Over 84,000 Roundcube webmail installations are susceptible to CVE-2025-49113, a vital distant code execution (RCE) flaw with a public exploit.
The flaw, which impacts Roundcube variations 1.1.0 by means of 1.6.10, spanning over a decade, was patched on June 1, 2025, following its discovery and reporting by safety researcher Kirill Firsov.
The bug stems from unsanitized $_GET[‘_from’] enter, enabling PHP object deserialization and session corruption when session keys start with an exclamation mark.
Shortly after the patch was launched, hackers reverse-engineered it to develop a working exploit, which they offered on underground boards.
Although the exploitation of CVE-2025-49113 requires authentication, attackers declare that legitimate credentials will be obtained through CSRF, log scraping, or brute-forced.
Firsov shared technical particulars in regards to the flaw on his weblog to assist defend in opposition to energetic exploitation makes an attempt which can be very prone to happen.
Large publicity
Roundcube is extensively utilized in shared internet hosting (GoDaddy, Hostinger, OVH) and authorities, training, and tech sectors, with over 1,200,000 situations seen on-line.
Menace monitoring platform The Shadowserver Basis experiences that its web scans return 84,925 Roundcube situations susceptible to CVE-2025-49113 as of June 8, 2025.
Most of those situations are in the USA (19,500), India (15,500), Germany (13,600), France (3,600), Canada (3,500), and the UK (2,400).
Supply: The Shadowserver Basis
Contemplating the excessive threat of exploitation and the potential for knowledge theft, the publicity of these situations is a big cybersecurity threat.
System directors are really useful to replace to model 1.6.11 and 1.5.10, which tackle CVE-2025-49113, as quickly as doable.
It’s unclear if the flaw is being leveraged in precise assaults and at what scale, however rapid motion is suggested nonetheless.
If upgrading is unattainable, it is suggested to limit entry to webmail, flip off file uploads, add CSRF safety, block dangerous PHP capabilities, and monitor for exploit indicators.
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