Retrospective for 2026-07-12, compiled on 27 October 2026. The date identifies the day being analysed; source publication and revision dates are recorded below.
What this advisory changes in your environment
The starting point is CERTFR-2026-AVI-0860, published on 2026-07-10. Its scope includes CPCI85 Central Processing/Communication, SICORE Base system. Reported consequences are denial of service, code execution, security control bypass, privilege escalation. These statements apply to the advisory’s scope; they do not assign every consequence to every product or CVE.
This case contains 2 version entries; CVE identifier count: 4. Track remediation by component: a successful overall update does not demonstrate that CPCI85 Central Processing/Communication and SICORE Base system each received their respective fix.
Products and versions to examine
- Reference
- CERTFR-2026-AVI-0860
- Source first published
- 2026-07-10
- Latest source revision available for this day
- 2026-07-10
- Named components
- CPCI85 Central Processing/Communication, SICORE Base system
- CVE identifiers
- CVE-2026-54798, CVE-2026-54801, CVE-2026-54799, CVE-2026-54800
| Component | Published condition |
|---|---|
| CPCI85 Central Processing/Communication | < 26.20 |
| SICORE Base system | < 26.20.0 |
For CPCI85 Central Processing/Communication, the published condition is “< 26.20”. Compare the version actually loaded with that condition within its own release branch. A fix installed on another edition of CPCI85 Central Processing/Communication does not close this case.
Mechanism and prerequisites
Execution context matters as much as the flaw’s name. Distinguish operations available to a local user from those exposed remotely, then examine the permissions and secrets of the affected process.
The primary record CVE-2026-54798, published by siemens, covers CPCI85 Central Processing/Communication, SICORE Base system. The retained revision is dated 2026-07-09. Its scope is presented separately from the integrations and product groupings in CERTFR-2026-AVI-0860.
The published metric for CVE-2026-54798 is CVSS 4.0, 7.1/10. The vector below describes technical prerequisites; it does not measure attack frequency or the likelihood that your deployment is compromised.
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- Attack vector
- Not specified in the retained source
- Prior privileges
- Not specified in the retained source
- User interaction
- Not specified in the retained source
- Complexity
- Not specified in the retained source
- Weakness
- CWE-489
Choose the appropriate intervention
- Locate CPCI85 Central Processing/Communication instances, running releases and service owners. Record condition < 26.20 in the ticket alongside reference CERTFR-2026-AVI-0860.
- Compare the installed branch with the vendor’s CPCI85 Central Processing/Communication release notes. Prepare the package for that branch and a dependent-service test, retaining the pre-change state.
- After changing CPCI85 Central Processing/Communication, capture the loaded version again and verify the workflow below. Any exception needs an owner, an exposure-reduction measure and an expiry date.
Verify the fix in a real workflow
Validation scenario to adapt for CPCI85 Central Processing/Communication: For CPCI85 Central Processing/Communication, prepare validation with the operations owner on a test bench or representative copy. Verify process communications and maintenance access; technical ability to update does not authorise interruption of an industrial system. This is a proposed defensive check, not a claim that testing was performed against third-party systems.
Limit of case CERTFR-2026-AVI-0860: this analysis replaces neither vendor prerequisites nor investigation of your logs. Only documented versions are reproduced; no attack date or victim is invented.
Questions specific to this case
Which condition should be checked for CPCI85 Central Processing/Communication?
Advisory CERTFR-2026-AVI-0860 states: CPCI85 Central Processing/Communication — < 26.20. Check the edition and running release; do not extend the published boundary to branches absent from the advisory.
Why not use one fix for CPCI85 Central Processing/Communication and SICORE Base system?
CERTFR-2026-AVI-0860 distinguishes these components within a scope containing 2 entries. Match each branch to its own update documentation and functional check.
Which prerequisites does record CVE-2026-54798 specify?
For CVE-2026-54798, the published vector is CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N. Verify those conditions on CPCI85 Central Processing/Communication, SICORE Base system before applying them to an integration named in CERTFR-2026-AVI-0860.
Sources and related reading
- CERT-FR · CERTFR-2026-AVI-0860
- Vendor and remediation · cert-portal.siemens.com
- CVE-2026-54798 · CNA
Practical guide : Software inventory: prepare for end of support
Explore the decision addressed in this case
Complete source advisory inventory
The article table may be an extract. These lists contain every affected-system entry and CVE in the specified advisory revision. They are not an inventory of your assets and do not map every CVE to every product.
Official source · CERTFR-2026-AVI-0860
Advisory revision : · Checked on :
Affected systems · 2
Original French wording is retained to avoid ambiguous translations of version conditions.
- CPCI85 Central Processing/Communication versions antérieures à 26.20
- SICORE Base system versions antérieures à 26.20.0