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PatchSiren cyber security CVE debrief

CVE-2026-107508 Ultimate Multisite CVE debrief

CVE-2026-107508 is a vulnerability in the Ultimate Multisite WordPress plugin before version 2.17.2. The plugin does not validate a user-supplied value used to select a file to include, allowing unauthenticated attackers to include and read arbitrary local files, including the WordPress configuration file. Defenders should assess exposure, prioritize verification, and ensure updates to 2.17.2 or later. Server logs should be reviewed for suspicious activity and monitor for potential exploitation attempts.

Vendor
Ultimate Multisite
Product
Ultimate Multisite
CVSS
Unknown
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-14
Original CVE updated
2026-10-14
Advisory published
2026-10-14
Advisory updated
2026-10-14

Who should care

Defenders responsible for WordPress installations with the Ultimate Multisite plugin should assess exposure and prioritize verification and remediation.

Why it matters

CVE-2026-107508 is a vulnerability in the Ultimate Multisite WordPress plugin that allows unauthenticated attackers to include and read arbitrary local files. Defenders should prioritize verifying the plugin version and monitoring for potential exploitation attempts.

  • Unauthenticated attackers may be able to read arbitrary local files, including the WordPress configuration file.
  • Defenders should verify the version of the Ultimate Multisite plugin and ensure it is updated to 2.17.2 or later.
  • Server logs should be reviewed for suspicious activity.

Technical summary

The Ultimate Multisite WordPress plugin before version 2.17.2 does not validate a user-supplied value used to select a file to include, allowing unauthenticated attackers to include and read arbitrary local files, including the WordPress configuration file.

Defensive priority

Defenders should prioritize verifying the version of the Ultimate Multisite plugin and ensuring it is updated to 2.17.2 or later.

Recommended defensive actions

  • Verify the version of the Ultimate Multisite plugin and update to 2.17.2 or later
  • Monitor for potential exploitation attempts
  • Review server logs for suspicious activity

Evidence notes

The CVE record and source item provide information about the vulnerability, but there is limited information about the impact and exploitation. The source item and CVE Program record indicate the plugin version and CVE metadata. Supplemental sources may provide additional information about the vulnerability. Defenders should verify the plugin version and review server logs for suspicious activity.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-107508 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-107508

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

  • CVE-2026-107508 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-107508

    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.