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CVE-2026-84757 – Unauthenticated Settings Modification – WP Compress <= 7.21.28

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Summary

CVE-2026-84757 is a Missing Authorization vulnerability (CWE-862) in the WP Compress WordPress plugin (developed by AresIT) affecting versions up to and including 7.21.28. The flaw allows an unauthenticated attacker to modify plugin settings over the network without any user interaction. It carries a CVSS v3.1 base score of 8.2 (High).

Technical details

  • Root cause: one or more plugin functions that change WP Compress configuration settings lack proper authorization/capability checks.
  • Trigger conditions: an attacker sends a request to the vulnerable settings-handling endpoint on a WordPress site running an affected WP Compress version; no authentication or prior user interaction is required.
  • Attack vector: network-based, exploitable remotely against any internet-exposed WordPress site with the vulnerable plugin active.
  • Impact: unauthorized modification of plugin settings, resulting in an integrity impact and a low availability impact to the site; no direct confidentiality impact is indicated by the CVSS vector.

Affected software

  • WP Compress (wp-compress-image-optimizer) WordPress plugin, versions up to and including 7.21.28.

Severity

  • CVSS v3.1 Base Score: 8.2 (High)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L

Mitigation and recommended actions

  • Immediate: Update the WP Compress plugin to version 7.22.0 or later, where the missing authorization checks have been addressed.
  • If immediate patching is not possible: restrict or disable access to the plugin’s settings-related functionality, review site users and settings for unauthorized changes, and monitor for unexpected modifications to WP Compress configuration until the update can be applied.

How IONIX identifies potentially affected assets

IONIX matches the following signals against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • Raw response body: /wp-content/plugins/wp-compress-image-optimizer/

References

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Map your entire attack surface (continously)

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2

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3

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Not all CVEs matter. IONIX filters vulnerabilities by asking attacker-centric questions: Can it be reached from the internet? Does it require authentication? Is it being exploited in the wild? This dramatically reduces noise and focuses teams on threats that can actually be weaponized.

4

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IONIX transforms real-world PoCs into safe, non-intrusive test payloads that can be run in production environments without disruption. These simulations are precisely targeted to the systems that are vulnerable, ensuring rapid validation without unnecessary load.

5

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By combining context about software stack, versioning, exposure status, and reachability, IONIX ensures that only the right payloads are executed against the right assets, maximizing efficiency and minimizing risk.

6

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Results are routed through integrations with ticketing, SOAR, and SIEM tools. Issues are written in plain language, bundled into remediation clusters, and prioritized based on asset criticality, exploitability, and blast radius. This shortens mean time to remediation (MTTR) and empowers teams to act with confidence.

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