CVE-2026-54369: acl < 2.4.0 Symlink Traversal Privilege Escalation via libacl Functions

highCVSS 7.1CVE-2026-54369

CSIRTS triage

vendor: null product: acl Privilege escalationaffected: < 2.4.0

What: Symlink Traversal Privilege Escalation via libacl Functions affects acl versions below 2.4.0.
Who is affected: Deployments using acl versions less than 2.4.0 are affected.
Urgency: Remediation is urgent due to the high severity with a CVSS score of 7.1.
Action: Upgrade acl to version 2.4.0 or later.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 7.1
Published: 2026-06-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54369

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-543690.14% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 4% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-54369	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

highCVE-2026-54369: acl before version 2.4.0 contains a symlink traversal vulnerability in the libacl pathname-bas…nvd

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