CVE-2026-55810 Overview
CVE-2026-55810 is an object injection vulnerability affecting the Drupal Plotly.js Graphing module. The flaw is classified under CWE-915: Improperly Controlled Modification of Dynamically-Determined Object Attributes. Attackers with low privileges can exploit the flaw over the network without user interaction. The vulnerability affects Plotly.js Graphing versions 0.0.0 through 3.0.2. Successful exploitation can compromise confidentiality and integrity of the Drupal application by allowing manipulation of internal object attributes.
Critical Impact
Authenticated remote attackers can inject arbitrary object attributes into the Plotly.js Graphing module, leading to potential data tampering and information disclosure on affected Drupal sites.
Affected Products
- Drupal Plotly.js Graphing module versions 0.0.0 to 3.0.2
- Drupal sites with the Plotly.js Graphing contrib module enabled
- Any Drupal deployment relying on vulnerable Plotly.js Graphing releases
Discovery Timeline
- 2026-07-10 - CVE-2026-55810 published to NVD
- 2026-07-14 - Last updated in NVD database
Technical Details for CVE-2026-55810
Vulnerability Analysis
The Drupal Plotly.js Graphing module fails to properly control modification of dynamically-determined object attributes. This class of flaw, tracked as CWE-915, lets attackers manipulate object properties that were not intended to be user-controllable. The module accepts input that is used to assign values to object attributes without adequate allowlisting or type enforcement. As a result, an attacker with a low-privileged Drupal account can inject unexpected attributes into internal objects processed by the module.
The attack requires network access and low complexity, making exploitation practical against exposed Drupal sites. Impact spans confidentiality and integrity, though availability is not directly affected. The EPSS score is 0.248% with a percentile of 16.197, reflecting low observed exploitation activity at time of publication.
Root Cause
The root cause is unsafe assignment of object properties from attacker-influenced input within the Plotly.js Graphing module. Rather than validating attribute names against a fixed schema, the module dynamically writes properties based on request data. This pattern enables Object Injection, where prototype or configuration properties can be overwritten to alter application behavior.
Attack Vector
An authenticated attacker submits a crafted request to a Drupal endpoint that invokes the vulnerable Plotly.js Graphing rendering or configuration logic. The payload includes unexpected attribute keys that the module writes into internal objects. Because the vulnerability is network-reachable and requires no user interaction, it can be exploited directly against production sites once valid credentials are obtained.
No public proof-of-concept exploit code has been released. Refer to the Drupal Security Advisory 2026-050 for vendor-supplied technical details.
Detection Methods for CVE-2026-55810
Indicators of Compromise
- Unexpected HTTP POST or PATCH requests to Drupal endpoints associated with the Plotly.js Graphing module containing unusual JSON attribute names
- Log entries showing configuration or chart rendering payloads with reserved property names such as __proto__, constructor, or prototype
- Anomalous modifications to node or field configuration tied to Plotly visualizations
Detection Strategies
- Inspect Drupal watchdog and web server logs for requests targeting Plotly.js Graphing routes with abnormally large or nested JSON bodies
- Deploy Web Application Firewall (WAF) rules that flag attribute names commonly abused in Object Injection, including __proto__ and constructor
- Baseline legitimate Plotly configuration payloads and alert on schema deviations
Monitoring Recommendations
- Enable verbose logging on Drupal contrib modules and forward events to a centralized SIEM for correlation
- Track authenticated user activity for accounts with permissions to edit Plotly-backed content or configuration
- Monitor outbound requests from the Drupal host for signs of secondary exploitation following object injection
How to Mitigate CVE-2026-55810
Immediate Actions Required
- Upgrade the Drupal Plotly.js Graphing module to a version later than 3.0.2 as directed by the Drupal Security Advisory 2026-050
- Audit Drupal user accounts and revoke unnecessary permissions to content types that use Plotly visualizations
- Review recent changes to Plotly-backed configuration entities for signs of tampering
Patch Information
Drupal has published remediation guidance in Drupal Security Advisory 2026-050. Apply the fixed release of the Plotly.js Graphing module and clear Drupal caches after the update. Confirm the installed version using drush pm:list or the Extend administration page.
Workarounds
- Disable the Plotly.js Graphing module until the patched release can be deployed
- Restrict access to endpoints and content types that invoke Plotly.js Graphing rendering to trusted administrators only
- Apply WAF signatures to block requests containing prototype-pollution attribute names against Drupal routes
# Configuration example: update the Plotly.js Graphing module using Composer and Drush
composer update drupal/plotly_js_graphing --with-dependencies
drush updatedb
drush cache:rebuild
drush pm:list --filter=plotly_js_graphing
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
