CVE-2026-35538 | Roundcube Webmail up to 1.5.13/1.6.13 IMAP SEARCH Command Argument argument injection

VDB-355068 · CVE-2026-35538 · GCVE-0-2026-35538 ROUNDCUBE WEBMAIL UP TO 1.5.13/1.6.13 IMAP SEARCH COMMAND ARGUMENT ARGUMENT INJECTION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 4.0 $0-$5k 1.51+ Summaryinfo A vulnerability classified as critical was found in Roundcube Webmail up to 1.5.13/1.6.13. Affected is an unknown function of the component IMAP SEARCH Command Argument Handler. The manipulation results in argument injection. This vulnerability was named CVE-2026-35538. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is advised. Detailsinfo A vulnerability classified as critical has been found in Roundcube Webmail up to 1.5.13/1.6.13. Affected is an unknown function of the component IMAP SEARCH Command Argument Handler. The manipulation with an unknown input leads to a argument injection vulnerability. CWE is classifying the issue as CWE-88. The product constructs a string for a command to be executed by a separate component in another control sphere, but it does not properly delimit the intended arguments, options, or switches within that command string. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes: An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. Unsanitized IMAP SEARCH command arguments could lead to IMAP injection or CSRF bypass during mail search. The advisory is shared for download at roundcube.net. This vulnerability is traded as CVE-2026-35538 since 04/03/2026. The exploitability is told to be difficult. It is possible to launch the attack remotely. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1059. Upgrading to version 1.5.14 or 1.6.14 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 5fe8a69956a9683a4269f3ad2a68e18deebf8a15 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version. Productinfo Type Mail Client Software Vendor Roundcube Name Webmail Version 1.5.0 1.5.1 1.5.2 1.5.3 1.5.4 1.5.5 1.5.6 1.5.7 1.5.8 1.5.9 1.5.10 1.5.11 1.5.12 1.5.13 1.6.0 1.6.1 1.6.2 1.6.3 1.6.4 1.6.5 1.6.6 1.6.7 1.6.8 1.6.9 1.6.10 1.6.11 1.6.12 1.6.13 License free CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 4.1 VulDB Meta Temp Score: 4.0 VulDB Base Score: 5.0 VulDB Temp Score: 4.8 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 3.1 CNA Vector (MITRE): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Argument injection CWE: CWE-88 / CWE-74 / CWE-707 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: Webmail 1.5.14/1.6.14 Patch: 5fe8a69956a9683a4269f3ad2a68e18deebf8a15 Timelineinfo 04/03/2026 Advisory disclosed 04/03/2026 +0 days CVE reserved 04/03/2026 +0 days VulDB entry created 04/03/2026 +0 days VulDB entry last update Sourcesinfo Advisory: roundcube.net Status: Confirmed CVE: CVE-2026-35538 (🔒) GCVE (CVE): GCVE-0-2026-35538 GCVE (VulDB): GCVE-100-355068 Entryinfo Created: 04/03/2026 07:49 Changes: 04/03/2026 07:49 (68) Complete: 🔍 Cache ID: 99:D25:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸