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Backdrop CmsApplication · Backdropcms

CVE-2024-54123

MEDIUM · 6.1 CVSS v3.1 Published 2024-11-29
Fix available
A fix is available. Upgrade to 1.28.4 / 1.29.2 or later.
See remediation →
68/100
Remediation priority · Elevated
Remotely reachable No privileges

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Backdrop CMS before 1.28.4 and 1.29.x before 1.29.2 allows XSS via an SVG document, if the SVG tag is allowed for a text format.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

Backdrop CMS before versions 1.28.4 and 1.29.2 contains a stored Cross-Site Scripting (XSS) vulnerability in the text format filtering system. When the SVG tag is permitted within a text format's allowed HTML tags, an attacker can embed malicious JavaScript code within an uploaded or inserted SVG document that will execute when viewed by other users.

MitigationUpgrade to Backdrop CMS 1.28.4 or 1.29.2 or later. Alternatively, audit and restrict text format configurations to remove SVG tag permissions if upgrade is not immediately feasible.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Backdrop CmsApplication
Affected:< 1.28.4>= 1.29.0, < 1.29.2

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Check your Backdrop CMS version
    Locate the version number in your Backdrop installation. Common locations include: the changelog file (CHANGELOG.md or CHANGELOG.txt in the root directory), the system info file (includes/version.php), or the administrative dashboard under Reports > Status report. Compare your installed version to the affected ranges: versions below 1.28.4, or versions 1.29.0 through 1.29.1.
    Affected if Your installed version falls within < 1.28.4 or >= 1.29.0 and < 1.29.2
  2. Identify configured text formats
    Access the text format configuration through the Backdrop admin interface at Configuration > Content authoring > Text formats (path: /admin/config/content/formats), or inspect the configuration database table 'filter_format' if you have direct database access.
    Affected if You have text formats configured in your Backdrop installation
  3. Check if SVG tags are permitted in any text format
    For each text format, examine the allowed HTML tags configuration. Look for the 'img' tag element with the 'svg' attribute, or search for 'svg' in the allowed tag list. In the database, check the 'filters' table or serialized filter configuration for filter type 'filter_html' and inspect the 'allowed_html' setting.
    Affected if Any text format has the SVG tag (or img tag with svg:any or svg attribute) listed in its allowed HTML tags configuration
  4. Verify if the SVG-containing content can be uploaded or inserted
    Review whether the affected text format is assigned to any user roles that can create or edit content (check the 'roles' association in the filter_format table or the format configuration). Determine if your site allows file uploads or rich text content insertion using those text formats.
    Affected if Users with access to affected text formats can upload or insert content that renders SVG markup

You are affected if your Backdrop CMS version is below 1.28.4 or between 1.29.0-1.29.1 AND you have any text format that permits SVG tags in its allowed HTML configuration and that format is assignable to user roles.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 1.28.4 / 1.29.2 or later
Fixed in 1.28.41.29.2
Interim mitigation

Upgrade to Backdrop CMS 1.28.4 or 1.29.2 or later. Alternatively, audit and restrict text format configurations to remove SVG tag permissions if upgrade is not immediately feasible.

Recommended fix High confidence

Upgrade to Backdrop CMS 1.28.4 (for 1.28.x users) or 1.29.2 (for 1.29.x users)

  1. 1. Create a complete backup of your Backdrop CMS site including the database and all files.
  2. 2. Download the appropriate fixed version from backdropcms.org (1.28.4 if on 1.28.x branch, or 1.29.2 if on 1.29.x branch).
  3. 3. Extract the new version and replace the /core directory and other core files, preserving your configuration and sites directory.
  4. 4. Run the database update script by accessing /core/update.php in your browser.
  5. 5. Clear all caches via the admin interface (Configuration > Performance > Clear all caches) or using drush cache-clear all if available.
  6. 6. Verify the text formats in Configuration > Content authoring > Text formats and ensure SVG tag filtering is properly configured if still needed.
Caveat Minor patch release with minimal breaking changes expected; always test on staging first

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Backdrop Cms Scoped from the published advisory
  • Consultation2.0 h
  • Implementation2.0 h
  • Testing3.0 h
  • Review / QA1.0 h
8.0 hours of engineering $1,390
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2024-54123 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data