CVE-2023-2533 PaperCut NG/MF: web page flaw
In plain words: A web app can be made to act on someone's behalf or reach places it should not. Stolen sessions, actions taken as the victim, or access to internal systems.
Confirmed exploited by CISA on · US federal patch deadline Aug 18, 2025
What to do
- Install PaperCut's security update for NG/MF. If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Keep a list of every internet-facing server you run so nothing is forgotten.
- Patch anything in this catalog first, ahead of normal patch cycles.
- Put admin and file-transfer apps behind a VPN or single sign-on instead of the open internet.
Who is affected
Work IT. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.
What's at risk: Mass data theft and ransomware: a single flaw in a file-transfer or email server has exposed thousands of organisations at once.
The details
- Official name
- PaperCut NG/MF Cross-Site Request Forgery (CSRF) Vulnerability
- Product
- PaperCut NG/MF
- CISA description
- PaperCut NG/MF contains a cross-site request forgery (CSRF) vulnerability, which, under specific conditions, could potentially enable an attacker to alter security settings or execute arbitrary code.
- Type of flaw
- Web page flaw (CWE-352)
- Confirmed exploited
- Jul 28, 2025
- US federal patch deadline
- Aug 18, 2025
Ask Cleus about it
Ask about a vulnerability, an update, a weird message, or the news. Plain-word answers, free, no account.
Answering about CVE-2023-2533 ·
Questions about CVE-2023-2533
Is CVE-2023-2533 being exploited?
Yes. CISA added CVE-2023-2533 to its Known Exploited Vulnerabilities catalog on Jul 28, 2025, which means there is reliable evidence of real-world attacks.
How do I fix CVE-2023-2533?
Install PaperCut's security update for NG/MF. If no update exists, follow the vendor's workaround or stop using the product until one ships. Keep a list of every internet-facing server you run so nothing is forgotten.
Am I affected by CVE-2023-2533?
Only if you use PaperCut NG/MF. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.