CVE-2026-35539

MEDIUM EPSS 16.3%
Published Apr 3, 20262mo ago · Modified Jun 17, 20262w ago
6.1 CVSS 3.1
Medium
Find Similar
Published Apr 3, 2026 2mo ago
Last Modified Jun 17, 2026 2w ago

Description

An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. XSS exists because of insufficient HTML attachment sanitization in preview mode. A victim must preview a text/html attachment.

CVSS Details

Base Score
6.1
Exploitability
2.8
Impact
2.7
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Changed
Confidentiality Low
Integrity Low
Availability None

Threat Intelligence

EPSS Exploit Probability
16.3% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-79 Cross-site Scripting Injection

Affected Products 2

VendorProductVersionRange
roundcubewebmail* <1.5.14
roundcubewebmail*≥1.6.0  –  <1.6.14

References 7

  • github.com https://github.com/roundcube/roundcubemail/commit/10a6d1fa8acac85c727b0a6ae4a6642bfa27bea1
    Patch
  • github.com https://github.com/roundcube/roundcubemail/commit/1b30edf5369668c92fe91dae3d52e477c808aa4f
    Patch
  • github.com https://github.com/roundcube/roundcubemail/commit/d742954ccbcdee7020f8f2e7c49ce0fca5a0efab
    Patch
  • github.com https://github.com/roundcube/roundcubemail/releases/tag/1.5.14
    Release Notes
  • github.com https://github.com/roundcube/roundcubemail/releases/tag/1.6.14
    Release Notes
  • github.com https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5
    Release Notes
  • roundcube.net https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14
    Vendor Advisory

Remediation

  • github.com https://github.com/roundcube/roundcubemail/commit/10a6d1fa8acac85c727b0a6ae4a6642bfa27bea1
    Patch
  • github.com https://github.com/roundcube/roundcubemail/commit/1b30edf5369668c92fe91dae3d52e477c808aa4f
    Patch
  • github.com https://github.com/roundcube/roundcubemail/commit/d742954ccbcdee7020f8f2e7c49ce0fca5a0efab
    Patch