CVE-2026-91203
MEDIUMDescription
A flaw was found in cockpit-files. This vulnerability allows a local attacker to exploit a timing issue, known as a symlink race condition, during privileged file operations such as changing file ownership or permissions. By manipulating directory entries and winning this race, the attacker can redirect these operations to unintended files. This could lead to unauthorized changes in file ownership and permissions on arbitrary files, potentially compromising system integrity and availability by altering system or application states or rendering services unusable.
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:H
Exploit Intelligence
Low risk: more likely to be exploited than 1% of all known CVEs.
References
Related Vulnerabilities
Other CWE-363 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2022-21658 | High | 7.3 | 1.4% | - | Fix |
| CVE-2025-31133 | High | 7.8 | 0.8% | - | Fix |
| CVE-2025-52881 | High | 7.5 | 0.6% | - | Fix |
| CVE-2025-52565 | High | 7.5 | 0.6% | - | Fix |
| CVE-2024-27102 | Critical | 9.9 | 0.5% | - | Fix |
| CVE-2024-45310 | Low | 3.6 | 0.3% | - | Fix |
Common questions
How do I fix CVE-2026-91203?
Upgrade cockpit-files on debian unstable to 45-1 or later.
Is CVE-2026-91203 being actively exploited?
Not that we know of. CVE-2026-91203 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.11% is the estimated probability that it will be exploited in the next 30 days. That is higher than 1% of all scored CVEs.
How severe is CVE-2026-91203?
CVE-2026-91203 has a CVSS v3 base score of 6.0, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2026-91203 affect?
Published advisories record a fix for cockpit-files (Debian). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
Embed a live status badge for CVE-2026-91203
Markdown
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-09-22.