Unrated

Cross-Site Scripting in Drupal CMS

IdentifiersCVE-2026-15916CWE-79

CVE-2026-15916 is a vulnerability in Drupal CMS that was addressed as part of a set of security fixes released in July 2026. Available information indicates the flaw allows remote code injection in the browser context through cross-site scripting (XSS). The issue affects vulnerable Drupal releases prior to the fixed versions and may enable attacker-supplied script content to be executed in a victim user's session. Specific details about the affected component or function are not currently available.

For your environment

Are you exposed to this one?

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation can allow an attacker to inject and execute malicious client-side code in the context of a victim's browser session when interacting with a vulnerable Drupal site. This can lead to compromise of data confidentiality, including unauthorized access to sensitive information exposed to the affected session.

Mitigation

If you can’t patch tonight, do this now.

Until patching is completed, reduce exposure by limiting access to administrative and content submission interfaces, reviewing and restricting untrusted user-supplied content handling, and enforcing browser-side protections such as a strong Content Security Policy where feasible. Prioritize prompt installation of the vendor security updates, as mitigation alone is unlikely to fully eliminate XSS risk.

Remediation

Patch, then assume compromise.

Upgrade Drupal CMS to a fixed release. Reported fixed versions include 11.4.4 or later for the 11.4.x branch, 11.3.14 or later for the 11.x branch, and 10.6.13 or later for affected earlier 10.x releases. Apply the vendor's July 2026 security updates and validate that all Drupal instances are running a patched version.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

DrupalDrupalapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

2 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.

2 SOURCESView more in app

No news coverage yet. Advisories and community discussion only.

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity1