CVE-2025-61931
📋 TL;DR
Pleasanter contains a stored cross-site scripting vulnerability in Body, Description, and Comments fields that allows attackers to inject malicious scripts. When a logged-in user views content containing these scripts, the attacker can execute arbitrary code in the user's browser. This affects all Pleasanter users who can access these content fields.
💻 Affected Systems
- Pleasanter
⚠️ 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 session cookies, perform actions as authenticated users, redirect to malicious sites, or install malware on user systems.
Likely Case
Session hijacking, credential theft, or unauthorized actions performed in the context of authenticated users.
If Mitigated
Limited impact with proper input validation and output encoding, though some functionality disruption may occur.
🎯 Exploit Status
Requires ability to inject content into Body, Description, or Comments fields. Exploitation depends on users viewing the malicious content.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version released October 24, 2025
Vendor Advisory: https://pleasanter.org/archives/vulnerability-update-20251024
Restart Required: No
Instructions:
1. Backup your Pleasanter instance. 2. Download the latest version from the official Pleasanter website. 3. Follow the upgrade instructions provided in the vendor advisory. 4. Verify the update was successful by checking the version number.
🔧 Temporary Workarounds
Input Validation and Sanitization
allImplement server-side input validation and output encoding for Body, Description, and Comments fields
Implement content security policies
Add input validation rules for user-generated content
Content Security Policy (CSP)
allImplement strict CSP headers to restrict script execution
Content-Security-Policy: default-src 'self'; script-src 'self'
🧯 If You Can't Patch
- Disable user-generated content in Body, Description, and Comments fields
- Implement web application firewall rules to block XSS payloads
🔍 How to Verify
Check if Vulnerable:
Check if your Pleasanter version is older than the October 24, 2025 update. Test by attempting to inject basic XSS payloads into content fields.Check Version:
Check the Pleasanter admin panel or configuration files for version informationVerify Fix Applied:
After patching, test that XSS payloads are properly sanitized and do not execute when viewed. Verify the version number matches the patched release.📡 Detection & Monitoring
Log Indicators:
- Unusual content submissions with script tags
- Multiple failed content validation attempts
- Suspicious user activity patterns
Network Indicators:
- Requests containing common XSS payload patterns
- Unexpected script loading from user-generated content
SIEM Query:
source="pleasanter_logs" AND (message="script" OR message="javascript:" OR message="onerror=" OR message="onload=")