Vulnerability · Published Nov 19, 2025 · Assigned by GitHub_M

CVE-2025-65031Rallly Improper Authorization in Comment Endpoint Allows User Impersonation

Medium 6.5

In plain English

A medium-severity authorization bypass via user-controlled key in rallly from lukevella. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 19% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.3%top 80.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Rallly is an open-source scheduling and collaboration tool. Prior to version 4.5.4, an improper authorization flaw in the comment creation endpoint allows authenticated users to impersonate any other user by altering the authorName field in the API request. This enables attackers to post comments under arbitrary usernames, including privileged ones such as administrators, potentially misleading other users and enabling phishing or social engineering attacks. This issue has been patched in version 4.5.4.

Affected products (as reported)

Vendor	Product	Versions
lukevella	rallly	< 4.5.4

Weakness: CWE-285, CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

References

https://github.com/lukevella/rallly/security/advisories/GHSA-hhfc-6gq7-rrpm x_refsource_CONFIRM
https://github.com/lukevella/rallly/releases/tag/v4.5.4 x_refsource_MISC