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PatchSiren cyber security CVE debrief

CVE-2026-39666 telepathy CVE debrief

A DOM-Based XSS vulnerability was found in Hello Bar Popup Builder, affecting versions from n/a through <= 1.5.1. This Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability has a MEDIUM CVSS severity score of 6.5. Limited evidence is available, and further verification is required by users and defenders. The CVE record was published on 2026-04-08T09:16:37.893Z and last modified on 2026-07-24T20:10:00.147Z.

Vendor
telepathy
Product
Hello Bar Popup Builder
CVSS
MEDIUM 6.5
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 and defenders of Hello Bar Popup Builder versions from n/a through <= 1.5.1 should verify their installations and update to a patched version if available. They should also review compensating controls for exposed systems and monitor for suspicious activity.

Technical summary

The CVE-2026-39666 vulnerability is classified as Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'). It allows for DOM-Based XSS attacks with a CVSS score of 6.5 and MEDIUM severity. The vulnerability affects Hello Bar Popup Builder versions from n/a through <= 1.5.1. Limited evidence is available, and further verification is required.

Defensive priority

Medium priority due to the MEDIUM CVSS severity score. Defenders should focus on verifying affected scope, implementing input validation, and reviewing compensating controls.

Recommended defensive actions

  • Verify the installed version of Hello Bar Popup Builder and update to a patched version if available.
  • Implement input validation and sanitization for user-supplied data.
  • Monitor for suspicious activity and implement compensating controls if necessary.
  • Review and update the plugin to ensure it is compatible with the latest security patches.
  • Review compensating controls for exposed systems while remediation is scheduled and verified.

Evidence notes

The CVE record was published on 2026-04-08T09:16:37.893Z and last modified on 2026-07-24T20:10:00.147Z. The NVD entry is currently Deferred. Limited evidence is available, and further verification is required by users and defenders to validate affected scope, severity, and vendor guidance.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-39666 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-39666

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

  • CVE-2026-39666 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-39666

    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.