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CVE-2025-46703VulnerabilityPublished

CVE-2025-46703: 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, 06:26 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 9% 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

Organizations should prioritize updating BlueSpice to versions beyond 5.1.1 once patches become available from Hallo Welt! GmbH. In the interim, administrators can implement strict Content Security Policies (CSP) to restrict script execution and reduce XSS impact. Input sanitization and output encoding should be reviewed and enhanced, particularly for user-generated content in the AtMentions extension. Employing web application firewalls (WAFs) with rules targeting XSS patterns can provide additional protection. User education to recognize suspicious links or content and limiting privileges to the minimum necessary can reduce exploitation likelihood. Regular security audits and penetration testing focused on web application vulnerabilities will help identify residual risks. Monitoring logs for unusual activity related to BlueSpice usage can aid in early detection of exploitation attempts.

Description

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

References

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