Quick answers
- Is CVE-2026-54432 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-54432 being exploited in the wild.
- How severe is CVE-2026-54432?
- Medium severity, with a CVSS score of 4.7, published 14 July 2026.
- Which products and versions are affected?
- Roundcube Webmail before 1.6.17, 1.7.x before 1.7.2.
- Is there a fix for CVE-2026-54432?
- A patch was published on 2026-07-05: Security updates 1.6.17 and 1.7.2 released by vendor. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-54432 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-54432?
- Check whether you run Roundcube Webmail at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A stored cross-site scripting (XSS) vulnerability exists in Roundcube Webmail due to improper neutralization of input during web page generation (CWE-79). Specifically, the application fails to properly escape the MIME type of an email attachment when displaying the attachment-validation warning page. An attacker can exploit this by sending a specially crafted email with a malicious MIME type string. When a recipient views the warning page associated with that attachment, the malicious script executes in the context of their session. This can lead to session hijacking or unauthorized actions. The issue is resolved in versions 1.6.17 and 1.7.2.
Affected products
- Roundcube Webmail before 1.6.17, 1.7.x before 1.7.2
Timeline
- 2026-07-05: patched: Security updates 1.6.17 and 1.7.2 released by vendor.
- 2026-07-14: disclosed: CVE published to the NVD.