Vulnerability · Published Oct 11, 2026 · Assigned by VulnCheck
CVE-2026-108839thClaws through 0.141.0 Symlink Following File Write via POST /v1/inputs
Medium 4.2
In plain English
A medium-severity security flaw in thClaws from thClaws. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities).
Severity (CVSS 3.1)4.2Medium
Exploit odds (30 days)0.3%top 83.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
thClaws through 0.141.0 contains a link-following vulnerability in the post_inputs handler of the v1 API POST /v1/inputs endpoint that allows writes outside the workspace by following symlinks. Attackers who plant a symlink under the allowed inputs/ prefix can cause later authenticated uploads to write or truncate files outside the workspace with daemon privileges.
Affected products (as reported)
Weakness: CWE-59 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:L
References
- https://hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/thclaws-api-inputs-symlink-escape third-party-advisory
- https://github.com/thClaws/thClaws/blob/v0.141.0/crates/core/src/api_v1/artifacts.rs#L335-L420 technical-description
- https://github.com/thClaws/thClaws product
- VulnCheck Advisory: thClaws through 0.141.0 Symlink Following File Write via POST /v1/inputs third-party-advisory