---
title: "CVE-2025-49113: RoundCube Webmail Deserialization of Untrusted Data Vulnerability"
url: https://erroneo.us/security/cve/CVE-2025-49113/
description: "CVE-2025-49113 (Roundcube Webmail): Exploited in the wild (CISA KEV). Roundcube Webmail before 1.5.10 and 1.6.x before 1.6.11 allows remote code execution…"
type: vulnerability-record
section: "Security Digest"
date_published: 2025-06-02
date_modified: 2026-02-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2025-49113"
kev: true
cvss: 9.9
epss: 0.98972
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2025-49113: RoundCube Webmail Deserialization of Untrusted Data Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Roundcube Webmail. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-02-20, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-03-13 ; treat that as the outer limit, not the target.
- EPSS 99.0% , percentile 99.9: FIRST’s model estimates a 99.0% chance of exploitation activity in the next 30 days, higher than 99.9% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Needs an account (low (any account)). Exposure depends on who can log in.
- Only applies if your dependency tree includes roundcube/roundcubemail (Composer (PHP)) < 1.5.10, fixed in 1.5.10 ; roundcube/roundcubemail (Composer (PHP)) >= 1.6.0, < 1.6.11, fixed in 1.6.11 . Check your lockfile, including transitive dependencies.

## What it is

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

- Composer (PHP) `roundcube/roundcubemail` < 1.5.10 → fixed: 1.5.10
- Composer (PHP) `roundcube/roundcubemail` >= 1.6.0, < 1.6.11 → fixed: 1.6.11

## Affected products (CVE record)

- Roundcube Webmail: < 1.5.10, 1.6.0 < 1.6.11

## Severity

- mitre CVSS 3.1: 9.9 `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H`
- GitHub CVSS 3.1: 9.9 `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H`

## Exploitation

- CISA KEV: added 2026-02-20; federal due date 2026-03-13. Known ransomware use: Unknown.
- CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 98.97% probability of exploitation activity in the next 30 days; percentile 99.9.

## Sources

- [Listed in CISA KEV notes (roundcube.net)](https://roundcube.net/news/2025/06/01/security-updates-1.6.11-and-1.5.10)
- [Listed in CISA KEV notes (github.com)](https://github.com/roundcube/roundcubemail/releases/tag/1.5.10)
- [Listed in CISA KEV notes (github.com)](https://github.com/roundcube/roundcubemail/releases/tag/1.6.11)
- [GitHub Advisory GHSA-8j8w-wwqc-x596](https://github.com/advisories/GHSA-8j8w-wwqc-x596)
- [CVE.org record CVE-2025-49113](https://www.cve.org/CVERecord?id=CVE-2025-49113)
- [NVD entry CVE-2025-49113](https://nvd.nist.gov/vuln/detail/CVE-2025-49113)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-49113)
- [github.com](https://github.com/roundcube/roundcubemail/pull/9865)
- [github.com](https://github.com/roundcube/roundcubemail/commit/0376f69e958a8fef7f6f09e352c541b4e7729c4d)
- [github.com](https://github.com/roundcube/roundcubemail/commit/7408f31379666124a39f9cb1018f62bc5e2dc695)
- [github.com](https://github.com/roundcube/roundcubemail/commit/c50a07d88ca38f018a0f4a0b008e9a1deb32637e)
- [fearsoff.org](https://fearsoff.org/research/roundcube)
- [vicarius.io](https://www.vicarius.io/vsociety/posts/cve-2025-49113-roundcube-vulnerability-detection)
- [vicarius.io](https://www.vicarius.io/vsociety/posts/cve-2025-49113-roundcube-mitigation-script)
- [openwall.com](http://www.openwall.com/lists/oss-security/2025/06/02/3)
- [lists.debian.org](https://lists.debian.org/debian-lts-announce/2025/06/msg00008.html)

---
Source page: https://erroneo.us/security/cve/CVE-2025-49113/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt