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PatchSiren cyber security CVE debrief

CVE-2026-39571 Themefic CVE debrief

CVE-2026-39571 is a MEDIUM severity vulnerability in Instantio, with a CVSS score of 5.3. The vulnerability is described as Exposure of Sensitive System Information to an Unauthorized Control Sphere, allowing Retrieve Embedded Sensitive Data. This issue affects Instantio from n/a through <= 3.3.30. The vulnerability has a CVSS vector of CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N. It was reported by [email protected] and is associated with CWE-497. The NVD entry for this vulnerability is currently Deferred. Users of Instantio plugin for WordPress, especially those using versions up to 3.3.30, should be aware of this vulnerability and take necessary actions to mitigate the risk.

Vendor
Themefic
Product
Instantio
CVSS
MEDIUM 5.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-08
Original CVE updated
2026-07-24
Advisory published
2026-04-08
Advisory updated
2026-07-24

Who should care

Users of Instantio plugin for WordPress, especially those using versions up to 3.3.30, should be aware of this vulnerability and take necessary actions to mitigate the risk. This includes reviewing and applying patches or updates, monitoring for suspicious activity, and considering compensating controls.

Technical summary

The vulnerability has a CVSS vector of CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N. It was reported by [email protected] and is associated with CWE-497. The NVD entry for this vulnerability is currently Deferred. Limited information is available about the vulnerability, and further investigation is recommended. The CVE record was published on 2026-04-08T09:16:28.360Z and was last modified on 2026-07-24T21:10:00.143Z.

Defensive priority

MEDIUM

Recommended defensive actions

  • Inventory and verify Instantio plugin versions
  • Apply patches or updates if available
  • Monitor for suspicious activity
  • Consider compensating controls
  • Review relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record was published on 2026-04-08T09:16:28.360Z and was last modified on 2026-07-24T21:10:00.143Z. The NVD entry is currently Deferred. Limited information is available about the vulnerability, and further investigation is recommended. The vulnerability affects Instantio plugin for WordPress, especially those using versions up to 3.3.30.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-39571 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-39571

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

  • CVE-2026-39571 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-39571

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

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.