Security readout for executives and security teams
Plain-English summary
Fabrik versions 1.0.0 through 4.7.1 may let an unauthenticated internet user make a Joomla server execute user-supplied code through the PHP form element. Successful exploitation could compromise the site, its data, connected services, and potentially the underlying server.
Executive priority
Treat this as an immediate remediation item for public-facing systems. Inventory Fabrik deployments, prioritize exposed forms, update promptly, and initiate incident review where suspicious activity exists. Internal or inaccessible instances remain important but can follow confirmed internet-facing exposure.
Technical view
CVE-2026-76604 is a CWE-94 code-injection vulnerability in the Fabrik extension for Joomla. The supplied CVSS 4.0 vector rates it 10.0: network-accessible, low complexity, no privileges, and no user interaction, with high confidentiality, integrity, and availability impacts. The stated vulnerable range is 1.0.0 through 4.7.1.
Likely exposure
Exposure is highest for internet-accessible Joomla installations running Fabrik 1.0.0 through 4.7.1, particularly where forms use the PHP form element. The source bundle does not establish whether exploitation requires additional configuration, so administrators should inspect each installation rather than relying only on external scanning.
Exploitation context
The supplied record does not identify this CVE as a known-exploited vulnerability and provides no evidence of active exploitation or a public proof of concept. Its unauthenticated, network-accessible nature and maximum CVSS score nevertheless justify urgent defensive action.
Researcher notes
The public bundle provides the affected range, weakness class, severity vector, and a brief execution description, but no detailed advisory, technical prerequisites, detection indicators, or exploitation evidence. Conclusions about configuration dependence and compromise indicators therefore remain limited; validate against current vendor guidance.
Mitigation direction
- Identify all Joomla sites running Fabrik versions 1.0.0 through 4.7.1.
- Check current Fabrik guidance and upgrade to a vendor-confirmed fixed release; the supplied scope indicates 4.7.2 or later.
- Until updated, remove affected forms from public reach or disable PHP form elements where operationally safe.
- Preserve and review relevant web, Joomla, and PHP logs before returning updated services to normal operation.
Validation and detection
- Verify installed Fabrik versions using trusted administrative inventory, not page metadata alone.
- Enumerate publicly reachable forms and determine whether any use the PHP form element.
- Confirm every affected instance runs a vendor-confirmed fixed version and remains functional.
- Review logs for anomalous form requests, unusual errors, or unexpected PHP execution.
- If compromise is suspected, assess host integrity separately from patch validation.
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-94: Code execution behavior lookup
Code execution and unsafe deserialization weaknesses often justify reviewing execution behavior and process 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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-76604 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 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA: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:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H——JoomlaVulnerability scoring details
Base CVSS 4.0 score
10CriticalVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA: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://www.fabrikar.com/CVE reference, Joomla · product
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 Control of Generation of Code
Improper Control of Generation of Code represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.