CVE-2026-10303
ServerCo getssl ACME shell script path injection
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.
INFO
Published Date :
June 16, 2026, 8:16 p.m.
Last Modified :
June 16, 2026, 8:47 p.m.
Remotely Exploit :
Yes !
Source :
44488dab-36db-4358-99f9-bc116477f914
Affected Products
The following products are affected by CVE-2026-10303
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 44488dab-36db-4358-99f9-bc116477f914 | ||||
| CVSS 3.1 | HIGH | MITRE-CVE |
Solution
- Update ServerCo getssl to the latest version.
- Apply vendor patches when available.
- Validate all ACME challenge tokens strictly.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-10303.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-10303 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-10303
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-10303 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-10303 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by 44488dab-36db-4358-99f9-bc116477f914
Jun. 16, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N Added CWE CWE-73 Added Reference https://github.com/srvrco/getssl/pull/896 Added Reference https://github.com/srvrco/getssl/releases/tag/v2.50 Added Reference https://remyhax.xyz/posts/reproducing-lawful-tls-wiretapping/ Added Reference https://www.cve.org/CVERecord?id=CVE-2023-38198 Added Reference https://www.runzero.com/advisories/serverco-getssl-acme-cmd-injection-cve-2026-10303/