CVE-2026-54433
Public exploit code is available. Proof-of-concept or working exploit code for CVE-2026-54433 is indexed in GitHub PoC. Expect opportunistic scanning and exploitation attempts — prioritize remediation even though it is not (yet) in the CISA KEV catalog.
An attacker can exploit multiple vulnerabilities in Roundcube to bypass security measures, cause denial-of-service attacks, perform cross-site scripting attacks, and manipulate or disclose data.
CSIRTS triage
- What
- Multiple vulnerabilities in Roundcube can be exploited to bypass security measures, cause denial-of-service attacks, perform cross-site scripting attacks, and manipulate or disclose data.
- Who is affected
- Deployments of Roundcube are affected by these vulnerabilities.
- Urgency
- Remediation is medium priority as the vulnerabilities are not currently exploited but could lead to significant issues if left unaddressed.
- Action
- Update to the latest version of Roundcube to mitigate these vulnerabilities.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.31% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 24% of all EPSS-scored CVEs.
Exploit availability
Public exploit or proof-of-concept code for CVE-2026-54433 is indexed in these free datasets. Available exploit code raises real-world risk independent of the CVSS score.
- GitHub PoCPublic proof-of-concept repositories on GitHub reference this CVE.look it up ↗
Advisory coverage (4)
- medium[NEW] [medium] Roundcube: Multiple vulnerabilitiescert-bund · 2026-08-06
- unknownDSA-6391-1 roundcube - security updatedebian · 2026-07-19
- highCVE-2026-54433: In Roundcube Webmail before 1.6.17 and 1.7.x before 1.7.2, there is Stored Cross-Site Scriptin…nvd · 2026-07-14
- unknownMultiple vulnerabilities in Roundcube (July 6, 2026)cert-fr-avis · 2026-07-06
External references
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[](https://www.csirts.com/cve/CVE-2026-54433)