CVE-2026-75006

MEDIUMPre-NVD 5.85.8—
EchelonGraph scoreHIGH confidence

Score 5.8 from GitHub Security Advisory published 2026-08-17. a secondary CVSS source baseline 5.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
5.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, 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. This issue exists because of insufficient fixes for CVE-2026-35540, CVE-2026-48843 and CVE-2026-62643.

CVSS v3
5.8
EG Score
5.8(high)
EG Risk
41(Track)
EG Risk 41/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity58% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
27%
KEV
Not listed

Published

August 17, 2026

Last Modified

August 17, 2026

Advisory Details (5)

Auto-updated Aug 17, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

Security updates 1.6.18 and 1.7.3 released

https://roundcube.net/news/2026/08/09/security-updates-1.6.18-and-1.7.3
github_commit

commit c111b72950cd (roundcube/roundcubemail)

Fix landed in roundcube/roundcubemail commit c111b72950cd — awaiting tagged release

https://github.com/roundcube/roundcubemail/commit/c111b72950cd2bf57d6b86cd129568d90403322d
github_commit

commit 92f85c883594 (roundcube/roundcubemail)

Fix landed in roundcube/roundcubemail commit 92f85c883594 — awaiting tagged release

https://github.com/roundcube/roundcubemail/commit/92f85c883594e5be757154f94548a9ba903455c9
github_commit

commit 8a92380b06b5 (roundcube/roundcubemail)

Fix landed in roundcube/roundcubemail commit 8a92380b06b5 — awaiting tagged release

https://github.com/roundcube/roundcubemail/commit/8a92380b06b5df1481e034c4f40d6a6546c21223
github_commit

commit 7e10ca0110b7 (roundcube/roundcubemail)

Fix landed in roundcube/roundcubemail commit 7e10ca0110b7 — awaiting tagged release

https://github.com/roundcube/roundcubemail/commit/7e10ca0110b7c9aa1b7850b843bb6625e47bbe00

Vendor Advisories for CVE-2026-75006(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 14× in last 7d / 14× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-20 22:56 UTCEPSS rescore
  2. 2026-08-20 14:01 UTCEG score recompute
  3. 2026-08-20 14:01 UTCGHSA enrichment
  4. 2026-08-19 17:04 UTCEPSS rescore
  5. 2026-08-19 14:12 UTCGHSA enrichment
  6. 2026-08-18 14:56 UTCEG score recompute
  7. 2026-08-18 14:56 UTCGHSA enrichment
  8. 2026-08-18 13:49 UTCEPSS rescore
  9. 2026-08-18 13:49 UTCEPSS rescore
  10. 2026-08-17 14:22 UTCEG score recompute
  11. 2026-08-17 14:17 UTCEG score recompute
  12. 2026-08-17 13:30 UTCEG score recompute
  13. 2026-08-17 13:16 UTCEG score recompute
  14. 2026-08-17 13:16 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-75006?
CVE-2026-75006 is a medium vulnerability published on August 17, 2026. In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, 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. This issue exists because of insufficient fixes for…
When was CVE-2026-75006 disclosed?
CVE-2026-75006 was first published in the National Vulnerability Database on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-75006 actively exploited?
CVE-2026-75006 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 72.8% of all scored CVEs.
What is the CVSS score of CVE-2026-75006?
CVE-2026-75006 has a CVSS v3 base score of 5.8 (NVD).
How do I remediate CVE-2026-75006?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-75006, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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