Is CVE-2026-100540 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-100540 being exploited in the wild.

How severe is CVE-2026-100540?

Medium severity, with a CVSS score of 6.8, published 26 September 2026.

Which products and versions are affected?

Openclaw Feishu before 2026.8.1.

Is there a fix for CVE-2026-100540?

A patch was published on 2026-08-01: Patched version 2026.8.1 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-100540 attacked?

It is attacked over the network.

Am I affected by CVE-2026-100540?

Check whether you run Openclaw Feishu at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-100540: OpenClaw Feishu authorization check bypass in account validation

CVE-2026-100540 · Severity: medium · CVSS 6.8 · Published 2026-09-26

OpenClaw Feishu is a tool integration library that allows models to interact with Feishu (a workplace collaboration platform) to read and modify resources. The vulnerability allows attackers to exploit multi-account setups by using a disabled account's credentials to access Feishu resources that an administrator intended to revoke, potentially leading to unauthorized data access or modification.

Technologies: Openclaw Feishu. Vendors: Openclaw.

Quick answers

Is CVE-2026-100540 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-100540 being exploited in the wild.
How severe is CVE-2026-100540?: Medium severity, with a CVSS score of 6.8, published 26 September 2026.
Which products and versions are affected?: Openclaw Feishu before 2026.8.1.
Is there a fix for CVE-2026-100540?: A patch was published on 2026-08-01: Patched version 2026.8.1 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-100540 attacked?: It is attacked over the network.
Am I affected by CVE-2026-100540?: Check whether you run Openclaw Feishu at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The Feishu model tool fails to validate whether a configured default account is disabled before selecting it for operations, a classic authorization check bypass (CWE-863). In multi-account setups, a disabled default account can retain its credentials and be used for tool invocations while an enabled sibling account keeps the tool family available. Exploitation requires a specific configuration where both disabled and enabled sibling accounts exist, and an attacker can trigger model tool calls.

Affected products

OpenClaw Feishu before 2026.8.1

Timeline

2026-09-26: disclosed
2026-08-01: patched: Patched version 2026.8.1

References

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