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Exploited vulnerability · CISA KEV

Is CVE-2025-49113 exploited? Yes: in CISA KEV since 20 Feb 2026

Gociux · Roundcube Webmail · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2025-49113, RoundCube Webmail Deserialization of Untrusted Data Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 20 Feb 2026, 263 days after it was published. It affects Roundcube Webmail. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 20 Feb 2026
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity9.9CVSS 3.1 · critical
US federal due13 Mar 2026BOD 22-01 deadline

What it is

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.

VendorRoundcube (11 exploited CVEs in KEV)
ProductWebmail
VulnerabilityRoundCube Webmail Deserialization of Untrusted Data Vulnerability
WeaknessCWE-502
Published2 Jun 2025
Added to KEV20 Feb 2026
Reported by (CNA)mitre

What to do

  1. Check whether you run it. Look for Webmail in your asset inventory, including appliances and cloud images. Stack check lists every exploited Roundcube CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 2 Jun 2025.
  4. Get told next time. Email alerts when CISA adds a CVE for Roundcube.

Other exploited CVEs in Webmail

References

Questions

Is CVE-2025-49113 being exploited?

Yes. CISA added CVE-2025-49113 to the Known Exploited Vulnerabilities catalog on 20 Feb 2026, which means there is reliable evidence of exploitation in the wild.

Is CVE-2025-49113 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2025-49113?

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Check Roundcube's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Webmail and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in February 2026 · Roundcube scorecard · act-now radar.

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