CVE-2025-46703: Improper Encoding or Escaping of Output vulnerability in Hallo Welt! GmbH BlueSpice (Extension:AtMentions) all

Routine

MEDIUM 6.4UPGRADE

CVE-2025-46703 is a medium-severity flaw (CVSS 6.4) affecting bluespice. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 91%)
CISA exploited list	No
Weakness	CWE-116, CWE-79
Published	2025-09-19
Last modified	2026-06-17

Publisher (CNA): Hallo Welt! GmbH · Vendor: hallowelt

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-09-19 14:15 UTCPublished CVE record published
2026-06-17 09:26 UTCUpdated Record last modified

hallowelt bluespice UPGRADE

Affected: >= 5.0 and < 5.1.2

Fixed in: 5.1.2

Safe to downgrade to: a release before 5.0

1. Check installed version

apt-cache policy bluespice || rpm -q bluespice || bluespice --version

2. UPGRADE to 5.1.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade bluespice

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade bluespice

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 5.0 (Debian / Ubuntu)

apt-cache madison bluespice sudo apt install bluespice=<VERSION_BEFORE_5.0> sudo apt-mark hold bluespice

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list bluespice sudo dnf downgrade bluespice-<VERSION_BEFORE_5.0> sudo dnf versionlock add bluespice

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-46703?

bluespice: upgrade to 5.1.2. Exact commands for each OS are on this page.

Is CVE-2025-46703 being exploited?

CVE-2025-46703 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-46703 affect?

CVE-2025-46703 affects bluespice. Severity is medium (CVSS 6.4). 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.

How urgent is CVE-2025-46703?

Priority 25/100. No elevated risk signals yet.

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References

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