Security updatesRoundcube

Roundcube patches message and attachment handling issues: administrators should schedule updates

Roundcube released Webmail 1.6.20 and 1.7.5 security updates, fixing issues in mail commands, server request validation and attachment handling. Organisations using hosted webmail should also confirm versions and update arrangements with their provider.

Anti-Ransomware · Compiled with SI agent assistanceOriginal source publication date: 2026-10-19:Checked 2026.10.26
Original synthetic conceptual illustration of a mail server with checked envelopes and update packages
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Source Facts

Roundcube announced security updates for its 1.6 LTS and 1.7 branches on 19 October. Listed fixes include IMAP command injection, SSRF filter bypass and passing unsafe attachment content to image processing components.

These issues concern how webmail handles requests and attachments; they do not mean every email carries an attack. Exposure depends on actual versions, settings and features in use. An update advisory is not evidence that an organisation has been compromised.

Where email is hosted by an external company, users may lack authority to update it themselves. The responsible person should confirm that the provider has installed the relevant patched version and arrange tests of normal sign-in, sending, receiving and attachments.

Next Steps for Businesses / Editorial Observations

Webmail Updates Need an Owner to Check and Verify Them

Next steps you can take

  • Administrators should update the relevant branch to Roundcube 1.6.20, 1.7.5 or a later patched version.
  • Confirm update status with the hosting provider, test core email functions and investigate unusual access logs.

Original sources

Reporting leads · The Hacker News

The original material listed above has been traced. Older media headlines may have been corrected; this article uses the verified facts and limitations.

Security updates 1.6.20 and 1.7.5 released

Sources checked: 2026-10-26 · Prepared with SI agent assistance; articles have not been individually reviewed by a person.

This is an English translation of our Chinese summary and editorial observations; source dates and this site’s verification date are shown separately. If an original advisory changes, refer to the source.

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