CVE-2025-31891
📋 TL;DR
This stored cross-site scripting (XSS) vulnerability in the Gosign Posts Slider Block WordPress plugin allows attackers to inject malicious scripts into web pages. When users view pages containing the compromised slider, their browsers execute the attacker's code. All WordPress sites using vulnerable versions of this plugin are affected.
💻 Affected Systems
- Gosign Posts Slider Block WordPress Plugin
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator session cookies, take over WordPress sites, redirect users to malicious sites, or deploy additional malware payloads.
Likely Case
Attackers inject malicious JavaScript to steal user session cookies, perform actions on behalf of authenticated users, or deface website content.
If Mitigated
With proper input validation and output encoding, malicious scripts would be neutralized before reaching users' browsers.
🎯 Exploit Status
Stored XSS vulnerabilities are commonly exploited. While no public proof-of-concept exists, the vulnerability type is well-understood and easily weaponized.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.1.1 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find 'Gosign Posts Slider Block'. 4. Click 'Update Now' if available. 5. Alternatively, download version 1.1.1+ from WordPress repository and manually update.
🔧 Temporary Workarounds
Disable or Remove Plugin
allTemporarily disable or remove the vulnerable plugin until patched
wp plugin deactivate gosign-posts-slider-block
wp plugin delete gosign-posts-slider-block
Implement WAF Rules
allConfigure web application firewall to block XSS payloads targeting the plugin
🧯 If You Can't Patch
- Disable the Gosign Posts Slider Block plugin immediately
- Implement strict Content Security Policy (CSP) headers to mitigate XSS impact
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin > Plugins > Installed Plugins for 'Gosign Posts Slider Block' version 1.1.0 or earlierCheck Version:
wp plugin get gosign-posts-slider-block --field=versionVerify Fix Applied:
Verify plugin version is 1.1.1 or later in WordPress admin panel📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to plugin endpoints
- JavaScript payloads in request parameters
- Multiple failed XSS attempts
Network Indicators:
- Inbound requests containing script tags or JavaScript payloads
- Outbound connections to suspicious domains after page load
SIEM Query:
source="wordpress.log" AND "gosign" AND ("script" OR "javascript" OR "onload" OR "onerror")