CVE-2026-107256
Shield - Moderately critical - Access bypass - SA-CONTRIB-2026-248
Improper Restriction of Excessive Authentication Attempts vulnerability in Drupal Shield allows Brute Force. This issue affects Shield versions: from 0.0.0 to 1.9.0.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Shield - Moderately critical - Access bypass - SA-CONTRIB-2026-248
Improper Restriction of Excessive Authentication Attempts vulnerability in Drupal Shield allows Brute Force. This issue affects Shield versions: from 0.0.0 to 1.9.0.
- Record
CVE-2026-107256- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N - Weakness
- CWE-307
- Updated
- 2026-11-06
EUVDEUVD-2026-113524
Improper Restriction of Excessive Authentication Attempts vulnerability in Drupal Shield allows Brute Force. This issue affects Shield versions: from 0.0.0 to 1.9.0.
- Record
EUVD-2026-113524- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N - Updated
- 2026-11-06
GitHub AdvisoriesGHSA-g7cw-wmq5-44qr
Improper Restriction of Excessive Authentication Attempts vulnerability in Drupal Shield allows...
Improper Restriction of Excessive Authentication Attempts vulnerability in Drupal Shield allows Brute Force. This issue affects Shield versions: from 0.0.0 to 1.9.0.
- Record
GHSA-g7cw-wmq5-44qr- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N - Weakness
- CWE-307
- Updated
- 2026-11-06
NVD
Improper Restriction of Excessive Authentication Attempts vulnerability in Drupal Shield allows Brute Force. This issue affects Shield versions: from 0.0.0 to 1.9.0.
- Record
CVE-2026-107256- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N - Weakness
- CWE-307
- Updated
- 2026-11-06
OSVDRUPAL-CONTRIB-2026-248 No score
The Shield module enables you to protect a site behind an HTTP basic authentication prompt, so that an unfinished or non-public site cannot be viewed, crawled or indexed by anonymous visitors.
The module doesn't sufficiently limit the number of authentication attempts it will evaluate under the scenario where an anonymous visitor repeatedly submits basic authentication credentials.
This vulnerability is mitigated by the fact that the configured Shield credentials must be guessable — a long, randomly generated password is not practically brute forceable — and by the fact that Shield is intended as a supplementary barrier in front of a site rather than the site's user access control systems.
- Record
DRUPAL-CONTRIB-2026-248- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
drupal/shieldPackagist:https://packages.drupal.org/8 |
before 1.9.0 | 1.9.0 |
History
| Recorded | Changed | Sources |
|---|---|---|
| severity | CVE List | |
| facts, severity | EUVD | |
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-107256 is a medium vulnerability (CVSS 5.3) in Codeigniter4 Shield, published October 21, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.27%, the 19th percentile. Fixed in drupal/shield 1.9.0.