# CVE-2026-55805 — Drupal core

> As of 2026-08-26, CVE-2026-55805 is a MEDIUM-severity vulnerability in Drupal core, CVSS v3.1 5.4, EPSS 0.1% (4.4th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-55805 as of 2026-08-26; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-08-26

## What is CVE-2026-55805?

Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal Drupal core allows Stored XSS. This issue affects Drupal core versions: from 0.0.0 to 10.6.13, from 11.3.0 to 11.3.14, from 11.4.0 to 11.4.4, from 0.0.0 to 11.0.*, from 0.0.0 to 11.1.*, from 0.0.0 to 11.2.*.

The record classifies CVE-2026-55805 under weakness class [CWE-79](https://intel.threadlinqs.com/cwe/CWE-79). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs a user to take an action first. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 41 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 5.4 — MEDIUM (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N`)
- **EPSS (FIRST):** 0.1% probability of exploitation in the next 30 days, higher than 4.4% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 2.9/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-25, last modified 2026-08-26

## Is CVE-2026-55805 being exploited?

It currently carries a trending score of 31 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [Drupal](https://intel.threadlinqs.com/vendors/drupal): core

## How to fix CVE-2026-55805

No vendor patch reference has been recorded for CVE-2026-55805 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-55805

No threat campaign in the Threadlinqs corpus currently references CVE-2026-55805, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, GitHub Security Advisories, FIRST EPSS. Last verified by Threadlinqs on 2026-08-26.

**Other references**

- [drupal.org](https://www.drupal.org/sa-core-2026-012)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-55805
Full detection coverage and IOCs for threats exploiting CVE-2026-55805 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp