Security readout for executives and security teams
Plain-English summary
Hash Form for WordPress contains a critical flaw allowing an unauthenticated internet user to upload arbitrary files. A successful attack could compromise website confidentiality, integrity, and availability. The supplied advisory identifies versions through 1.4.2 as affected, but provides no confirmed fixed version.
Executive priority
Treat this as an immediate remediation priority for public WordPress sites. Rapidly inventory installations, contain affected versions, and investigate suspicious upload activity. Prioritize sites handling sensitive data or supporting critical business services.
Technical view
CVE-2026-81780 is a CWE-434 unrestricted file-upload vulnerability in Hash Form through version 1.4.2. It is remotely reachable without credentials or user interaction. CVSS 3.1 rates it 10.0, with changed scope and high confidentiality, integrity, and availability impacts.
Likely exposure
Internet-accessible WordPress sites running Hash Form 1.4.2 or earlier are the likely exposure. Actual risk depends on whether the plugin is installed, enabled, and reachable. The supplied CVE affected-product data is incomplete and lists no CPEs.
Exploitation context
The source bundle does not establish active exploitation, and the CVE is not identified as a KEV entry. Arbitrary file upload can enable severe compromise when the server stores or processes attacker-controlled files dangerously, but the supplied sources provide no exploit-path details.
Researcher notes
The public record supports unauthenticated arbitrary file upload and the CVSS vector, but supplies no vulnerable endpoint, root-cause details, proof of concept, observed attacks, or fixed release. The affected-product metadata also reports versions as unavailable despite the description naming versions through 1.4.2.
Mitigation direction
- Identify every WordPress installation using Hash Form and record its installed version.
- Disable or remove affected versions if business operations permit.
- Check Patchstack and the plugin vendor for an official fixed version or mitigation.
- Restrict unnecessary public access until authoritative remediation guidance is available.
- Preserve relevant logs and backups before remediation if compromise is suspected.
Validation and detection
- Confirm whether Hash Form is installed and determine its exact version.
- Verify affected plugin functionality is no longer publicly reachable after mitigation.
- Review web and application logs for unexpected upload activity or suspicious requests.
- Inspect recently created files for unauthorized or unexpected content.
- Check WordPress accounts, configuration, and site files for unexplained changes.
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-2026-81780 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
- 10 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/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:N/UI:N/S:C/C:H/I:H/A:H3.96PatchstackVulnerability scoring details
Base CVSS 3.1 score
10CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/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/hash-form/vulnerability/wordpress-hash-form-plugin-1-4-2-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.
CWE mapping pending import
This CVE carries a CWE mapping that will resolve to a full Glexia CWE intelligence page after the official CWE import is complete.