How severe is CVE-2023-24720?

CVE-2023-24720 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-24720 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-24720?

CVE-2023-24720 affects Readium Readium-js. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-24720?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2023-24720 published?

CVE-2023-24720 was published on 2023-04-05 and last updated on 2026-06-17.

CVE-2023-24720

CVE-2023-24720 is a critical-severity vulnerability in Readium Readium-js with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-434.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-434
Affected product: Readium Readium-js
Published: 2023-04-05
Last modified: 2026-06-17

Description

An arbitrary file upload vulnerability in readium-js v0.32.0 allows attackers to execute arbitrary code via uploading a crafted EPUB file.

Frequently asked questions

What is CVE-2023-24720?: An arbitrary file upload vulnerability in readium-js v0.32.0 allows attackers to execute arbitrary code via uploading a crafted EPUB file.
How severe is CVE-2023-24720?: CVE-2023-24720 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-24720 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-24720?: CVE-2023-24720 affects Readium Readium-js. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-24720?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2023-24720 published?: CVE-2023-24720 was published on 2023-04-05 and last updated on 2026-06-17.

References

https://infosec.zeyu2001.com/2023/readiumjs-cloud-reader-everybody-gets-an-xss

Affected products (1)

cpe:2.3:a:readium:readium-js:0.32.0:*:*:*:*:*:*:*

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