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PatchSiren cyber security CVE debrief

CVE-2026-77027 fabrikar.com CVE debrief

CVE-2026-77027 is a high-severity vulnerability in the Fabrik extension for Joomla, allowing unauthenticated stored cross-site scripting (XSS). The vulnerability affects versions prior to 4.7.2 and is caused by inadequate handling of user-supplied input in the jsactions feature. This vulnerability has significant implications for defenders, as it could allow attackers to inject malicious scripts into the affected systems. Defenders should assess their exposure and prioritize patching or mitigation to prevent potential exploitation.

Vendor
fabrikar.com
Product
Fabrik extension for Joomla
CVSS
HIGH 8.6
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-22
Original CVE updated
2026-10-12
Advisory published
2026-08-22
Advisory updated
2026-10-12

Who should care

Defenders responsible for Joomla installations with the Fabrik extension should assess exposure and prioritize patching or mitigation. This includes operators of websites, security teams, and vulnerability management teams who need to verify the presence of the vulnerable component and take appropriate measures to prevent exploitation. Additionally, platform administrators and security personnel should review the Fab

Why it matters

CVE-2026-77027 is a high-severity vulnerability in the Fabrik extension for Joomla, allowing unauthenticated stored cross-site scripting (XSS). Defenders should prioritize verifying exposure and applying patches or mitigations to prevent exploitation.

  • Potential for unauthenticated XSS exploitation
  • Risk of malicious script injection
  • Need for verification of Fabrik installation exposure
  • Priority for patching or mitigating vulnerable versions

Technical summary

The vulnerability is caused by inadequate handling of user-supplied input in the jsactions feature of the Fabrik extension for Joomla, allowing unauthenticated stored cross-site scripting (XSS). This issue affects Fabrik versions prior to 4.7.2. The vulnerability has a high CVSS score of 8.6, indicating a high severity level. Defenders should prioritize verifying exposure of Fabrik installations and applying patches or mitigations to prevent exploitation.

Defensive priority

Defenders should prioritize verifying exposure of Fabrik installations and applying patches or mitigations to prevent exploitation.

Recommended defensive actions

  • Verify exposure of Fabrik installations
  • Apply patches or mitigations to prevent exploitation
  • Monitor for suspicious activity

Evidence notes

The CVE record and NVD entry provide limited information about the vulnerability, but indicate that it is a high-severity issue affecting Fabrik versions prior to 4.7.2.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-77027 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-77027

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-77027 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-77027

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.