[NEW] [high] Roundcube Webmail: Multiple vulnerabilities

highCVE-2026-74997 CVE-2026-74998 CVE-2026-74999 CVE-2026-75000 CVE-2026-75002 CVE-2026-75003

An attacker can exploit multiple vulnerabilities in Roundcube Webmail to execute arbitrary code, gain elevated privileges, bypass security measures, manipulate or disclose data, or conduct cross-site scripting attacks.

CSIRTS triage

vendor: Roundcube product: Roundcube Webmail Remote code execution Privilege escalation Authentication bypass Information disclosure Cross-site scripting

What: Multiple vulnerabilities enable arbitrary code execution, privilege escalation, security bypass, data manipulation, disclosure, and cross-site scripting attacks.
Who is affected: Roundcube Webmail deployments running unpatched versions.
Urgency: High severity; not currently exploited but represents significant risk due to code execution and privilege escalation potential.
Action: Update Roundcube Webmail to the patched version addressing all identified CVEs (CVE-2026-74997 through CVE-2026-75006).

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: high
Published: 2026-08-18
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-2026-2880

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-2026-749970.77% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 52% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-749980.27% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 19% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-749990.21% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 12% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-750000.32% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 25% of all EPSS-scored CVEs.
Moderate exploitation riskCVE-2026-750021.3% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 68% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-750030.31% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 23% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-750040.29% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 21% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-750060.34% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 27% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-750070.25% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 16% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-750100.28% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 20% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-74997	coverage & exploitation status	NVD · CVE.org
CVE-2026-74998	coverage & exploitation status	NVD · CVE.org
CVE-2026-74999	coverage & exploitation status	NVD · CVE.org
CVE-2026-75000	coverage & exploitation status	NVD · CVE.org
CVE-2026-75002	coverage & exploitation status	NVD · CVE.org
CVE-2026-75003	coverage & exploitation status	NVD · CVE.org
CVE-2026-75004	coverage & exploitation status	NVD · CVE.org
CVE-2026-75006	coverage & exploitation status	NVD · CVE.org
CVE-2026-75007	coverage & exploitation status	NVD · CVE.org
CVE-2026-75010	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 Webmail

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.

mediumCVE-2026-75010: In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, the modoboa driver of the password …nvd · 2026-08-17
mediumCVE-2026-75007: In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, the LDAP search filter was subject …nvd · 2026-08-17
mediumCVE-2026-75006: In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, insufficient Cascading Style Sheets…nvd · 2026-08-17
mediumCVE-2026-75004: In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, improper rule name quoting could le…nvd · 2026-08-17
mediumCVE-2026-75003: In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, an unclosed url() in a FuncIRI attr…nvd · 2026-08-17
highCVE-2026-75002: In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, mail search and LITERAL+ byte-count…nvd · 2026-08-17