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VulnerabilityPublished

CVE-2025-41049: appRain CMF · XSS or 'Cross-site Scripting'

Affects appRain CMFSource CVE Database V5

0

Not known to be exploited · CVSS 5.1 Medium.

Data as of 26 Oct 2026, 17:16 UTC

CVSS 4.0 base score
5.1Medium
How severe the flaw is on the 0–10 CVSS scale.
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:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 4 Sep 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
appRain appRain CMFAffected
  • =4.0.5
Fixed in–

AI-suggested

European organizations should immediately audit their use of appRain CMF to identify any instances of version 4.0.5. Until an official patch is released, the following specific mitigations are recommended: 1) Implement strict input validation and output encoding on the 'data[Addon][layouts]' and 'data[Addon][layouts_except]' parameters at the application level, ensuring that any user-supplied data is sanitized to remove or encode potentially malicious scripts. 2) Restrict access to the /apprain/developer/addons/update/appform endpoint to only highly trusted users and monitor access logs for suspicious activity. 3) Employ Content Security Policy (CSP) headers to limit the execution of unauthorized scripts in browsers. 4) Conduct regular security awareness training for authenticated users to recognize phishing and social engineering attempts that could exploit this vulnerability. 5) Monitor for unusual user behavior or signs of session hijacking. 6) Prepare for rapid deployment of patches once available from the vendor. 7) Consider implementing Web Application Firewalls (WAF) with custom rules to detect and block XSS payloads targeting these parameters.

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/appform.

References

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