[NEW] [medium] Roundcube: Multiple vulnerabilities

mediumpublic exploitCVE-2026-54432 CVE-2026-54433

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

vendor: Roundcube product: Roundcube Authentication bypass Denial of service Cross-site scriptingOther

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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Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: medium
Published: 2026-08-31
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2207

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-544320.21% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 11% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-544330.31% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 24% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-54432	coverage & exploitation status	NVD · CVE.org
CVE-2026-54433	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Roundcube

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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