vanna-ai vanna Improper Authorization Vulnerability (CVE-2026-6977)

A security vulnerability, identified as CVE-2026-6977, has been discovered in vanna-ai vanna versions up to 2.0.2. The vulnerability resides within an unspecified function of the Legacy Flask API component. Successful exploitation of this flaw leads to improper authorization, potentially granting unauthorized access to sensitive resources or functionalities. The vulnerability is remotely exploitable and a proof-of-concept exploit is publicly available. The vendor was contacted but did not respond. This vulnerability poses a risk to systems utilizing the affected versions of vanna-ai vanna, as attackers could leverage it to bypass intended access controls.

Attack Chain

1. Attacker identifies a vulnerable vanna-ai vanna instance running version 2.0.2 or earlier.
2. Attacker crafts a malicious HTTP request targeting the Legacy Flask API. The specific endpoint and parameters involved are not defined in the source material.
3. The crafted request exploits the improper authorization vulnerability (CVE-2026-6977) within the Legacy Flask API.
4. Due to the improper authorization flaw, the attacker’s request bypasses the intended access controls.
5. The vulnerable application grants the attacker unauthorized access to resources or functionalities that should be restricted.
6. Depending on the accessed resources, the attacker may gain access to sensitive data, modify system settings, or perform other unauthorized actions.
7. The attacker may escalate privileges or move laterally within the affected system if further vulnerabilities exist or if the compromised application has elevated permissions.

Impact

Successful exploitation of CVE-2026-6977 allows a remote attacker to bypass authorization checks in vanna-ai vanna, potentially leading to unauthorized access to sensitive data or functionality. Given that a public exploit exists, organizations utilizing affected versions of vanna-ai vanna are at increased risk. The lack of vendor response further exacerbates the risk, as no official patch or mitigation guidance is available.

Recommendation

• Monitor web server logs for suspicious activity targeting the Legacy Flask API in vanna-ai vanna, using a webserver category Sigma rule focused on unusual HTTP requests.
• Apply generic hardening and input validation techniques to mitigate the impact of potential exploits targeting web applications.
• Investigate and validate the activity from the VulDB references provided in this brief.