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PatchSiren cyber security CVE debrief

CVE-2026-8841 andrewabarber CVE debrief

The Extra Settings for RocketChat plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'rocketchat' shortcode's 'title' attribute in versions up to, and including, 0.1. This is due to insufficient input sanitization and output escaping in the rxstg_shortcode() function, which concatenates the user-supplied 'title' attribute directly into HTML output. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Vendor
andrewabarber
Product
Extra Settings for RocketChat
CVSS
MEDIUM 6.4
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-06-09
Advisory published
2026-06-09
Advisory updated
2026-06-09

Who should care

Users of the Extra Settings for RocketChat plugin for WordPress, particularly those with contributor-level access and above, should be aware of this vulnerability and take steps to mitigate it.

Technical summary

The vulnerability exists in the rxstg_shortcode() function, which fails to properly sanitize and escape user-supplied input in the 'title' attribute of the 'rocketchat' shortcode. This allows authenticated attackers to inject arbitrary web scripts.

Defensive priority

MEDIUM

Recommended defensive actions

  • Update the Extra Settings for RocketChat plugin to a version that fixes this vulnerability.
  • Limit contributor-level access and above to trusted users.
  • Monitor pages for injected scripts.

Evidence notes

The CVE-2026-8841 record and NVD detail provide information on this vulnerability. Additional references include Wordfence threat intel and plugin code.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-8841 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-8841

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

  • CVE-2026-8841 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-8841

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

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://plugins.trac.wordpress.org/browser/extra-settings-for-rocketchat/trunk/rocketchat-extra-settings.php

    [email protected]

  • Source reference

    Unverified legacy reference

    URL: https://plugins.trac.wordpress.org/browser/extra-settings-for-rocketchat/trunk/rocketchat-extra-settings.php

    [email protected]

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.