How severe is CVE-2025-66027?

CVE-2025-66027 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2025-66027 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-66027?

CVE-2025-66027 affects Rallly. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-66027?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-66027 have an EU (EUVD) identifier?

Yes. CVE-2025-66027 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-199883.

When was CVE-2025-66027 published?

CVE-2025-66027 was published on 2025-11-29 and last updated on 2026-06-17.

CVE-2025-66027

CVE-2025-66027 is a medium-severity vulnerability in Rallly with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-200.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v4: 7.1
EPSS exploit prediction: 0% (23rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-199883
Weakness: CWE-200
Affected product: Rallly
Published: 2025-11-29
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2025-66027?: 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.
How severe is CVE-2025-66027?: CVE-2025-66027 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2025-66027 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-66027?: CVE-2025-66027 affects Rallly. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-66027?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-66027 have an EU (EUVD) identifier?: Yes. CVE-2025-66027 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-199883.
When was CVE-2025-66027 published?: CVE-2025-66027 was published on 2025-11-29 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:rallly:rallly:*:*:*:*:*:*:*:*

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