# CVE-2026-9661: Postecert FIRMAOK! 1.6.29 Local Privilege Escalation via OpenSSL Search Path

Status: published. Published: 2026-11-13. Updated: 2026-11-13.

Poste Italiane Postecert FIRMAOK! 1.6.29 on Windows contains a local privilege escalation vulnerability caused by an uncontrolled OpenSSL search path, where launcher.exe and dependent executables such as updater.exe and tslupdater.exe load OpenSSL configuration and library files from a hardcoded, user-writable directory that does not exist by default. A low-privileged local attacker can create this missing directory and place malicious OpenSSL configuration or library files inside it, causing the application to load and execute attacker-controlled code with the privileges of the user running it, enabling horizontal or, when a higher-privileged user runs the application, vertical privilege escalation up to full system compromise.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Poste Italiane / Postecert FIRMAOK!: 1.6.29 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 7.3 (high); CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 7 (high); CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H; source: CNA: VulnCheck

- CVSS 4.0: 7.3 (high); CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: disclosure@vulncheck.com

- CVSS 3.1: 7 (high); CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H; source: NVD: disclosure@vulncheck.com

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-427

## Exploit evidence

- exploit: https://seclists.org/fulldisclosure/2026/Nov/14 (CNA: VulnCheck)

## References

- https://seclists.org/fulldisclosure/2026/Nov/14 (CNA: VulnCheck; technical-description, exploit)

- https://postecert.poste.it/firma/download.shtml (CNA: VulnCheck; product)

- https://www.vulncheck.com/advisories/postecert-firmaok-local-privilege-escalation-via-openssl-search-path (CNA: VulnCheck; third-party-advisory)

- http://seclists.org/fulldisclosure/2026/Nov/14 (ADP: CVE)

- https://postecert.poste.it/firma/download.shtml (disclosure@vulncheck.com)

- https://seclists.org/fulldisclosure/2026/Nov/14 (disclosure@vulncheck.com)

- https://www.vulncheck.com/advisories/postecert-firmaok-local-privilege-escalation-via-openssl-search-path (disclosure@vulncheck.com)

- http://seclists.org/fulldisclosure/2026/Nov/14 (af854a3a-2127-422b-91ae-364da2661108)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-9661; retrieved 2026-11-13; source updated 2026-11-13

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-9661; retrieved 2026-11-14; source updated 2026-11-13

Revision: e8b2c7317033fdfceb13600821d172b0fa9004ca000082ed519321427e4afc48

Canonical: https://y2.dev/cve/CVE-2026-9661

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- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

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