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CVE-2026-104755 medium CVSS 4.8

Privilege Escalation in WP Compress – Instant Performance & Speed Optimization (WordPress plugin) (CVE-2026-104755)

Summary

Vulnerability in WP Compress – Instant Performance & Speed Optimization (WordPress plugin) (CVE-2026-104755). Risk of unauthorized operations or information disclosure. Exploitable via start_comms.

Original description

The description as published by the source.

The WP Compress – Instant Performance & Speed Optimization plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 7.25.00 The vulnerability exists because the start_comms dispatcher (wps_ic_comms::start_comms), hooked on every front-end request, gates access only by comparing the caller-supplied apikey parameter against the stored plugin API key with no WordPress capability check and no nonce verification, then passes the unvalidated group, setting, and value parameters directly to change_setting(), which writes them into the WPS_IC_SETTINGS option without an allow-list. This makes it possible for unauthenticated attackers to write arbitrary permission keys into the plugin's settings, causing wps_ic_users::checkAndAddCaps() to grant any WordPress role — including Subscriber — the manage_wpc_settings capability and thereby achieve plugin-administrator-equivalent control over the plugin's optimization, CDN, and critical-CSS surfaces. The API key required to pass the authorization check can itself be obtained without authentication via the wpc_send_critical_remote nopriv AJAX action: when the external critical-CSS service returns an apiResults field, initCritical() echoes the stored plugin API key back to the caller in a wp_send_json_success response, completing the exploit chain entirely without a WordPress login.

Source: GitHub Security Advisories (Global) NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-104755 has been found in WP Compress – Instant Performance & Speed Optimization (WordPress plugin).
Attackers can target a specific entry point like start_comms over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 4.8/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "WP Compress – Instant Performance & Speed Optimization (WordPress plugin) CVE-2026-104755" on the vendor's site.

CVE-2026-104755 (WP Compress – Instant Performance & Speed Optimization (WordPress plugin)) — CWE-269 / CVSS v3 4.8
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: start_comms / apikey / group / setting
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (CWE-269) exists in WP Compress – Instant Performance & Speed Optimization (WordPress plugin). Attackers reach the vulnerable code path via start_comms without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of WP Compress – Instant Performance & Speed Optimization (WordPress plugin). Attack surface: start_comms / apikey / group / setting.

🔥 Severity

Severity: Medium (CVSS 4.8/10). Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to the patched release per vendor advisory.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    Audit SBOM/dependencies for affected components.

    資産台帳・SBOM・依存マニフェストで WP Compress – Instant Performance & Speed Optimization (WordPress plugin) を使っているサービスとバージョンを洗い出す。

  2. 2
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

References

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