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Luu, T.J.

🔥 This vulnerability is being actively exploited in the wild (CISA Known Exploited Vulnerabilities catalog)

CVE-2026-87886: Acronis Backup Incorrect Default Permissions Vulnerability

infovulnerability🔥 Actively Exploited

security

Source: CISA Known Exploited VulnerabilitiesSeptember 15, 2026CVE-2026-87886

Summary

Acronis Backup, a plugin for cPanel & WHM and extension for Plesk, has a vulnerability where it uses incorrect default permissions that could allow privilege escalation (gaining unauthorized higher-level access to a system). This vulnerability is currently being exploited by attackers in real-world attacks.

Solution / Mitigation

Apply mitigations according to vendor instructions at https://security-advisory.acronis.com/advisories/SEC-10986, following CISA's BOD 26-04 guidance for prioritizing security updates. If mitigations are unavailable, discontinue use of the product. The deadline for action is 2026-09-19.

Vulnerability Details

EPSS (30-day exploit probability)

EPSS: 0.0%

Patch Available

Yes

Exploit Maturity

🔥 Actively Exploited

Disclosure Date

September 15, 2026

Classification

Attack SophisticationModerate

Taxonomy References

CWE (Weakness Type)

CWE-276

Monthly digest — independent AI security research

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-87886

First tracked: September 16, 2026 at 08:00 PM

Classified by LLM (prompt v3) · confidence: 95%