CVE-2025-49113 — RoundCube Webmail Deserialization of Untrusted Data Vulnerability

Roundcube Webmail before 1.5.10 and 1.6.x before 1.6.11 allows remote code execution by authenticated users because the _from parameter in a URL is not validated in program/actions/settings/upload.php, leading to PHP Object Deserialization.

01What is this vulnerability?

Roundcube Webmail before 1.5.10 and 1.6.x before 1.6.11 allows remote code execution by authenticated users because the _from parameter in a URL is not validated in program/actions/settings/upload.php, leading to PHP Object Deserialization.

02Affected products

Vendor	Product	Versions
Roundcube	Webmail	0, 1.6.0

03Active exploitation status

Yes — actively exploited. Added to the CISA KEV catalog on 2026-02-20. Ransomware use: Unknown.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

Open in Sigma generator →

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2025-06-02T00:00:00.000Z
• Last modified: 2026-02-21T04:56:23.141Z
• Added to CISA KEV: 2026-02-20
• BOD 22-01 due: 2026-03-13

09References

• roundcube.net — https://roundcube.net/news/2025/06/01/security-updates-1.6.11-and-1.5.10
• github.com — https://github.com/roundcube/roundcubemail/pull/9865
• github.com — https://github.com/roundcube/roundcubemail/releases/tag/1.6.11
• github.com — https://github.com/roundcube/roundcubemail/commit/0376f69e958a8fef7f6f09e352c541…
• github.com — https://github.com/roundcube/roundcubemail/releases/tag/1.5.10
• github.com — https://github.com/roundcube/roundcubemail/commit/7408f31379666124a39f9cb1018f62…
• github.com — https://github.com/roundcube/roundcubemail/commit/c50a07d88ca38f018a0f4a0b008e9a…
• fearsoff.org — https://fearsoff.org/research/roundcube
• www.vicarius.io — https://www.vicarius.io/vsociety/posts/cve-2025-49113-roundcube-vulnerability-de…
• www.vicarius.io — https://www.vicarius.io/vsociety/posts/cve-2025-49113-roundcube-mitigation-scrip…