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CVE-2025-41050VulnerabilityPublished

CVE-2025-41050: 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 25 Oct 2026, 19:02 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 2026-10-25.

What to do

Affected software

ProductAffectedFixed in
appRain appRain CMFAffected
  • =4.0.5
Fixed in–

AI-suggested

1. Immediate mitigation should include restricting access to the affected endpoint (/apprain/developer/addons/update/base_libs) to trusted administrators only, using network segmentation and access control lists. 2. Implement strict input validation and output encoding on the parameters 'data[Addon][layouts]' and 'data[Addon][layouts_except]' to neutralize potentially malicious scripts. 3. Monitor logs for unusual activity related to these parameters, especially from authenticated users with low privileges. 4. Employ Content Security Policy (CSP) headers to reduce the impact of XSS by restricting the execution of unauthorized scripts. 5. Conduct a thorough review of user roles and permissions to minimize the number of users with access to vulnerable functionality. 6. Stay alert for official patches or updates from appRain and apply them promptly once available. 7. Educate users and administrators about the risks of XSS and safe usage practices. 8. Consider deploying Web Application Firewalls (WAFs) with rules tailored to detect and block exploitation attempts 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/base_libs.

References

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