XSS in Backdropcms Flag
CVE-2025-46595
An XSS issue was discovered in the Flag module before 1.x-3.6.2 for Backdrop CMS. Flag is a module that allows flags to be added to nodes, comments, users, and any other type of entity. It doesn't verify flag links before performing the flag action, or verify that the response returned was provided by the flag module. This can allow crafted HTML to result in Cross Site Scripting. This is mitigated by the fact that an attacker must have a role with permission to create links on the website, for example: create or edit comments or content with a filtered text format.
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.002 (13.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.
Affected products
- Backdropcms Flag — versions 0
Weakness classification (CWE)
Public proof-of-concept exploits
References
Frequently asked questions
- What is CVE-2025-46595?
- CVE-2025-46595 is a medium-severity vulnerability in Backdropcms Flag, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2025-04-25.
- How severe is CVE-2025-46595?
- Medium severity. CVSS v3 base score is 6.4 out of 10.
- Is CVE-2025-46595 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.