CVE-2026-75003: CWE-669 Incorrect Resource Transfer Between Spheres in Roundcube Webmail
CVE-2026-75003 is a medium severity vulnerability in Roundcube Webmail affecting versions 1.6.0 and 1.7.0. It involves an unclosed url() in a FuncIRI attribute of an SVG image that can bypass remote image blocking. This flaw may lead to information disclosure or privilege escalation.
AI Analysis
Technical Summary
In Roundcube Webmail versions 1.6.0 and 1.7.0, an unclosed url() in a FuncIRI attribute within an SVG image can evade the remote image blocking mechanism. This vulnerability, classified as CWE-669 (Incorrect Resource Transfer Between Spheres), may allow an attacker to disclose information or escalate privileges by circumventing intended security controls related to remote image handling.
Potential Impact
The vulnerability allows bypassing of remote image blocking, which can lead to unauthorized information disclosure or privilege escalation within the affected Roundcube Webmail installations. The CVSS 3.1 base score is 5.8 (medium severity), indicating a moderate impact with network attack vector, low attack complexity, no privileges required, no user interaction, and a scope change with limited confidentiality impact.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided at this time. Users should monitor Roundcube's official channels for updates and apply patches once available.
CVE-2026-75003: CWE-669 Incorrect Resource Transfer Between Spheres in Roundcube Webmail
Description
CVE-2026-75003 is a medium severity vulnerability in Roundcube Webmail affecting versions 1.6.0 and 1.7.0. It involves an unclosed url() in a FuncIRI attribute of an SVG image that can bypass remote image blocking. This flaw may lead to information disclosure or privilege escalation.
CVSS v3.1
Score 5.8medium
Affected software
pkg:github/roundcube/roundcubemailRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
In Roundcube Webmail versions 1.6.0 and 1.7.0, an unclosed url() in a FuncIRI attribute within an SVG image can evade the remote image blocking mechanism. This vulnerability, classified as CWE-669 (Incorrect Resource Transfer Between Spheres), may allow an attacker to disclose information or escalate privileges by circumventing intended security controls related to remote image handling.
Potential Impact
The vulnerability allows bypassing of remote image blocking, which can lead to unauthorized information disclosure or privilege escalation within the affected Roundcube Webmail installations. The CVSS 3.1 base score is 5.8 (medium severity), indicating a moderate impact with network attack vector, low attack complexity, no privileges required, no user interaction, and a scope change with limited confidentiality impact.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided at this time. Users should monitor Roundcube's official channels for updates and apply patches once available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-08-17T12:50:50.937Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a8309b6bf8831d539eb804e
Added to database: 08/17/2026, 13:16:38 UTC
Last enriched: 08/17/2026, 13:30:39 UTC
Last updated: 08/17/2026, 13:30:39 UTC
Views: 4
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