Security readout for executives and security teams
Plain-English summary
A logged-in WordPress user with Editor-level access could upload an arbitrary file through Fluent Boards Pro 2.0.11 or earlier. Successful abuse could compromise the website, expose or alter data, and disrupt service. The supplied sources do not confirm public exploitation or a vendor fix.
Executive priority
Treat affected production or internet-facing sites as urgent, especially where Editor credentials may be shared or compromised. Prioritize inventory, account review, and vendor-directed remediation. Immediate incident investigation is warranted if unexpected uploads or privileged-account activity is found.
Technical view
CVE-2026-78274 is a CWE-434 unrestricted file-upload vulnerability affecting Fluent Boards Pro through 2.0.11. It is network-accessible, requires high privileges, needs no user interaction, and may cross a security boundary. CVSS 3.1 rates potential confidentiality, integrity, and availability impacts as high.
Likely exposure
Exposure is limited to WordPress installations running Fluent Boards Pro 2.0.11 or earlier where an attacker controls an Editor-level account. Risk increases for internet-accessible sites, weakly governed privileged accounts, or previously compromised credentials. The bundle’s structured affected-version field is incomplete, so confirm applicability carefully.
Exploitation context
The supplied sources do not establish active exploitation, inclusion in CISA KEV, or public weaponization. Exploitation reportedly requires authenticated Editor privileges, reducing opportunistic exposure but making compromised or malicious privileged accounts important threat scenarios.
Researcher notes
The CVSS vector is 9.1: AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H. The title and description specify versions through 2.0.11 and Editor-level upload capability, but the structured affected entry lists versions as unavailable and defaults to unaffected. No fix version, technical root cause, or exploitation evidence is supplied.
Mitigation direction
- Inventory WordPress sites and identify Fluent Boards Pro installations and versions.
- Check WP Manage Ninja and Patchstack guidance for an official fixed release or mitigation.
- Disable the plugin if affected and no confirmed safe release is available.
- Restrict Editor access and revoke unnecessary, shared, or suspicious privileged accounts.
- Strengthen authentication for privileged WordPress users, including multifactor authentication where supported.
Validation and detection
- Confirm whether Fluent Boards Pro is installed and record its exact version.
- Verify affected instances are upgraded, vendor-mitigated, or disabled.
- Review Editor accounts for unexpected creation, access, or privilege changes.
- Inspect upload records and site files for unexpected executable or recently introduced content.
- Monitor affected sites for unexplained file changes, data access, or service disruption.
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-434: File access and web shell behavior lookup
File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. 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 lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-78274 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
- 9.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/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:H/UI:N/S:C/C:H/I:H/A:H2.36PatchstackVulnerability scoring details
Base CVSS 3.1 score
9.1CriticalVector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/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.
- 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://patchstack.com/database/wordpress/plugin/fluent-boards-pro/vulnerability/wordpress-fluent-boards-pro-plugin-2-0-11-arbitrary-file-upload-vulnerability?_s_id=cveCVE reference, Patchstack · vdb-entry
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.
Unrestricted Upload of File with Dangerous Type
Unrestricted Upload of File with Dangerous Type represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.