CVE-2025-49113: Roundcube Webmail

Should you act?

Exploited: patch now if you run it

CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.

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.

From the GitHub advisory

CISA’s summary

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.

Weakness type: CWE-502.

Product: Roundcube Webmail · Assigned by: mitre · Published: 2025-06-02

Affected and fixed versions

Ecosystem	Package	Vulnerable	First fixed
Composer (PHP)	`roundcube/roundcubemail`	< 1.5.10	1.5.10
Composer (PHP)	`roundcube/roundcubemail`	>= 1.6.0, < 1.6.11	1.6.11

Vendor	Product	Affected versions (per CVE record)
Roundcube	Webmail	< 1.5.10, 1.6.0 < 1.6.11

Severity scores

Scored by	CVSS	Score	Vector
mitre	3.1	9.9 Critical	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H`
GitHub	3.1	9.9	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H`

Attack vector: network (remotely reachable)
Attack complexity: low
Privileges required: low (any account)
User interaction: none
Scope: changed (can affect other components)

CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.

Exploitation and urgency

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.

Timeline

2025-06-02 — CVE record published by mitre
2025-06-02 — GitHub-reviewed advisory GHSA-8j8w-wwqc-x596 published (critical)
2026-02-20 — Added to CISA’s Known Exploited Vulnerabilities catalog
2026-02-21 — CVE record last updated
2026-03-13 — CISA remediation deadline for US federal agencies

Sources and references

Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.

Other references from the CVE record and advisory

github.com github.com
github.com github.com
github.com github.com
github.com github.com
fearsoff.org fearsoff.org
vicarius.io vicarius.io
vicarius.io vicarius.io
openwall.com openwall.com
lists.debian.org lists.debian.org

All exploited Roundcube vulnerabilities · Critical Composer (PHP) advisories · Today’s Security Digest