CVE-2025-41057: appRain CMF · XSS or 'Cross-site Scripting'
Affects appRain CMFSource CVE Database V5
Not known to be exploited · CVSS 5.1 Medium.
Data as of 26 Oct 2026, 14:05 UTC
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 7% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:NExploitation evidence
Disclosed: evidence found.
CVE published 4 Sep 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| appRain appRain CMF | Affected
| Fixed in– |
AI-suggested
European organizations should implement the following specific mitigations: 1) Immediately audit and restrict user privileges to minimize the number of users who can access the vulnerable endpoint. 2) Apply strict input validation and output encoding on the 'data[Addon][layouts]' and 'data[Addon][layouts_except]' parameters, ideally by updating to a patched version of appRain CMF once available. 3) Implement Web Application Firewall (WAF) rules to detect and block suspicious payloads targeting these parameters. 4) Conduct regular security reviews and penetration testing focusing on authenticated user input vectors. 5) Educate users about phishing and credential security to reduce the risk of account compromise. 6) Monitor logs for unusual activity around the /apprain/developer/addons/update/rich_text_editor endpoint. 7) If patching is not immediately possible, consider temporarily disabling or restricting access to the affected functionality. These steps go beyond generic advice by focusing on the specific vulnerable parameters and the authenticated nature of the exploit.
Description
A vulnerability has been discovered in appRain CMF version 4.0.5, consisting of a stored authenticated XSS due to a lack of proper validation of user input, through the 'data[Addon][layouts]' and 'data[Addon][layouts_except]' parameters in /apprain/developer/addons/update/rich_text_editor.