How severe is CVE-2025-66203?

CVE-2025-66203 has a CVSS 3.x base score of 9.9, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-66203 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-66203?

CVE-2025-66203 affects Lemon8866 Streamvault. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-66203?

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.

Does CVE-2025-66203 have an EU (EUVD) identifier?

Yes. CVE-2025-66203 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-205468.

When was CVE-2025-66203 published?

CVE-2025-66203 was published on 2025-12-27 and last updated on 2026-06-17.

CVE-2025-66203

CVE-2025-66203 is a critical-severity vulnerability in Lemon8866 Streamvault with a CVSS 3.x base score of 9.9. 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-78.

Key facts

Severity: Critical (CVSS 3.x base score 9.9)
EPSS exploit prediction: 1% (48th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-205468
Weakness: CWE-78
Affected product: Lemon8866 Streamvault
Published: 2025-12-27
Last modified: 2026-06-17

Description

StreamVault is a video download integration solution. Prior to version 251126, a Remote Code Execution (RCE) vulnerability exists in the stream-vault application (SpiritApplication). The application allows administrators to configure yt-dlp arguments via the /admin/api/saveConfig endpoint without sufficient validation. These arguments are stored globally and subsequently used in YtDlpUtil.java when constructing the command line to execute yt-dlp. This issue has been patched in version 251126.

Frequently asked questions

What is CVE-2025-66203?: StreamVault is a video download integration solution. Prior to version 251126, a Remote Code Execution (RCE) vulnerability exists in the stream-vault application (SpiritApplication). The application allows administrators to configure yt-dlp arguments via the /admin/api/saveConfig endpoint without sufficient validation. These arguments are stored globally and subsequently used in YtDlpUtil.java when constructing the command line to execute yt-dlp. This issue has been patched in version 251126.
How severe is CVE-2025-66203?: CVE-2025-66203 has a CVSS 3.x base score of 9.9, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-66203 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-66203?: CVE-2025-66203 affects Lemon8866 Streamvault. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-66203?: 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.
Does CVE-2025-66203 have an EU (EUVD) identifier?: Yes. CVE-2025-66203 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-205468.
When was CVE-2025-66203 published?: CVE-2025-66203 was published on 2025-12-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:lemon8866:streamvault:*:*:*:*:*:*:*:*

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