🛡️ CVE-2026-55808 — drupal

🟡 CVSS 5.0 — Medium ✅ No Known Exploit CWE-79 OSV
5.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

The JSON:API and REST modules allow you to upload image files to image fields.

The validation rules check the file extension of the uploaded file but not the file MIME type. This may allow a malicious user to upload a file that is not an image.

Certain web-server configurations may serve the uploaded file with its actual MIME type rather than an image type. This may lead to cross-site scripting (XSS) or other unexpected behavior.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. A user must be tricked into taking some action. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality low, integrity low, availability none.

Weakness class

CVE-2026-55808 is classified as CWE-79: Cross-site Scripting (XSS). User-supplied data is written into a page without escaping, so attacker script runs in the browser of anyone who views it.

Affected software

CVE-2026-55808 is recorded against 2 packages.

  • drupal
  • drupal/core (from 11.1.0 up to 11.2.0)

Timeline and source

Published on 19 July 2026 and last revised on 20 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

nvd.nist.gov (Web)
www.drupal.org (Web)

Details

Severity MEDIUM
CVSS Score 5.0
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CWE CWE-79
Public Exploit ✅ No
Source OSV
Published 2026-07-19
Updated 2026-08-12
Modified 2026-07-20
Fix URL N/A

Affected Packages

Software From version Fixed in
drupal — —
drupal/core 11.1.0 11.2.0

Similar Threats

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