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PatchSiren cyber security CVE debrief

CVE-2026-84915 Drupal CVE debrief

A Cross-site Scripting (XSS) vulnerability exists in the Drupal Component blocks module, affecting versions from 0.0.0 to 1.2.7. This issue allows for Stored XSS, which can be exploited by injecting malicious code into the component blocks. The vulnerability was published on October 22, 2026, and has been assessed as moderately critical. Defenders should prioritize updates to version 1.2.7 or later. Inventory checks and monitoring for suspicious activity are recommended to mitigate potential code injection and execution. The vulnerability can be exploited by injecting malicious code, which can then be executed by other users, potentially leading to data tampering or theft.

Vendor
Drupal
Product
Component blocks
CVSS
Unknown
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-22
Original CVE updated
2026-10-22
Advisory published
2026-10-22
Advisory updated
2026-10-22

Who should care

Defenders responsible for Drupal installations using the Component blocks module should assess exposure and prioritize updates. This vulnerability can be exploited by injecting malicious code, which can then be executed by other users.

Why it matters

CVE-2026-84915 is a moderately critical Cross-site Scripting (XSS) vulnerability in the Drupal Component blocks module. Defenders should prioritize updates to version 1.2.7 or later. Inventory checks and monitoring are recommended to mitigate potential code injection and execution.

  • Potential code injection and execution
  • Possible data tampering or theft
  • Required verification of affected versions and exposure
  • Need for prompt updates to mitigate vulnerability

Technical summary

The Drupal Component blocks module is vulnerable to Stored Cross-site Scripting (XSS). The issue affects versions from 0.0.0 to 1.2.7. This vulnerability allows an attacker to inject malicious code into the component blocks, which can then be executed by other users.

Defensive priority

Defenders should prioritize updating to version 1.2.7 or later to mitigate this vulnerability. Inventory checks and monitoring for suspicious activity are recommended.

Recommended defensive actions

  • Update to version 1.2.7 or later
  • Inventory checks for affected versions
  • Monitoring for suspicious activity

Evidence notes

The vulnerability is confirmed by the CVE Program and NVD. The affected versions and details are provided by the Drupal project and CVE Program. Evidence limits are based on available information from these sources. Defenders should verify affected versions and exposure, and review official advisories for further guidance. The CVE Program and NVD provide official records of the vulnerability, but additional information may be needed to fully assess the impact.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-84915 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-84915

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-84915 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-84915

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.