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PatchSiren cyber security CVE debrief

CVE-2026-35538 Roundcube CVE debrief

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. This vulnerability has a CVSS score of 3.1, indicating low severity. Organizations using affected versions should apply patches to prevent potential attacks. The CVE record was published on 2026-04-03T05:16:21.647Z and has not been modified since then.

Vendor
Roundcube
Product
Webmail
CVSS
LOW 3.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-03
Original CVE updated
2026-07-24
Advisory published
2026-04-03
Advisory updated
2026-07-24

Who should care

Organizations using Roundcube Webmail versions prior to 1.5.14 or 1.6.14 should apply the necessary patches to prevent potential IMAP injection or CSRF bypass attacks. Security teams and vulnerability management teams should review the CVE record and NVD entry to understand the impact and available patches.

Technical summary

The vulnerability, CVE-2026-35538, exists in Roundcube Webmail before versions 1.5.14 and 1.6.14. It is caused by unsanitized IMAP SEARCH command arguments, which could lead to IMAP injection or CSRF bypass during mail search. The CVSS score for this vulnerability is 3.1, indicating a low severity. Organizations should apply patches to update Roundcube Webmail to version 1.5.14 or 1.6.14 and monitor IMAP SEARCH command usage.

Defensive priority

Apply patches to update Roundcube Webmail to version 1.5.14 or 1.6.14. Monitor and restrict IMAP SEARCH command usage. Conduct regular security audits and vulnerability assessments.

Recommended defensive actions

  • Apply patches to update Roundcube Webmail to version 1.5.14 or 1.6.14
  • Monitor and restrict IMAP SEARCH command usage
  • Conduct regular security audits and vulnerability assessments
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide information on the vulnerability, its impact, and available patches. Roundcube has released versions 1.5.14 and 1.6.14 to address this issue. Organizations should verify their deployments and apply patches or mitigations as necessary. Evidence is limited to public sources and may not reflect the full scope or impact of the vulnerability. Defenders should review official advisories and monitor for potential IMAP injection or CSRF bypass attacks.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-35538 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-35538

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-35538 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-35538

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.