# CVE-2026-25784: bluespice/wiki container: Insecure default configuration of service token authentication allows privilege escalation to sysop

Status: published. Published: 2026-10-23. Updated: 2026-11-02.

Initialization of a Resource with an Insecure Default vulnerability in Hallo Welt! GmbH BlueSpice (container image bluespice/wiki) allows privilege escalation. The default value of $mwsgTokenAuthenticatorServiceCIDR in the container's LocalSettings.php was intended to restrict internal service authentication to the container network, but evaluated to an empty string when the environment variable WIKI_SERVICE_TOKEN_AUTH_ALLOWED was not set. An empty value disables the IP restriction in the token authenticator component (mwstake/mediawiki-component-token-authenticator). As a result, any user with read access to the wiki (anonymous users on publicly readable wikis) could obtain an application token from the REST API and use it to get a session with sysop privileges as the internal service user.

This issue affects BlueSpice: from 5.2.3 before 5.2.7, and the 5.2.7 container images published before 2026-10-19 15:37 UTC.

## Remediation

- fix: Update to BlueSpice 5.2.7 or later. Container images of 5.2.7 that were pulled before 2026-10-19 15:37 UTC must be pulled again and the containers re-created. (source: CNA: HW)
- workaround: Set the environment variable WIKI_SERVICE_TOKEN_AUTH_ALLOWED of the wiki containers to the CIDR of the internal container network, or deny access to the REST path /rest.php/mws/v1/app-token/generate on the reverse proxy. (source: CNA: HW)

## Affected products and versions

- Hallo Welt! GmbH / BlueSpice (bluespice/wiki): ≥ 5.2.3; < 5.2.7 (affected, semver). Source: CNA: HW

## Severity and prioritization

- CVSS 4.0: 9.3 (critical); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N; source: CNA: HW

- CVSS 3.1: 9.8 (critical); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H; source: CNA: HW

- CISA KEV: No listing in collected sources

- EPSS: 0.34% as of 2026-11-01; percentile 28.14%

- SSVC: exploitation none; automatable yes; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-1188, CWE-269

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://en.wiki.bluespice.com/wiki/Security:Security_Advisories/BSSA-2026-07 (CNA: HW; vendor-advisory)

- https://github.com/hallowelt/docker-bluespice-wiki/commit/04b840be565b508f6e741c376970909b69d2a444 (CNA: HW; patch)

## Provenance

- CNA: HW: https://www.cve.org/CVERecord?id=CVE-2026-25784; retrieved 2026-11-02; source updated 2026-11-02

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-25784; retrieved 2026-11-02; source updated Not reported

Revision: e3697a1675bd171fb89509f7e32fe5e5ac0bed54ecca799ca0a30b27c131ee74

Canonical: https://y2.dev/cve/CVE-2026-25784

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