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CVE-2026-35540

An issue was discovered in Roundcube Webmail 1.6.0 before 1.6.14. Insufficient Cascading Style Sheets (CSS) sanitization in HTML e-mail messages may lead to SSRF or Information Disclosure, e.g., if stylesheet links point to local network hosts.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:6404de180077a1a039fcbc38419621a9544e5c44a353c41a8e57fa34e81a6726
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","product":"Webmail","vendor":"Roundcube","versions":[{"lessThan":"1.6.14","status":"affected","version":"1.6.0","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:72bcba413c805cd49edd8482155e470742323f68b073f17c49ac17894dd72a5a · sha256:914557c8fbc55b34… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.4,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:72bcba413c805cd49edd8482155e470742323f68b073f17c49ac17894dd72a5a · sha256:914557c8fbc55b34… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-669","description":"CWE-669 Incorrect Resource Transfer Between Spheres","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:72bcba413c805cd49edd8482155e470742323f68b073f17c49ac17894dd72a5a · sha256:914557c8fbc55b34… · /containers/cna/problemTypes/0/descriptions/0

Source references

5 source assertions
{"url":"https://github.com/roundcube/roundcubemail/commit/27ec6cc9cb25e1ef8b4d4ef39ce76d619caa6870"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:72bcba413c805cd49edd8482155e470742323f68b073f17c49ac17894dd72a5a · sha256:914557c8fbc55b34… · /containers/cna/references/4
{"url":"https://github.com/roundcube/roundcubemail/commit/579b68eff90650a5c782e153debd66c765648942"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:72bcba413c805cd49edd8482155e470742323f68b073f17c49ac17894dd72a5a · sha256:914557c8fbc55b34… · /containers/cna/references/2
{"url":"https://github.com/roundcube/roundcubemail/releases/tag/1.6.14"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:72bcba413c805cd49edd8482155e470742323f68b073f17c49ac17894dd72a5a · sha256:914557c8fbc55b34… · /containers/cna/references/3
{"url":"https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:72bcba413c805cd49edd8482155e470742323f68b073f17c49ac17894dd72a5a · sha256:914557c8fbc55b34… · /containers/cna/references/1
{"url":"https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:72bcba413c805cd49edd8482155e470742323f68b073f17c49ac17894dd72a5a · sha256:914557c8fbc55b34… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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