Security readout for executives and security teams
Plain-English summary
Backdrop CMS 1.11.0 and earlier could allow unexpected JavaScript to run through improperly sanitized custom class names on blocks and layouts. Business risk depends on whether your site uses affected versions and exposes affected pages to logged-in users. The cited source says this was fixed in 1.11.1 and later.
Executive priority
Treat as a normal-priority web application patch unless the site has many privileged users or sensitive authenticated workflows. Upgrade during the next maintenance window, sooner for externally exposed administrative or editorial sites.
Technical view
The issue is an XSS vulnerability in sanitization of custom class names used by Backdrop CMS blocks and layouts. The described attack condition requires a logged-in user to be directed to an affected page. No CVSS score or CWE is provided in the source bundle.
Likely exposure
Organizations running Backdrop CMS 1.11.0 or earlier are the relevant exposure group. Risk is more likely where custom block or layout class names are used and logged-in users can be sent to affected pages.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. The CVE description says exploitation requires directing a logged-in user to an affected page, which makes phishing or social engineering a likely prerequisite.
Researcher notes
Evidence is limited to the CVE description and Backdrop advisory reference. There is no CVSS vector, CWE mapping, or cited exploitation report in the bundle. Avoid assuming broader Backdrop versions or modules beyond 1.11.0 and earlier core behavior.
Mitigation direction
- Upgrade Backdrop CMS to version 1.11.1 or later.
- Identify any Backdrop CMS instances running 1.11.0 or earlier.
- Review vendor advisory for additional site-specific guidance.
- Limit logged-in access to trusted users until upgraded.
Validation and detection
- Confirm installed Backdrop CMS versions across all environments.
- Verify production and staging are on 1.11.1 or later.
- Review use of custom class names on blocks and layouts.
- Confirm affected pages are not relied on by privileged users before remediation.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2018-1000813 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://backdropcms.org/security/backdrop-sa-core-2018-005CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.