If you have not changed your Nitro password since 2020, or if you reused that same password on any other platform, change it immediately. Ensure all new passwords are long, complex, and unique. Enable Multi-Factor Authentication (MFA)
The massive Nitro PDF data breach originated in September 2020
In October 2020, Nitro Software released a statement confirming it had experienced a "low-impact security incident." The company initially claimed that no customer data was impacted.
With access to specific document titles and employee names, hackers could craft highly convincing phishing emails. An employee receiving an email asking them to "re-verify" a specific, real document title they worked on weeks prior is highly likely to fall for the trap. Corporate Espionage
Threat actors breached an online database used primarily to log Nitro’s free online document conversion services. nitro pdf data breach
was being auctioned alongside user credentials on the dark web. securityaffairs.com Timeline of Events Data Breach - Nitro Sign
The breach impacted:
Users must avoid reusing identical passwords across multiple personal and corporate platforms to nullify the threat of credential stuffing.
Full names, email addresses, bcrypt-hashed passwords, company names, and IP addresses. If you have not changed your Nitro password
Armed with your name, company, and email address, hackers can craft highly convincing phishing emails. For example, a scammer might send an email pretending to be Nitro PDF support, asking you to click a link to "verify your account details due to a security update." 2. Credential Stuffing Attacks
After failing to secure a private buyer for the entire cache, the threat actors leaked a massive portion of the stolen database—totaling roughly 14 gigabytes—onto a public hacker forum for free. This made the data accessible to low-level cybercriminals globally. 2. What Data Was Stolen?
Nitro continues to release security patches to address secondary vulnerabilities like certificate validation bypasses (CVE-2025-67825). Lessons and Remediation
Enterprise security teams should deploy automated monitoring tools that scan the dark web for corporate email domains. Identifying leaked credentials the moment they appear on hacker forums allows IT departments to force immediate password resets before attackers can exploit them. Strict Vendor Risk Management (VRM) With access to specific document titles and employee
Organizations should automate the deletion of files uploaded to cloud-based PDF or e-signing tools. Documents should not sit in a vendor's cloud container indefinitely after a transaction or signature is complete.
The Nitro PDF data breach is a stark reminder of the importance of cybersecurity in today's digital age. As businesses and individuals, we must take proactive steps to protect ourselves and our sensitive information. By prioritizing cybersecurity, using strong passwords, and being cautious of phishing attempts, we can reduce the risk of falling victim to cyber attacks. The Nitro PDF breach serves as a wake-up call for all of us to take action and protect ourselves in the face of an ever-evolving threat landscape.
In September 2020, Nitro Software, the company behind Nitro PDF and the Nitro Sign e-signature service, experienced a security incident that resulted in unauthorized access to its user databases. While the breach occurred in late 2020, its full scope, including the sale of the stolen data, became public knowledge in .
The lesson for every other cloud-first company is clear: And “we have no evidence of malicious access” is not a defense—it’s an admission of blindness.