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.
Weakness
The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Webmail | Roundcube | * | 1.5.10 (excluding) |
| Webmail | Roundcube | 1.6.0 (including) | 1.6.11 (excluding) |
| Roundcube | Ubuntu | esm-apps/bionic | * |
| Roundcube | Ubuntu | esm-apps/focal | * |
| Roundcube | Ubuntu | esm-apps/jammy | * |
| Roundcube | Ubuntu | esm-apps/noble | * |
| Roundcube | Ubuntu | esm-apps/xenial | * |
| Roundcube | Ubuntu | focal | * |
| Roundcube | Ubuntu | jammy | * |
| Roundcube | Ubuntu | noble | * |
| Roundcube | Ubuntu | oracular | * |
| Roundcube | Ubuntu | plucky | * |
| Roundcube | Ubuntu | upstream | * |
Potential Mitigations
- Make fields transient to protect them from deserialization.
- An attempt to serialize and then deserialize a class containing transient fields will result in NULLs where the transient data should be. This is an excellent way to prevent time, environment-based, or sensitive variables from being carried over and used improperly.
Related Attack Patterns
References
- https://fearsoff.org/research/roundcube
- https://github.com/roundcube/roundcubemail/commit/0376f69e958a8fef7f6f09e352c541b4e7729c4d
- https://github.com/roundcube/roundcubemail/commit/7408f31379666124a39f9cb1018f62bc5e2dc695
- https://github.com/roundcube/roundcubemail/commit/c50a07d88ca38f018a0f4a0b008e9a1deb32637e
- https://github.com/roundcube/roundcubemail/pull/9865
- https://github.com/roundcube/roundcubemail/releases/tag/1.5.10
- https://github.com/roundcube/roundcubemail/releases/tag/1.6.11
- https://roundcube.net/news/2025/06/01/security-updates-1.6.11-and-1.5.10
- https://www.vicarius.io/vsociety/posts/cve-2025-49113-roundcube-mitigation-script
- https://www.vicarius.io/vsociety/posts/cve-2025-49113-roundcube-vulnerability-detection
- http://www.openwall.com/lists/oss-security/2025/06/02/3
- https://lists.debian.org/debian-lts-announce/2025/06/msg00008.html