EPSS Alert: The probability of this vulnerability being exploited in the next 30 days is 90.0% (percentile: 100%).
Summary
| Parameter | Value |
|---|---|
| CVE ID | CVE-2025-49113 |
| Alert Source | CISA KEV - Active Exploitation |
| CVE Publication Year | 2025 |
| Date Published | 2026-02-20 |
| Vendor | Roundcube |
| Product | Webmail |
| CVSS Score | 9.9 (critical) |
| EPSS Score | 90.0% (percentile: 100%) |
| CISA KEV | Yes - confirmed active exploitation |
| Ransomware | Not confirmed |
| Remediation Deadline | 2026-03-13 |
Vulnerability Description
RoundCube Webmail contains a deserialization of untrusted data vulnerability that allows remote code execution by authenticated users because the _from parameter in a URL is not validated in program/actions/settings/upload.php.
Required Actions
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
High Exploitation Risk
According to EPSS (Exploit Prediction Scoring System), the probability of this vulnerability being exploited within 30 days is very high (90.0%). We recommend prioritizing this update.
Who Is Affected?
This vulnerability affects Webmail by Roundcube. Check if your organization uses this software and requires updates.
Sources
Need help securing your systems? nFlo team offers vulnerability management and 24/7 SOC services. Contact us.
How can nFlo help?
If your organization uses products affected by this vulnerability, contact us. We can help with:
- Verifying whether your systems are at risk
- Implementing patches and risk mitigation
- Monitoring for exploitation attempts in your environment
Useful resources:
Related services and products
Frequently asked questions
What is CVE-2025-49113?
CVE-2025-49113 is a vulnerability discovered in Roundcube's Webmail. RoundCube Webmail contains a deserialization of untrusted data vulnerability that allows remote code execution by authenticated users because the _from parameter in a URL is not validated in program/a. The severity is rated as critical (CVSS: 9.9).
Who is affected by CVE-2025-49113?
This vulnerability affects users of Roundcube's Webmail. Any organization using this software should immediately verify whether their systems require patching or mitigation measures.
How can I protect against CVE-2025-49113?
Apply the security patches provided by Roundcube or implement the recommended mitigations. CISA has set a remediation deadline of 2026-03-13. If patches are unavailable, consider disabling the vulnerable component.
Why is CVE-2025-49113 classified as critical?
This vulnerability received a CVSS score of 9.9, classifying it as critical. This means it can be easily exploited by attackers and may lead to severe consequences such as system takeover, data theft, or service disruption.
Is CVE-2025-49113 actively exploited in the wild?
Yes, CISA has added this vulnerability to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in real-world attacks. Ransomware usage has not been confirmed yet, but the risk remains high.
