CVE-2026-125331: harnessrouter · Missing Authorization
Affects harnessrouterSource CVE Database V5
Not known to be exploited · CVSS 9.1 Critical : upgrade to 0.31.8 as a priority.
Data as of 10 Nov 2026, 18:50 UTC
Thin evidence
One scorer or none| CNA (GitHub_M) | CVSS 3.1 | 9.1 |
|---|
- Patch
- Available – fixed in 0.31.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:NExploitation evidence
Disclosed: evidence found.
CVE published 10 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 10 Nov 2026.
What to do
Upgrade harnessrouter to 0.31.8.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| HarnessRouterharnessrouter | Affected
| Fixed in
|
Description
HarnessRouter is a self-hosted unified API for running agent harnesses with sessions, streaming, files, cancellation, and failure handling. Prior to 0.31.8, a console that is not in self-hosted mode attaches the server's internal key to requests carrying an Authorization header before validating the bearer, while the service-only PUT and GET /v1/orgs/{org}/connections/{name}, PUT /v1/orgs/{org}/policy/{backend}, and /internal/* routes trust that key and take the organization from the URL. In a multi-organization deployment, a remote caller can use a made-up bearer to rewrite another organization's provider connection to an attacker-controlled endpoint, causing later prompts to be disclosed and attacker-controlled responses to influence tasks. This issue is fixed in version 0.31.8.
References
- github.com/HarnessRouter/harnessrouter/security/advisories/GHSA-p6cq-54cg-8mpv (opens in a new tab)
- github.com/HarnessRouter/harnessrouter/pull/418 (opens in a new tab)
- github.com/HarnessRouter/harnessrouter/commit/28609ec65ed671112d7e5418926bbd3cb3b25c00 (opens in a new tab)
- github.com/HarnessRouter/harnessrouter/releases/tag/v0.31.8 (opens in a new tab)