Is CVE-2025-66027 in the CISA KEV catalog?

No. CVE-2025-66027 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-66027?

CVE-2025-66027 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2025-66027?

CVE-2025-66027 has an EPSS score of 0.31% (22th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-66027?

Upgrade rallly to 4.5.6 or later.

CVE & CISA-KEV Catalog

CVE-2025-66027

MEDIUM

6.5

CVSS v3

NVD

Description

Rallly is an open-source scheduling and collaboration tool. Prior to version 4.5.6, an information disclosure vulnerability exposes participant details, including names and email addresses through the /api/trpc/polls.get,polls.participants.list endpoint, even when Pro privacy features are enabled. This bypasses intended privacy controls that should prevent participants from viewing other users’ personal information. This issue has been patched in version 4.5.6.

CWE-200Information Exposure CWE-284Improper Access Control CWE-359

How to fix

Remediation Available

ralllyNVD

Affected:< 4.5.6Fixed in:4.5.6CVE-2025-66027derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

0.31%probability of exploitation in 30 days

22ndpercentile

Low risk: more likely to be exploited than 22% of all known CVEs.

References

Patch1

github.com

Exploit1

github.com

Release Notes1

github.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-12-03.