Security readout for executives and security teams
Plain-English summary
FastDup for WordPress up to 2.7.1 lets logged-in users with Contributor-level access create and download full-site backups. Those backups may include the database and configuration files, exposing sensitive data and credentials. Sites with many contributors or weak account controls should treat this as urgent.
Executive priority
Prioritize remediation for production WordPress sites with Contributor users or external content workflows. The main business risk is theft of complete site backups, which can expose customer data, credentials, and operational configuration.
Technical view
CVE-2026-1104 is a CWE-862 missing authorization flaw in FastDup REST API endpoints. Authenticated Contributor+ users can access backup creation and download functions without an adequate capability check. The reported impact includes full WordPress installation archives, database exports, and configuration files. CVSS is 8.8 high.
Likely exposure
Exposure is limited to WordPress sites running FastDup <= 2.7.1 where an attacker has, or can obtain, Contributor-level or higher credentials. Public anonymous exploitation is not described in the provided sources.
Exploitation context
The issue requires authentication but low privileges. It is especially relevant for sites allowing contributor registration, agencies with many content users, or compromised low-privilege accounts. The CVE is not listed as KEV in the provided bundle, and no active exploitation evidence is cited.
Researcher notes
The public record identifies missing capability checks on FastDup REST API endpoints and references WordPress plugin Trac code plus changeset 3449530. The sources do not provide KEV status, active exploitation confirmation, or a clearly named fixed release version.
Mitigation direction
- Update FastDup to a version newer than 2.7.1 if available from the vendor repository.
- If no fixed version is available, disable or remove FastDup until vendor guidance is available.
- Restrict Contributor-level access to trusted accounts only.
- Review WordPress users and remove unnecessary or stale contributor accounts.
- Rotate secrets if unauthorized backup download is suspected.
Validation and detection
- Inventory WordPress sites for the FastDup plugin and its installed version.
- Confirm whether any instance is running version 2.7.1 or earlier.
- Review WordPress users with Contributor or higher roles.
- Check web and application logs for unexpected FastDup REST API activity.
- Look for unexpected backup archives or downloads created by low-privilege users.
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-862: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. 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 lookupDatabase behavior lookup
The CVE wording references database injection or access, so collection and exfiltration review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-1104 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
- High
- CVSS
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/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.
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:L/UI:N/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.wordfence.com/threat-intel/vulnerabilities/id/29c0fb4d-c38c-4c78-9e15-797f3c3a4b30?source=cveCVE reference
- https://plugins.trac.wordpress.org/browser/fastdup/trunk/includes/Endpoint/PackageApi.php#L371CVE reference
- https://plugins.trac.wordpress.org/changeset/3449530/CVE reference
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.
Missing Authorization
Missing Authorization represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.