CVE-2025-49113 is a critical-severity (CVSS 9.9) Deserialization of Untrusted Data vulnerability in roundcube/roundcubemail. It is in CISA's Known Exploited Vulnerabilities catalog (added 2026-02-20) — treat it as actively exploited and patch now. A fix is available for roundcube/roundcubemail — see the affected versions and patch details below.
Roundcube Webmail Vulnerable to Authenticated RCE via PHP Object Deserialization
Exploitation Status
Actively exploited in the wild
- Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2026-02-20. Federal agencies were required to remediate by 2026-03-13.
- A successful exploit gives an attacker total control of the affected component, not partial access.
Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2025-49113.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2025-49113 by exploitation likelihood (EPSS) against impact (CVSS). In the shaded patch-first corner (EPSS 50%+, CVSS 7.0+).
Where this sits among everything scored
Of 394,803 CVEs with a current EPSS score, this one falls in the ≥ 90% band (highlighted). Counts from FIRST.org, log-scaled.
Real-World Exposure
roundcube/roundcubemail🐘roundcube/roundcubemailReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.
Description
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.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | roundcube/roundcubemail | all versions | 1.5.10composer require roundcube/roundcubemail:^1.5.10 |
| 🐘Packagist | roundcube/roundcubemail | ≥ 1.6.0&&< 1.6.11 | 1.6.11composer require roundcube/roundcubemail:^1.6.11 |
Affected Products
debian linuxdebianwebmailroundcubeResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Roundcube 1.6.10 - Remote Code Execution (RCE)
by Maksim Rogov · Jun 13, 2025
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for roundcube/roundcubemail, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update roundcube/roundcubemail to 1.5.10 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2025-49113 is resolved across your whole dependency graph.
Workarounds
Do not deserialise data from untrusted sources: where the format allows it, restrict deserialisation to an explicit allowlist of expected types, and prefer a data-only format (JSON, Protobuf) over one that can reconstruct arbitrary objects until you can upgrade.
How to detect CVE-2025-49113
A community-maintained Nuclei template exists for this CVE. You can scan for it directly:
nuclei -id cve-2025-49113 -u https://target- Template
- Roundcube Webmail - Remote Code Execution
- Severity
- critical
- Impact
- Authenticated attackers can exploit unsafe deserialization in file upload handling to execute arbitrary PHP code, achieving complete server compromise.
- Remediation
- Upgrade Roundcube Webmail to version 1.5.10, 1.6.11, or later that properly validates deserialization operations.
Template by ProjectDiscovery nuclei-templates (rootxharsh, iamnoooob, pdresearch), MIT licensed. View the full template. Scan only systems you are authorised to test.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
Red Hat has evaluated this vulnerability and its related components. No products are affected as Roundcube Webmail is not shipped in the Red Hat Product Portfolio.
To mitigate this vulnerability, update Roundcube Webmail to version 1.5.10 or 1.6.11, which addresses the issue by properly validating the _from parameter in upload.php.Source: Red Hat security advisory for CVE-2025-49113 (CC BY 4.0)
Frequently Asked Questions
Is CVE-2025-49113 in your dependencies?
Find it across Packagist, including transitive dependencies.