CVE-2025-26506
📋 TL;DR
This vulnerability allows attackers to execute arbitrary code with elevated privileges on affected HP printers by sending malicious PostScript print jobs. It affects HP LaserJet Pro, Enterprise, and Managed printers. Attackers could potentially take full control of vulnerable printers remotely.
💻 Affected Systems
- HP LaserJet Pro
- HP LaserJet Enterprise
- HP LaserJet Managed Printers
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full printer compromise allowing attackers to install persistent malware, intercept print jobs, pivot to internal networks, or use printer as attack platform.
Likely Case
Printer compromise leading to data exfiltration, denial of service, or lateral movement within the network.
If Mitigated
Limited impact if printers are isolated, monitored, and have restricted network access.
🎯 Exploit Status
Exploitation requires sending PostScript print job to vulnerable printer. No authentication needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware updates specified in HP advisory HPSBPI04007
Vendor Advisory: https://support.hp.com/us-en/document/ish_11953771-11953793-16/hpsBPI04007
Restart Required: Yes
Instructions:
1. Identify printer model and current firmware version. 2. Download appropriate firmware update from HP support site. 3. Apply firmware update via printer web interface or HP tools. 4. Verify successful update and restart printer.
🔧 Temporary Workarounds
Disable PostScript
allDisable PostScript printing capability on affected printers
Access printer web interface > Security > Disable PostScript
Network Segmentation
allIsolate printers to separate VLAN with restricted access
🧯 If You Can't Patch
- Segment printers to isolated network segments with strict firewall rules
- Implement print server with job filtering to block malicious PostScript
🔍 How to Verify
Check if Vulnerable:
Check printer model and firmware version against HP advisory listCheck Version:
Access printer web interface > About or Settings > Firmware VersionVerify Fix Applied:
Verify firmware version matches patched version from HP advisory📡 Detection & Monitoring
Log Indicators:
- Unusual PostScript print jobs
- Failed firmware update attempts
- Printer reboot events
Network Indicators:
- PostScript print jobs from unusual sources
- Unexpected network traffic from printers
SIEM Query:
source="printer_logs" AND (event="postscript_error" OR event="firmware_change")