InfoSecBulletin Cybersecurity for mankind
More than 84,000 Roundcube webmail installations are at risk due to CVE-2025-49113, a severe remote code execution (RCE) vulnerability that comes with an available public exploit. The flaw in Roundcube (versions 1.1.0 to 1.6.10) was discovered by Kirill Firsov and was patched on June 1, 2025.
The bug stems from unsanitized $_GET[‘_from’] input, enabling PHP object deserialization and session corruption when session keys begin with an exclamation mark.
Nearly 100,000 email addresses exposed in first AI-related data breach in Singapore
Hackers Exploit Zimbra Mail Servers: TeamViewer patched 5 critical flaws
Google Warns of Hackers Actively Exploiting Citrix 0-Day Flaws
CISA Warns Critical MikroTik RouterOS Flaw While Cisco SD-WAN Zero-Day Exploited in Attacks
Apple Zero-Day Exploited: Pentagon Data Breach Reportedly Exposes Sensitive Data of 3 Million People
JadePuffer Agentic AI targets and destroys Azure’s cloud resources
“InfoSecCon-2026: Bangladesh’s Cybersecurity Leaders Unite to Shape a Safer Digital Future”
Microsoft Patches CVSS 10.0 Azure AI Foundry Vulnerability Allowing Privilege Escalation
AWS is unable to restore access to Bahrain, one UAE cloud data zone after war damage
Cisco Warns of Critical ISE 0-Day Flaw and Hackers Allegedly Selling Fortinet FortiGate 1-Day Flaw
Soon after the patch was out, hackers created a working exploit by reverse-engineering it and sold it on underground forums.
Though CVE-2025-49113 needs authentication to exploit, attackers assert they can acquire valid credentials using CSRF, log scraping, or brute-force methods.
Firsov shared technical details about the flaw on his blog to help defend against active exploitation attempts that are very likely to occur.
Massive exposure:
Roundcube is commonly used by web hosting providers and in sectors like government, education, and tech, with over 1,200,000 instances visible online.
As of June 8, 2025, The Shadowserver Foundation reports 84,925 vulnerable Roundcube instances related to CVE-2025-49113.
The majority of instances are located in the United States (19,500), India (15,500), Germany (13,600), France (3,600), Canada (3,500), and the United Kingdom (2,400). The risk of exploitation and data theft makes this a serious cybersecurity issue. Admins should upgrade to versions 1.6.11 and 1.5.10 to fix CVE-2025-49113 promptly.
Bleepingcomputer reported, It is unclear if the flaw is being leveraged in actual attacks and at what scale, but immediate action is advised nonetheless.
If upgrading is impossible, it is recommended to restrict access to webmail, turn off file uploads, add CSRF protection, block risky PHP functions, and monitor for exploit indicators.
