EUVD-2026-69990
GHSA-85hq-q7c6-7j82
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Requires low-privilege external provider credentials (PR:L); network vector and low complexity are consistent with a web-layer identity-comparison flaw; no availability impact applies.
Primary rating from Vendor (drupal).
CVSS VectorVendor: drupal
Lifecycle Timeline
4DescriptionCVE.org
Improper Handling of Case Sensitivity vulnerability in Drupal External Authentication allows Privilege Escalation. This issue affects External Authentication versions: from 0.0.0 to 2.0.13.
AnalysisAI
Privilege escalation in Drupal's External Authentication contributed module (versions 0.0.0 through <2.0.13) allows low-privileged network users to gain elevated Drupal permissions by exploiting improper case-sensitivity handling during identity resolution. The module fails to normalize case in username or identity attribute comparisons against existing Drupal accounts, meaning an attacker can present a case-variant identity (e.g., 'Admin' for a privileged 'admin' account) and be mapped to a higher-privileged user. …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The target Drupal site must have the External Authentication contributed module installed, enabled, and configured to delegate authentication to an external provider (LDAP, SAML, SSO, or similar). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 5.4 (AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N) reflects a network-exploitable, low-complexity flaw requiring only low-level privileges, but with bounded impact metrics (C:L/I:L) suggesting partial rather than full compromise in the general case. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Update the External Authentication contributed module to version 2.0.13 or later, as confirmed by Drupal security advisory SA-CONTRIB-2026-098 at https://www.drupal.org/sa-contrib-2026-098. … Detailed patch versions, workarounds, and compensating controls in full report. |
Threat intelligence, references, and detailed analysis are available after sign-in.
Same weakness CWE-178 – Improper Handling of Case Sensitivity
View allSame technique Privilege Escalation
View allShare
External POC / Exploit Code
Leaving vuln.today