CVE-2026-100157 roxnor CVE debrief

Who should care

Defenders responsible for WordPress installations with the WP Ultimate Review plugin version 2.4.3 or earlier should assess exposure and prioritize verification and potential updates.

Why it matters

Defenders should care about CVE-2026-100157 because it allows unauthenticated attackers to execute arbitrary shortcodes in WordPress installations with the vulnerable WP Ultimate Review plugin. This requires verification of the plugin version and potential updates to prevent exploitation.

• Unauthenticated attackers can execute arbitrary shortcodes
• Potential for exploitation requires no account and no privileged interaction
• Submitted shortcode payloads are auto-published without admin approval by default

Technical summary

The WP Ultimate Review plugin for WordPress is vulnerable to arbitrary shortcode execution due to improper validation of values before running do_shortcode. This allows unauthenticated attackers to execute arbitrary shortcodes. Defenders should assess exposure and prioritize verification and potential updates for WordPress installations with the vulnerable WP Ultimate Review plugin version 2.4.3 or earlier. The vulnerability has a CVSS score of 6.5 and is considered MEDIUM severity. The CVE record and NVD entry provide details on the vulnerability, including its description and CVSS score.

Defensive priority

Defenders should prioritize verifying the presence of the WP Ultimate Review plugin version 2.4.3 or earlier in their WordPress installations and consider updating to a patched version if available.

Recommended defensive actions

• Verify the presence of the WP Ultimate Review plugin version 2.4.3 or earlier in WordPress installations
• Consider updating to a patched version if available
• Monitor for potential exploitation attempts
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its description and CVSS score. However, the corpus does not establish versions, exploitation, impact, or remediation beyond the plugin's vulnerability.

Sources and 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.