CVE-2025-26260
📋 TL;DR
Plenti versions up to 0.7.16 are vulnerable to remote code execution via the /postLocal endpoint. Attackers can upload .svelte files with malicious JavaScript code in the filename, which the server executes on the host. This affects all Plenti users with the vulnerable endpoint exposed.
💻 Affected Systems
- Plenti
📦 What is this software?
Plenti by Plenti
⚠️ Risk & Real-World Impact
Worst Case
Full server compromise allowing attackers to execute arbitrary commands, steal data, install malware, or pivot to other systems.
Likely Case
Unauthorized code execution leading to data exfiltration, service disruption, or backdoor installation.
If Mitigated
Limited impact if endpoint is properly restricted, but still poses significant risk if exploited.
🎯 Exploit Status
Exploitation requires access to the /postLocal endpoint and knowledge of the vulnerability, but no authentication bypass is needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v0.7.17
Vendor Advisory: https://github.com/plentico/plenti/security/advisories/GHSA-mj4v-hp69-27x5
Restart Required: No
Instructions:
1. Update Plenti to version 0.7.17 or later. 2. Run 'npm update plenti' or equivalent package manager command. 3. Verify the update completed successfully.
🔧 Temporary Workarounds
Disable /postLocal endpoint
allRemove or restrict access to the vulnerable endpoint if not required.
Configure firewall rules to block access to /postLocal endpoint
Modify Plenti configuration to disable the endpoint
🧯 If You Can't Patch
- Implement strict input validation for file uploads, rejecting any filenames containing executable code.
- Deploy a web application firewall (WAF) with rules to detect and block malicious file upload patterns.
🔍 How to Verify
Check if Vulnerable:
Check Plenti version: if version <= 0.7.16 and /postLocal endpoint is accessible, the system is vulnerable.Check Version:
plenti --version or check package.json for versionVerify Fix Applied:
Verify Plenti version is 0.7.17 or later and test that malicious .svelte file uploads no longer execute code.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to /postLocal endpoint
- .svelte files with suspicious filenames containing JavaScript code
- Unexpected process execution following file uploads
Network Indicators:
- HTTP POST requests to /postLocal with .svelte files
- Unusual outbound connections from Plenti server after uploads
SIEM Query:
source="plenti" AND (url_path="/postLocal" OR file_extension=".svelte")🔗 References
- https://ahmetakan.com/2025/02/14/cve-2025-26260/
- https://github.com/ahmetak4n/vulnerability-playground/tree/main/vulnerability-research/CVE-2025-26260
- https://github.com/plentico/plenti/releases/tag/v0.7.17
- https://github.com/plentico/plenti/security/advisories/GHSA-mj4v-hp69-27x5
- https://github.com/plentico/plenti/security/advisories/GHSA-mj4v-hp69-27x5
