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VulnerabilityPublished

CVE-2025-41056: 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, 10:12 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

  1. Immediate mitigation should involve implementing strict input validation and output encoding on the affected parameters ('data[Addon][layouts]' and 'data[Addon][layouts_except]') to neutralize any malicious scripts.
  2. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers.
  3. Restrict access to the /apprain/developer/addons/update/hysontable endpoint to trusted administrators only, using network segmentation or IP whitelisting.
  4. Monitor web application logs for unusual input patterns or repeated attempts to inject scripts.
  5. Educate users and administrators about the risks of XSS and the importance of cautious interaction with web interfaces.
  6. Engage with the vendor or community to obtain or develop patches or updates addressing this vulnerability.
  7. Consider deploying Web Application Firewalls (WAFs) with rules tailored to detect and block XSS payloads targeting these parameters.
  8. Conduct regular security assessments and penetration tests focusing on input validation weaknesses in appRain CMF deployments.

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/hysontable.

References

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