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CVE-2025-57880VulnerabilityPublished

CVE-2025-57880: Hallo Welt! BlueSpice · Improper Encoding or Escaping of Output

Affects Hallo Welt! BlueSpiceSource CVE Database V5

0

Not known to be exploited · CVSS 5.9 Medium.

Data as of 26 Oct 2026, 07:57 UTC

CVSS 4.0 base score
5.9Medium
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:P/PR:L/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 19 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 2026-10-26.

What to do

Affected software

ProductAffectedFixed in
Hallo Welt! GmbH BlueSpiceAffected
  • =5
Fixed in–

AI-suggested

To mitigate this vulnerability effectively, European organizations should: 1) Immediately assess their BlueSpice installations to identify if affected versions (5 through 5.1.1) of the BlueSpiceWhoIsOnline extension are in use. 2) Apply any available patches or updates from Hallo Welt! GmbH as soon as they are released; if no patches are currently available, consider disabling or removing the vulnerable extension temporarily to eliminate the attack vector. 3) Implement strict Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of potential XSS attacks. 4) Conduct thorough input validation and output encoding on all user-supplied data within the BlueSpice environment, especially in custom extensions or templates, to prevent injection of malicious code. 5) Educate users about the risks of clicking on suspicious links or interacting with unexpected content within the wiki platform. 6) Monitor logs and user activity for signs of exploitation attempts, such as unusual session behavior or unexpected script execution. 7) Consider deploying Web Application Firewalls (WAF) with rules tailored to detect and block XSS payloads targeting BlueSpice. These steps go beyond generic advice by focusing on immediate risk reduction through configuration changes, user awareness, and proactive monitoring.

Description

Improper Encoding or Escaping of Output vulnerability in Hallo Welt! GmbH BlueSpice (Extension:BlueSpiceWhoIsOnline) allows Cross-Site Scripting (XSS). This issue affects BlueSpice: from 5 through 5.1.1.

References

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