{"id":133918,"date":"2025-11-20T12:17:01","date_gmt":"2025-11-20T12:17:01","guid":{"rendered":"https:\/\/cybersecuritynews.com\/?p=133918"},"modified":"2025-11-20T12:17:05","modified_gmt":"2025-11-20T12:17:05","slug":"microsoft-office-0-day-rce-claim","status":"publish","type":"post","link":"https:\/\/cybersecuritynews.com\/microsoft-office-0-day-rce-claim\/","title":{"rendered":"Threat Actors Allegedly Selling Microsoft Office 0-Day RCE Vulnerability on Hacking Forums"},"content":{"rendered":"\n<p>A threat actor known as Zeroplayer has reportedly listed a zero-day remote code execution (RCE) vulnerability, combined with a sandbox escape, targeting Microsoft Office and Windows systems for sale on underground hacking forums.<\/p>\n\n\n\n<p>Priced at $30,000, the exploit purportedly works on most Office file formats, including the latest versions, and affects fully patched Windows installations.<\/p>\n\n\n\n<p>This development raises alarms in the cybersecurity community, as it could enable attackers to bypass Microsoft&#8217;s robust sandbox protections and execute arbitrary code with minimal user interaction.<\/p>\n\n\n\n<p>The advertisement, posted in Russian on a prominent hacking forum, describes the vulnerability as a high-impact 0-day capable of delivering payloads through malicious Office documents.<\/p>\n\n\n\n<p>Zeroplayer claims the exploit chain allows remote attackers to escape the Office sandbox a critical security feature designed to isolate potentially harmful code\u2014and achieve full system compromise on Windows.<\/p>\n\n\n\n<p>Delivery methods involve embedding the exploit in common file types like Word or Excel documents, which could be distributed via phishing emails or compromised websites.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/blogger.googleusercontent.com\/img\/b\/R29vZ2xl\/AVvXsEinr5w2NLNIfn9klPbQC-hnyOV-DbvtCzKN0pjlDjrrfk34Ji2Ez6vVtzEFgTVhr_pQYQCJiyCY7eDeR7yrEJsWJpR0y-BTexZRI3Gx60zksfSMyX93FVBk9AagZ3iIyjo580QzJfJxY1sTmGtQzkypL4S0XQtQJ4Ztwq6EkArot_rAiYlMj9QNaMZinjEt\/s16000\/Microsoft%20Office%200-Day%20RCE%20Vulnerability.webp\" alt=\"Microsoft Office 0-Day RCE Claim\"\/><figcaption class=\"wp-element-caption\">Alleged Microsoft Office 0-Day Claim<\/figcaption><\/figure><\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"details-of-the-forum-listing\"><strong>Details of the Hacker Forum Listing<\/strong><\/h2>\n\n\n\n<p>The seller invites private messages for demonstrations and proof-of-concept details, emphasizing compatibility with recent updates to mitigate detection by antivirus tools.<\/p>\n\n\n\n<p>This isn&#8217;t Zeroplayer&#8217;s first foray into the exploit market; the actor previously offered a <a href=\"https:\/\/cybersecuritynews.com\/cisa-added-winrar-zero-day-vulnerability\/\" target=\"_blank\" rel=\"noreferrer noopener\">WinRAR zero-day<\/a> RCE for $80,000 in July 2025, highlighting a pattern of targeting widely used productivity and archiving software.<\/p>\n\n\n\n<p>Such sales underscore the lucrative underground economy for zero-days, where exploits fetch premium prices before public disclosure or patching.\u200b<\/p>\n\n\n\n<p>Microsoft&#8217;s November 2025 Patch Tuesday addressed multiple critical RCE flaws in Office, including <a href=\"https:\/\/cybersecuritynews.com\/microsoft-november-2025-patch-tuesday\/\" target=\"_blank\" rel=\"noreferrer noopener\">CVE-2025-62199<\/a>, a use-after-free vulnerability exploitable via malicious documents.<\/p>\n\n\n\n<p>However, that patch focused on known issues and did not reference this alleged 0-day, suggesting it remains unpatched and potentially more dangerous due to its sandbox escape component.<\/p>\n\n\n\n<p>Sandbox escapes are particularly concerning, as they neutralize one of Office&#8217;s primary defenses against macro-based attacks, allowing malware to spread laterally across networks.\u200b<\/p>\n\n\n\n<p>Experts note that Russian-language forums like the one hosting this listing often serve as hubs for state-affiliated or opportunistic threat actors, who may weaponize such exploits for ransomware, espionage, or data theft.<\/p>\n\n\n\n<p>Similar past incidents, such as the 2023 exploitation of <a href=\"https:\/\/cybersecuritynews.com\/windows-zero-days-firefox-romcom-group\/\" target=\"_blank\" rel=\"noreferrer noopener\">CVE-2023-36884<\/a> by the Russian group Storm-0978, involved Office RCE for backdoor deployment against Western targets.\u200b<\/p>\n\n\n\n<p>The potential fallout from this 0-day is significant, especially for enterprises reliant on Microsoft 365. Attackers could leverage it to compromise supply chains or conduct targeted intrusions, evading endpoint detection responses.<\/p>\n\n\n\n<p>Given Office&#8217;s ubiquity across over 1.4 billion devices globally, unpatched systems face a heightened risk of infection through spear-phishing.\u200b<\/p>\n\n\n\n<p>Organizations should prioritize macro disabling in Office policies, enable Protected View for all documents, and deploy advanced threat protection tools.<\/p>\n\n\n\n<p>Monitoring for anomalous forum activity and applying upcoming patches urgently is advised, as Microsoft may accelerate fixes if exploitation evidence emerges.<\/p>\n\n\n\n<p class=\"has-text-align-center has-background\" style=\"background:linear-gradient(180deg,rgb(238,238,238) 94%,rgb(169,184,195) 100%)\"><strong>Follow us on <a href=\"https:\/\/news.google.com\/publications\/CAAqMggKIixDQklTR3dnTWFoY0tGV041WW1WeWMyVmpkWEpwZEhsdVpYZHpMbU52YlNnQVAB?hl=en-IN&amp;gl=IN&amp;ceid=IN:en\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">Google News<\/a>, <a href=\"https:\/\/www.linkedin.com\/company\/cybersecurity-news\/\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">LinkedIn<\/a>, and <a href=\"https:\/\/x.com\/cyber_press_org\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">X<\/a> for daily cybersecurity updates. <a href=\"https:\/\/cybersecuritynews.com\/contact-us\/\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">Contact us<\/a> to feature your stories.<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A threat actor known as Zeroplayer has reportedly listed a zero-day remote code execution (RCE) vulnerability, combined with a sandbox escape, targeting Microsoft Office and Windows systems for sale on underground hacking forums. Priced at $30,000, the exploit purportedly works on most Office file formats, including the latest versions, and affects fully patched Windows installations. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":133922,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"https:\/\/blogger.googleusercontent.com\/img\/b\/R29vZ2xl\/AVvXsEiVBuT1gFWbaXd6SN_iQkZxhIo4LGhVivPgpI3n7fuNf7j6Ei0eu3CZd7fVrJT8delfFkapVUP1WWkImYgOErufHc_UhiPm6-l1ZSZQUvVVPkkXo4os51-1LEa4ZgMpnt1bO9eHRS5r34HJKOtQ2E58K1yobRQfwCGr6TZlXnXLPAaW3A9lgGyEKT_hMzbc\/s16000\/Microsoft%20Office%200-Day%20RCE%20Claim.webp","fifu_image_alt":"Microsoft Office 0-Day RCE Claim","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[11,2737],"tags":[149,151],"class_list":{"0":"post-133918","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-cyber-security-news","8":"category-vulnerability-news","9":"tag-cyber-security","10":"tag-cyber-security-news"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin 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