CVE-2025-41039: 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
- Immediate mitigation should include restricting access to the /apprain/admin/config/opts endpoint strictly to trusted administrators and limiting the number of users with configuration privileges.
- Implement Web Application Firewall (WAF) rules to detect and block suspicious input patterns targeting the vulnerable parameters, especially script tags or event handlers.
- Conduct manual input validation and sanitization on the server side for all configuration parameters before storing or rendering them, applying strict encoding to neutralize HTML and JavaScript content.
- Monitor logs for unusual activity or repeated attempts to inject scripts via the affected parameters.
- Until an official patch is released, consider disabling or restricting the affected configuration options if feasible.
- Educate administrators about the risks of XSS and encourage the use of secure browsers with script-blocking extensions during administrative sessions.
- Plan and prioritize upgrading to a patched version of appRain CMF once available, or apply vendor-provided workarounds.
- Perform regular security assessments and penetration testing focused on administrative interfaces to detect similar vulnerabilities proactively.
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[sconfig][admin_landing_page]', 'data[sconfig][currency]', 'data[sconfig][db_version]', 'data[sconfig][default_pagination]', 'data[sconfig][emailsetup_from_email]', 'data[sconfig][emailsetup_host]', 'data[sconfig][emailsetup_password]', 'data[sconfig][emailsetup_port]', 'data[sconfig][emailsetup_username]', 'data[sconfig][fileresource_id]', 'data[sconfig][large_image_height]', 'data[sconfig][large_image_width]' and 'data[sconfig][time_zone_padding]' parameters in /apprain/admin/config/opts.