

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19
• 1.20
• 1.21
• 1.22
• 1.23
• 1.24
• 1.25
• 1.26
• 1.27
• 1.28
• 1.29
• 1.30
• 1.31
• 1.32
• 1.33
• 1.34
• 1.35.0

Website

• Product: https://github.com/backdrop/backdrop/

CPE 2.3info

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CPE 2.2info

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Once again VulDB remains the best source for vulnerability data.

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