Background: what was disclosed

On 15 August 2025 a public advisory recorded CVE-2025-7686 involving the “weichuncai (WP伪春菜)” WordPress plugin in versions up to 1.5. The core issue: one or more plugin endpoints accept inputs that are persisted and later rendered to site visitors without proper context-sensitive escaping, and those endpoints can be reached via forged requests (CSRF). Because the endpoints do not correctly verify request origin or user intent, an attacker can cause a victim site to store malicious script content. When other visitors load pages containing that stored data, the script executes in their browsers.

• Affected plugin: weichuncai (WP伪春菜)
• Affected versions: ≤ 1.5
• Vulnerability types: CSRF chaining to Stored XSS
• Privilege required: Unauthenticated
• CVE: CVE-2025-7686
• Fix status at disclosure: No official fix available

Vulnerability overview (technical summary)

This issue is a two-part failure:

1. CSRF: The plugin exposes a state-changing endpoint without sufficient CSRF protections. On WordPress the standard mechanism is to require and verify a nonce for any state-changing action reachable from a browser. If that check is missing or broken, a remote attacker can trick a user into submitting a request to the vulnerable endpoint.
2. Stored XSS: The same endpoint allows attacker-controlled input to be stored (database, postmeta, options, etc.) and later rendered without proper escaping for the HTML/JavaScript context. Stored data rendered unsafely to users’ browsers creates stored XSS.

Why the combination is critical: CSRF allows injection without authenticated access (or by leveraging a low-privilege user), and the stored XSS executes whenever visitors load the affected page — enabling session theft, admin takeover, malware delivery, SEO spam, or persistent defacement.

Why CSRF chaining to stored XSS matters

From an operational perspective, this combination significantly raises exploitability:

• Unauthenticated injection: If endpoints accept unauthenticated requests, attackers can directly inject payloads.
• Broad impact: Stored XSS affects all visitors of the page rendering the payload: users, editors, administrators, crawlers.
• Stealth and persistence: Payloads can be hidden in generic DB fields and survive updates.
• Automation: Attackers can mass-scan and mass-exploit sites running the vulnerable plugin.

Realistic attack scenarios and impact

Plausible exploitation scenarios:

1. Automated mass injection
   Attacker scans for sites with the plugin and sends crafted requests to store script payloads. Large-scale infection can occur in minutes.
2. Admin account takeover via session theft
   Stored XSS exfiltrates cookies or tokens, enabling attackers to reuse sessions to access admin panels.
3. SEO spam and malicious redirects
   Hidden spam links or client-side redirects can harm SEO and reputation.
4. Malware distribution
   Injected scripts load external payloads for drive-by downloads or crypto-mining.
5. Supply-chain or lateral movement
   With admin access, attackers can plant backdoors, modify plugins/themes, or add scheduled tasks to persist.

Impact varies by site traffic and audience — e-commerce and membership sites are particularly at risk.

How to detect if your site was exploited

Detection requires log review, content scanning, and database checks. Recommended steps:

1. Web server and access logs
   Search for unexpected POST/GET requests to plugin-specific endpoints around the disclosure date or earlier. Note IPs, user agents and timestamps typical of scanners.
2. Database search
   Inspect wp_posts, wp_postmeta, wp_options and plugin tables for HTML/JS fragments like
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