CVE-2026-74998

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74998
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-17 13:16:54 UTC
Updated2026-08-17 16:17:51 UTC
DescriptionIn Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, responses from the CSS (Cascading Style Sheets) proxy were not validated, which may result in information disclosure or XSS (cross-site scripting) via MIME sniffing.

Risk And Classification

Primary CVSS: v3.1 7.2 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

EPSS: 0.002680000 probability, percentile 0.190380000 (date 2026-08-18)

Problem Types: CWE-79 | CWE-79 CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
3.1CNACVSS7.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Roundcube Webmail affected 1.6.0 1.6.18 semver Not specified
CNA Roundcube Webmail affected 1.7.0 1.7.3 semver Not specified

References

ReferenceSourceLinkTags
roundcube.net/news/2026/08/09/security-updates-1.6.18-and-1.7.3 [email protected] roundcube.net
github.com/roundcube/roundcubemail/commit/62d33c8a0dc3fd0dd03984220dc970... [email protected] github.com
github.com/roundcube/roundcubemail/releases/tag/1.6.18 [email protected] github.com
github.com/roundcube/roundcubemail/commit/a2334990c02f7cb77b1a8d6fa97fcd... [email protected] github.com
github.com/roundcube/roundcubemail/releases/tag/1.7.3 [email protected] github.com
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