Security readout for executives and security teams
Plain-English summary
A flaw in the 6Storage Rentals WordPress plugin can let an unauthenticated attacker impersonate any existing site user whose email address they supply, including an administrator. Successful abuse could provide full control of the WordPress site, its content, user data, and connected services.
Executive priority
Treat this as an emergency remediation item for every internet-facing site using the affected plugin. The flaw can directly become administrator-level compromise without credentials or user interaction. Disable the plugin if a vendor-confirmed fixed version is unavailable, while preserving evidence and initiating incident review where suspicious activity exists.
Technical view
Versions through 2.27.0 expose the six_storage_create_wp_user() AJAX handler to unauthenticated requests. The handler lacks nonce, capability, credential, and account-ownership checks, yet selects a user from a supplied email address and establishes that user’s authenticated session. This is an authentication bypass classified as CWE-287 with CVSS 3.1 score 9.8.
Likely exposure
Internet-accessible WordPress sites running and activating 6Storage Rentals version 2.27.0 or earlier are likely exposed. Risk is especially severe when administrator email addresses are public, predictable, or previously leaked. The supplied evidence does not establish installation prevalence or whether particular configurations prevent access to the handler.
Exploitation context
Exploitation requires no prior account, privileges, or user interaction and has low stated complexity. An attacker must provide an existing user’s email address. The supplied record is not in KEV and provides no evidence of active exploitation, public weaponization, or observed attacks.
Researcher notes
The supplied WordPress Trac references identify the unauthenticated AJAX registration and relevant handler code. Evidence supports the described authentication bypass through version 2.27.0, but the bundle does not name a patched version or vendor mitigation. Avoid treating KEV absence as proof that exploitation has not occurred.
Mitigation direction
- Identify all WordPress sites running 6Storage Rentals version 2.27.0 or earlier.
- Check current vendor guidance for a confirmed fixed release and apply it immediately when available.
- Disable or remove the plugin until a verified fix is deployed if business operations permit.
- If compromise is suspected, revoke active sessions, rotate credentials, and review administrator accounts and site changes.
Validation and detection
- Confirm the installed plugin version and whether 6Storage Rentals is active on each WordPress site.
- Verify unauthenticated access to the affected AJAX action is blocked, using safe authorized testing only.
- Review web and application logs for unexpected requests involving six_storage_create_wp_user.
- Inspect administrator accounts, authentication sessions, plugins, themes, content, and configuration for unauthorized changes.
- After remediation, confirm the affected handler enforces authentication, authorization, and request-integrity checks.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-287: Credential and account abuse lookup
Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-15303 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9WordfenceVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- Source timelineWordfence
Disclosed
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://www.wordfence.com/threat-intel/vulnerabilities/id/94e987be-bdfc-4691-b250-2b7d7249df0a?source=cveCVE reference, Wordfence
- https://plugins.trac.wordpress.org/browser/6storage-rentals/tags/2.27.0/inc/Base/Six_Storage_DashboardController.php#L3905CVE reference, Wordfence
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Authentication
Improper Authentication represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.