PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-100747 svenbluege.de CVE debrief

The CVE-2026-100747 vulnerability is a CSRF issue in the Event Gallery extension for Joomla, allowing third-party sites to upload files and overwrite existing ones. Defenders should assess exposure, prioritize remediation, and verify affected versions. This issue affects versions prior to 6.5.0 and has a CVSS score of 5.1, indicating a medium severity. The vulnerability can lead to unauthorized file uploads and overwrites, potentially impacting the integrity of event data and the security of Joomla installations.

Vendor
svenbluege.de
Product
Event Gallery for Joomla
CVSS
MEDIUM 5.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-27
Original CVE updated
2026-09-27
Advisory published
2026-09-27
Advisory updated
2026-09-27

Who should care

Joomla administrators and users with Event Gallery extension installed should assess exposure, prioritize remediation, and verify affected versions due to potential for unauthorized file uploads and overwrites. This includes reviewing Joomla installations, verifying version numbers, and applying patches or mitigations as needed.

Why it matters

Defenders should assess exposure of Joomla installations with Event Gallery extension, prioritize remediation, and verify affected versions due to potential for unauthorized file uploads and overwrites.

  • Potential for unauthorized file uploads and overwrites
  • Need for verification of affected versions and patches
  • Monitoring for suspicious activity

Technical summary

The Event Gallery extension for Joomla is vulnerable to CSRF, allowing third-party sites to upload files and overwrite existing ones. This issue affects versions prior to 6.5.0 and has a CVSS score of 5.1, indicating a medium severity. The vulnerability can lead to unauthorized file uploads and overwrites, potentially impacting the integrity of event data and the security of Joomla installations.

Defensive priority

Medium priority for Joomla users with Event Gallery extension

Recommended defensive actions

  • Assess exposure of Joomla installations with Event Gallery extension
  • Verify affected versions and apply patches
  • Monitor for suspicious file uploads

Evidence notes

The CVE record and NVD entry provide limited information about affected versions and exploitation. Further verification is needed to assess exposure and apply patches. The Event Gallery extension for Joomla versions prior to 6.5.0 is vulnerable to CSRF, allowing third-party sites to upload files and overwrite existing ones. The CVE record was published on 2026-09-27T12:17:10.557Z and has not been modified since then.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-100747 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-100747

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

  • CVE-2026-100747 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-100747

    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.