CVE-2025-66027: Rallly is an open-source scheduling and collaboration tool

Q: How do I fix CVE-2025-66027?

rallly: upgrade to 4.5.6. Exact commands for each OS are on this page.

Q: Is CVE-2025-66027 being exploited?

CVE-2025-66027 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-66027 affect?

CVE-2025-66027 affects rallly. Severity is medium (CVSS 6.5). 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.

Q: How urgent is CVE-2025-66027?

Priority 35/100. Public exploit reference

Routine

MEDIUM 6.5UPGRADE

CVE-2025-66027 is a medium-severity flaw (CVSS 6.5) affecting rallly. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 71%)
CISA exploited list	No
Weakness	CWE-200, CWE-284, CWE-359
Published	2025-11-29
Last modified	2026-10-07

Publisher (CNA): GitHub, Inc. · Vendor: rallly

Last updated 2026-10-07 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-11-29 01:16 UTCPublished CVE record published
2026-10-07 20:10 UTCUpdated Record last modified

rallly rallly UPGRADE

Affected: < 4.5.6

Fixed in: 4.5.6

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy rallly || rpm -q rallly || rallly --version

2. UPGRADE to 4.5.6 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade rallly

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade rallly

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-66027?

rallly: upgrade to 4.5.6. Exact commands for each OS are on this page.

Is CVE-2025-66027 being exploited?

CVE-2025-66027 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-66027 affect?

CVE-2025-66027 affects rallly. Severity is medium (CVSS 6.5). 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.

How urgent is CVE-2025-66027?

Priority 35/100. Public exploit reference

Related CVEs

CVE-2025-65021 CRITICAL 9.1 UPGRADE Rallly is an open-source scheduling and collaboration tool
CVE-2025-65029 HIGH 8.1 UPGRADE Rallly is an open-source scheduling and collaboration tool
CVE-2025-65033 HIGH 8.1 UPGRADE Rallly is an open-source scheduling and collaboration tool
CVE-2025-65034 HIGH 8.1 UPGRADE Rallly is an open-source scheduling and collaboration tool
CVE-2025-65020 MEDIUM 6.5 UPGRADE Rallly is an open-source scheduling and collaboration tool

References

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