Security readout for executives and security teams
Plain-English summary
Backdrop CMS 1.14.x before 1.14.2 could let a privileged user place unsafe content in a file type description. When another administrator views the file type list, scripting could run in that administrator's browser. Exposure is narrowed because the attacker needs the "Administer file types" permission.
Executive priority
Treat as a moderate-priority remediation for affected Backdrop CMS sites. The flaw targets administrator browser sessions, but the attacker must already hold a powerful content-administration permission.
Technical view
The issue is an XSS flaw in Backdrop CMS file type description rendering. Output was not sufficiently filtered when displaying administrator-created file type descriptions. The vulnerable range stated by the source is Backdrop CMS 1.14.x before 1.14.2. No CVSS, CWE, or KEV active-exploitation signal is provided.
Likely exposure
Likely limited to Backdrop CMS sites running 1.14.x before 1.14.2 where users beyond fully trusted administrators can administer file types. Sites without delegated file type administration have lower practical exposure.
Exploitation context
The provided sources do not report active exploitation. Exploitation requires an account or role with "Administer file types" permission and an administrator viewing the file type list, making this a privilege-dependent stored XSS scenario.
Researcher notes
Focus validation on version, role delegation, and stored content in file type descriptions. The source data does not include CVSS metrics, CWE mapping, exploit maturity, or detailed patch internals, so avoid overclaiming impact beyond XSS through file type description display.
Mitigation direction
- Upgrade affected Backdrop CMS 1.14.x deployments to 1.14.2 or later.
- Review who has the "Administer file types" permission.
- Remove that permission from users who do not strictly need it.
- Review existing file type descriptions for suspicious or unexpected markup.
- Check the Backdrop advisory for any environment-specific guidance.
Validation and detection
- Inventory Backdrop CMS versions and flag 1.14.x before 1.14.2.
- List roles and users with "Administer file types" permission.
- Confirm upgraded sites report Backdrop CMS 1.14.2 or later.
- Review file type descriptions created before remediation.
- Check logs or audit trails for recent file type description changes.
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-2019-19903 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-2019-015CVE 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.