CVE-2026-62643Disclosure(roundcube / webmail)

LOWCVSS 10.0 · CRITICAL

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

In Roundcube Webmail before 1.6.17 and 1.7.x before 1.7.2, 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. NOTE: this issue exists because of insufficient fixes for CVE-2026-35540 and CVE-2026-48843.

0.0/ 10 priority

Sources & remediation

Weakness type (CWE)
CWE-918

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • webmail

Threat summary

  • 1 mentions across 1 observed day

What's happening

  • Technical details provided in 1 signal
  • Disclosure: 1 classified signal
  • 1 total mentions across 1 day

Affected systems

Vendors
Products
webmail

Deep dive

Activity timeline1 mentions / 1d
00111Mentions · 2026-08-09: 1Technical Details · 2026-08-09: 108-09
Signal classification1 categories
Disclosure
1100.0%
Referenced assets1 URL
By indicator
Full discourse1 post
  • takenaka hiroya@Joe_Biden_ja
    Disclosure

    Roundcube Webmail の CVE-2026-62643 を掲載しました。HTML メールの CSS の無害化不足で、メールを1通送るだけで SSRF が成立します。NVD の Primary は CVSS 10.0。クラウド上ならインスタンスメタデータへの到達が最… https://cve.autoarticles.net/cve/CVE-2026-62643

    Post summary

    A disclosure of Roundcube Webmail CVE‑2026‑62643 highlighting SSRF via unsanitized CSS and a CVSS score of 10.0, with no PoC or exploit tool detailed.

    0000059
    562 followersView on X
CPE platform detail1 entries

1 of 1 entries

PartVendorProductVersionTarget SWTarget HW
Approundcubewebmail---

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