EUVD-2026-43732
GHSA-6hj3-f24f-rwj8
Severity by source
AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Network-delivered XSS with no attacker privileges; I assess UI:R because a webmail victim typically must view the crafted message, keeping S:C and Low C/I as the injected script runs in the authenticated origin.
Primary rating from NVD.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Lifecycle Timeline
5DescriptionNVD
[Unknown description]
AnalysisAI
Cross-site scripting in Roundcube Webmail allows remote attackers to inject arbitrary script into a victim's authenticated mail session, with the CVSS scope-change flag indicating the payload can affect resources beyond the vulnerable component (e.g. the surrounding webmail DOM/session). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must be able to deliver attacker-controlled content that Roundcube renders in a victim's browser - in a webmail context this almost always means sending an email (or crafting a request) whose HTML/content reaches the victim's Roundcube session. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The supplied CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N, 7.2 High) describes network-reachable, low-complexity exploitation requiring no privileges and, notably, no user interaction - an aggressive profile for XSS, where a victim typically must open a crafted message. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker sends a specially crafted email (or supplies crafted input to a vulnerable Roundcube parameter) containing an XSS payload that survives sanitization; when the target's authenticated Roundcube session renders it, the script executes in the webmail origin. The attacker can then read or exfiltrate email content, hijack the session, or perform actions as the victim. … |
| Remediation | Upgrade to a fixed release: Roundcube 1.6.17 for the 1.6.x branch or 1.7.2 for the 1.7.x branch, as published at https://roundcube.net/news/2026/07/05/security-updates-1.6.17-and-1.7.2; distribution users (e.g. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: complete inventory of all Roundcube instances in production, documenting current version numbers and deployment scope across the organization. …
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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