Trending
CVE-2026-35539

CVE detail

CVE-2026-35539

An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. XSS exists because of insufficient HTML attachment sanitization in preview mode. A victim must preview a text/html attachment.

CVSS 6.1 · MediumBuzz score 30.8

Buzz score

Why this CVE is surfacing

Buzz score total 30.8

This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.

Buzz score components · mention 20.8 · diversity 10.0 · KEV 0.0 · OTX 0.0 · PoC 0.0

Mention score

20.8

7 evidence mentions in the snapshot

Diversity score

10.0

2 sources across 2 categories

KEV score

0.0

No KEV entry observed

OTX score

0.0

0 OTX pulses

PoC score

0.0

0 repos · best confidence N/A

Best PoC traction

Maximum stars on a matched PoC repo

Why it matters now

Mention timeline

Total mentions: 0; within the 30d window
Peak daily: 0; highest bucket

Evidence

Source links by recency

Newest mentions first

7 source links · newest first

https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14roundcube.net
No excerpt available.
Vendor Advisoryroundcube.netApr 3, 2026, 5:16 AM
https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5github.com
No excerpt available.
Exploitgithub.comApr 3, 2026, 5:16 AM
https://github.com/roundcube/roundcubemail/releases/tag/1.6.14github.com
No excerpt available.
Exploitgithub.comApr 3, 2026, 5:16 AM
https://github.com/roundcube/roundcubemail/releases/tag/1.5.14github.com
No excerpt available.
Exploitgithub.comApr 3, 2026, 5:16 AM
https://github.com/roundcube/roundcubemail/commit/d742954ccbcdee7020f8f2e7c49ce0fca5a0efabgithub.com
No excerpt available.
Exploitgithub.comApr 3, 2026, 5:16 AM
https://github.com/roundcube/roundcubemail/commit/1b30edf5369668c92fe91dae3d52e477c808aa4fgithub.com
No excerpt available.
Exploitgithub.comApr 3, 2026, 5:16 AM
https://github.com/roundcube/roundcubemail/commit/10a6d1fa8acac85c727b0a6ae4a6642bfa27bea1github.com
No excerpt available.
Exploitgithub.comApr 3, 2026, 5:16 AM

Exploit code

Public exploit repository references

Public PoC repositories are third-party, potentially unsafe artifacts. Treat their code as untrusted and use it only on authorized systems in an isolated, least-privilege environment. cvebuzz does not execute the code or verify that an exploit works.

0 repository references · best confidence N/A · max 0 stars

No public PoC repositories have been matched yet.

Related records

Similar CVEs

6 related CVEs with shared weakness or product evidence

CVE-2026-54433
In Roundcube Webmail before 1.6.17 and 1.7.x before 1.7.2, there is Stored Cross-Site Scripting (XSS) via a crafted plain-text email message. The attacker-controlled JavaScript ex…
CVSS 7.2 · High
1 mention
CVE-2025-68461
Roundcube Webmail before 1.5.12 and 1.6 before 1.6.12 is prone to a Cross-Site-Scripting (XSS) vulnerability via the animate tag in an SVG document.
CVSS 7.2 · High
KEV listed4 mentions
CVE-2024-42009
A Cross-Site Scripting vulnerability in Roundcube through 1.5.7 and 1.6.x through 1.6.7 allows a remote attacker to steal and send emails of a victim via a crafted e-mail message…
CVSS 9.3 · Critical
KEV listed11 mentions
CVE-2024-42008
A Cross-Site Scripting vulnerability in rcmail_action_mail_get->run() in Roundcube through 1.5.7 and 1.6.x through 1.6.7 allows a remote attacker to steal and send emails of a vic…
CVSS 9.3 · Critical
3 mentions
CVE-2024-37384
Roundcube Webmail before 1.5.7 and 1.6.x before 1.6.7 allows XSS via list columns from user preferences.
CVSS 6.1 · Medium
CVE-2024-37383
Roundcube Webmail before 1.5.7 and 1.6.x before 1.6.7 allows XSS via SVG animate attributes.
CVSS 6.1 · Medium
KEV listed8 mentions

External lookup

Potential internet exposure

Potential exposure only — not proof of vulnerability.Shodan results indicate potentially internet-exposed products, not confirmed vulnerable systems. They do not confirm that any returned system is vulnerable to CVE-2026-35539.

Product-level CPE searches intentionally omit version fields and NVD version-range or configuration certainty. Verify the exact product version and configuration independently.

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Product CPE queries

Derived from this CVE's existing NVD CPE 2.3 records; the application, operating-system, or hardware part is retained.

cpe:2.3:a:roundcube:webmailSearch this product on Shodan

Exact CVE query

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Shodan's exact vuln: filter is separate from the product searches above and requires an eligible paid Shodan plan.

vuln:CVE-2026-35539Search this CVE on Shodan

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Metadata

Canonical fields

NVD status

Analyzed

Published

Apr 3, 2026

Modified

Jul 24, 2026

Official record

Authoritative NVD record

CVSS vector

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

CWE IDs

Vendor classifications

How this vector reads

CVSS 3.1 base metrics decoded below. This explanation does not recalculate or change the NVD score.

Attack Vector (AV): Network. The vulnerable system can be reached across network boundaries.
Attack Complexity (AC): Low. No special conditions beyond the attacker-controlled steps are required.
Privileges Required (PR): None. The attacker needs no privileges on the vulnerable system.
User Interaction (UI): Required. Another user must take an action for exploitation to succeed.
Scope (S): Changed. Impacts can cross into a different security authority.
Confidentiality Impact (C): Low. There is a limited impact to this security property.
Integrity Impact (I): Low. There is a limited impact to this security property.
Availability Impact (A): None. There is no direct impact to this security property.

Signals

Exploitation indicators

0 stored signals · no KEV · 0 OTX pulses