ServerCo getssl ACME shell script path injection_CVE-2026-10303

7.4 / 10

HIGH

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

Description

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 path/filename usage during validation. An attacker who can supply ACME challenge responses to getssl (for example, a malicious or compromised CA endpoint, or an on-path adversary able to tamper with that response path) could exploit this to achieve unauthorized file write/path traversal effects, usually with elevated privileges, ultimately allowing for remote command injection. This issue appears related in spirit to CVE-2023-38198, and is an instance of CWE-73, "External control of file name or path." Other ACME shell script handlers may be affected by similar issues.

Basic Information

ID CVE-2026-10303

Source runZero

Published Jun 16, 2026 at 18:24

Affected Product

Vendor ServerCo

Product getssl

Affected Versions ServerCo getssl 0

CWE Classification

CWE-73

References

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    "description": "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 path/filename usage during validation. An attacker who can supply ACME challenge responses to getssl (for example, a malicious or compromised CA endpoint, or an on-path adversary able to tamper with that response path) could exploit this to achieve unauthorized file write/path traversal effects, usually with elevated privileges, ultimately allowing for remote command injection. This issue appears related in spirit to CVE-2023-38198, and is an instance of CWE-73, \"External control of file name or path.\" Other ACME shell script handlers may be affected by similar issues.",
    "published": "2026-06-16T18:24:43.712Z",
    "modified": "2026-06-16T18:24:43.712Z",
    "type": "cve",
    "title": "ServerCo getssl ACME shell script path injection",
    "source": "runZero",
    "references": "https://github.com/srvrco/getssl/pull/896\nhttps://remyhax.xyz/posts/reproducing-lawful-tls-wiretapping/\nhttps://www.cve.org/CVERecord?id=CVE-2023-38198\nhttps://www.runzero.com/advisories/serverco-getssl-acme-cmd-injection-cve-2026-10303/\nhttps://github.com/srvrco/getssl/releases/tag/v2.50",
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    "sourceData": "ServerCo getssl 0",
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