5.9Medium
Openclaw Openclaw
CVE-2026-28465
OpenClaw's voice-call plugin versions before 2026.2.3 contain an improper authentication vulnerability in webhook verification that allows remote attackers to bypass verification by supplying untrusted forwarded headers. Attackers can spoof webhook events by manipulating Forwarded or X-Forwarded-* headers in reverse-proxy configurations that implicitly trust these headers.
What this means for your business
- It affects Openclaw. It matters if your company, or a supplier that handles your data, runs it.
- An attacker can use it remotely, over a network, without a login, and without anyone at your company clicking anything.
- FIRST's prediction model gives it a 0.4% chance of attack attempts being seen in the next 30 days, ranking above 31% of all known flaws.
What to do
- 1Check whether your company or your suppliers run Openclaw, and which version. The affected versions are listed further down this page.
- 2If you do, apply the vendor's fix. A patch or vendor advisory has been published.
Not sure if your company is exposed?
Fastnexa’s certified penetration testers can check whether attackers could use this flaw, or others like it, against your websites, apps and network. The full test is free for our first 10 founding clients until 31 December 2026.
Scoring
- CVSS
- 5.9 (v3.1)
- Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N- CVSS v4
- 8.2
- Weakness
- CWE-290
- Assigned by
- disclosure@vulncheck.com
Dates
- Published
- 2026-03-05
- Last modified
- 2026-09-17
- Sources
- NVD
Affected products
- Openclaw Openclaw- 2026.2.3
As listed in the NVD configuration data. Not a statement about your estate.