What is CVE-2026-10303?

CVE-2026-10303 is a high-severity vulnerability in Serverco Getssl, classified under External Control of File Name or Path. CVSS score: 7.4/10. Published 2026-06-16.

How severe is CVE-2026-10303?

High severity. CVSS v3 base score is 7.4 out of 10.

Vulnerability in Serverco Getssl

CVE-2026-10303

In ServerCo getssl version 2.49 and prior, the ACME challenge token returned to the client was not strictly validated against RFC 8555 before being used in challenge-file handling, allowing a maliciously crafted token to influence local pa…

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

Serverco Getssl — versions 0

Weakness classification (CWE)

CWE-73 — External Control of File Name or Path

References

44488dab-36db-4358-99f9-bc116477f914 (mitigation)
44488dab-36db-4358-99f9-bc116477f914 (related)
44488dab-36db-4358-99f9-bc116477f914 (related)
44488dab-36db-4358-99f9-bc116477f914 (third-party-advisory)
44488dab-36db-4358-99f9-bc116477f914 (release-notes)

Frequently asked questions

What is CVE-2026-10303?: CVE-2026-10303 is a high-severity vulnerability in Serverco Getssl, classified under External Control of File Name or Path. CVSS score: 7.4/10. Published 2026-06-16.
How severe is CVE-2026-10303?: High severity. CVSS v3 base score is 7.4 out of 10.