# CVE-2025-66027: Rallly Information Disclosure Vulnerability in Participant API Leaks Names and Emails Despite Pro Privacy Settings

> Attackers can view participant names and emails via API endpoints, bypassing privacy settings in Rallly scheduling tool.

- **Severity:** High 7.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 29 Nov 2025
- **Updated:** 1 Dec 2025
- **Also known as:** GHSA-65wg-8xgw-f3fg

## What is CVE-2025-66027?

CVE-2025-66027 is a high-severity vulnerability in lukevella rallly, published on 29 Nov 2025. Any signed-in user can exploit it over the network, with no action from the victim.

### Official 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.

Weakness: CWE-359 (Exposure of Private Personal Information to an Unauthorized Actor), CWE-284 (Improper Access Control), CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2025-66027?

It affects 1 product.


Products: Rallly Rallly.

## How do I fix CVE-2025-66027?

No fix has been published for CVE-2025-66027 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-66027 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-66027 exists.

## Other vulnerabilities in lukevella rallly

- [CVE-2025-47781](https://insights.sbomify.com/CVE-2025-47781/): Rallly Insufficient Password Login Token Entropy Leads to Account Takeover (critical 9.8)
- [CVE-2025-65021](https://insights.sbomify.com/CVE-2025-65021/): Rallly Has Unauthorized Poll Finalization via Insecure Direct Object Reference (IDOR) (critical 9.1)
- [CVE-2025-65029](https://insights.sbomify.com/CVE-2025-65029/): Rallly Has an IDOR Vulnerability in Participant Deletion Endpoint Allows Unauthorized Removal of Poll Participants (high 8.1)
- [CVE-2025-65033](https://insights.sbomify.com/CVE-2025-65033/): Rallly Broken Authorization: Any User Can Pause or Resume Any Poll via Poll ID Manipulation (high 8.1)
- [CVE-2025-65034](https://insights.sbomify.com/CVE-2025-65034/): Rallly Improper Authorization Allows Reopening of Any Finalized Poll via Public pollId (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-66027 and fix it if it is affected.

What it is: CVE-2025-66027 is a high-severity vulnerability in lukevella rallly, published on 29 Nov 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-66027 exists.

Affected product: lukevella rallly. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-66027/ (Markdown: https://insights.sbomify.com/CVE-2025-66027/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-66027
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-66027
- OSV: https://osv.dev/vulnerability/CVE-2025-66027

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-66027/
Summaries are generated and may contain mistakes; the official description above is the record.