Is CVE-2024-8856 in the CISA KEV catalog?

No. CVE-2024-8856 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2024-8856?

CVE-2024-8856 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2024-8856?

CVE-2024-8856 has an EPSS score of 93.71% (100th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2024-8856?

Upgrade backup and staging by wp time capsule to 1.22.22 or later.

CVE & CISA-KEV Catalog

CVE-2024-8856

CRITICALEPSS 100th pctl

9.8

CVSS v3

NVD

Description

The Backup and Staging by WP Time Capsule plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the the UploadHandler.php file and no direct file access prevention in all versions up to, and including, 1.22.21. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible.

CWE-434Unrestricted File Upload

How to fix

Remediation Available

backup and staging by wp time capsuleNVD

Affected:< 1.22.22Fixed in:1.22.22CVE-2024-8856derived from NVD

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

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

93.71%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

References

Patch2

Third-Party Advisory1

wordfence.com

Product2

Related Vulnerabilities

Other CWE-434 (Unrestricted File Upload) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2017-12617	High	8.1	100%	KEV	Fix
CVE-2018-15961	Critical	9.8	100%	KEV	-
CVE-2021-31207	Medium	6.6	100%	KEV + Ransom	Fix
CVE-2017-12615	High	8.1	100%	KEV + Ransom	-
CVE-2025-31324	Critical	10.0	99%	KEV + Ransom	-
CVE-2024-50623	Critical	9.8	99%	KEV + Ransom	Fix

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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 2025-07-09.