[News](/news) Data breach reported for Sellers Publishing [Blog](/blog)[Breaches](/breaches)[Resources](/resources)[News](/news) # Data breach reported for Sellers Publishing ##### [UpGuard Team](/team/upguard) March 12, 2026 ### Key Facts: RSVP Data Breach * **Date reported:** March 10, 2026. * **Unauthorized access identified:** November 4, 2025. * **Target entity:** RSVP (Sellers Publishing, Inc.). * **Source of breach:** Unknown, unauthorized third-party (hacking event). * **Data types:** Names and Social Security numbers. * **Status:** Confirmed; investigation concluded that unauthorized access resulted in information exposure. * **Severity:** Medium; while the scope of the system compromise was contained, the exposure of Social Security numbers carries high sensitivity and risk for identity theft. [Start continuous breach monitoring with UpGuard.](https://www.upguard.com/product/breach-risk/threat-monitoring) ## What happened in the RSVP data breach? RSVP (rsvp.com) reported an external system breach on March 10, 2026. The incident, classified as a hacking event, did not identify a specific threat actor at the time of the public disclosure. The breach was discovered several months prior to the report date, following the detection of suspicious activity on the company's internal systems. On November 4, 2025, Sellers Publishing, Inc. (RSVP) identified unusual activity that led to an investigation into a system compromise. The investigation confirmed that unauthorized access resulted in the exposure of personal information, specifically names and Social Security numbers. This incident is considered medium severity due to the high sensitivity of the data categories involved. Unauthorized access to such information typically increases the risk of identity theft and targeted phishing attempts for those affected. ## Who is behind the incident? The attacker or cause of the incident has not been identified. ## Impact and risks for RSVP customers For individuals associated with RSVP, the exposure of names and Social Security numbers presents significant security risks. Malicious actors can potentially use this information to conduct identity theft, open fraudulent accounts, or launch sophisticated phishing campaigns. Although the specific intent of the attackers remains unknown, the sensitivity of Social Security numbers necessitates immediate and long-term vigilance from all affected parties. Incidents involving government-issued identifiers often lead to prolonged risks of financial fraud. Individuals should consider freezing their credit and monitoring their financial statements for any unauthorized transactions. Maintaining transparency regarding these security events is a critical step in helping users mitigate potential harm. ## How to protect against similar security incidents [Get instant alerts](https://www.upguard.com/product/breach-risk/threat-monitoring) when your data appears on the dark web ## Frequently Asked Questions ### What happened in the RSVP security breach? On March 10, 2026, RSVP (rsvp.com) disclosed a security breach. According to initial reports, Sellers Publishing, Inc. discovered unusual activity on their system on November 4, 2025, which was later confirmed as an external hacking incident that exposed personal information. ### When did the RSVP breach occur? The RSVP breach was publicly reported on March 10, 2026. The exact date of the attack has not been disclosed, though unusual activity was first detected on November 4, 2025. ### What data was exposed? The types of data involved in the RSVP incident include names and Social Security numbers. ### Is my personal information at risk? If you interacted with RSVP, there's a possibility your personal information could be affected. Similar incidents often involve email addresses, login details, or financial records. Stay alert for updates and take precautionary measures to secure your accounts. ### How can I protect myself after a data breach? * Change your account passwords immediately * Enable [multi-factor authentication (MFA)](https://www.upguard.com/blog/mfa-multi-factor-authentication) * Monitor your financial statements and credit reports * Be cautious of unsolicited communications or phishing attempts * Use data breach monitoring services ### What steps should companies take after being breached? RSVP has indicated they implemented measures to prevent future incidents. Typically, companies in this situation secure their systems, notify affected parties, provide guidance on protective actions, and review internal security protocols while deploying [attack surface management tools](https://www.upguard.com/product/breach-risk/attack-surface-management). ## How secure is RSVP? RSVP.com is the retail website for Sellers Publishing products, which include calendars, greeting cards, and stationery products. * View our free preliminary report on RSVP’s security posture * 13 risk factors, including email security, SSL, DNS health, open ports and common vulnerabilities [View RSVP's score](/security-report/rsvp) [View score](/security-report/rsvp) [https://www.rsvp.com/](/security-report/rsvp) ### Sign up for our newsletter UpGuard's monthly newsletter cuts through the noise and brings you what matters most: our breaking research, in-depth analysis of emerging threats, and actionable strategic insights. ## Latest news Stay up-to-date with the latest news in cybersecurity. [](/news/hugging-face-data-breach-2026-07-20) #### [Hugging Face data breach: key facts and what we know so far](/news/hugging-face-data-breach-2026-07-20) A data breach involving Hugging Face was reported in July 2026. 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