Missing authentication in 99AI exposes all users' chat logs
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-306.
Summary
99AI through 4.3.0 is affected by a missing authentication flaw (CWE-306) in the POST /api/chatLog/exportExcel route. An unauthenticated remote attacker can export the chat logs of all users as xlsx files containing usernames, emails, prompts, and AI answers.
Written with Claude Haiku 5.5 from the sources below · 2026-10-28
Description from the CNA
99AI through 4.3.0 contains a missing authentication vulnerability in the POST /api/chatLog/exportExcel route that allows unauthenticated attackers to export all users' chat logs. Attackers can send requests with controlled page, size, and optional email fields to download xlsx files containing usernames, emails, prompts, and AI answers.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
The sources list no fixed version for 99AI.
Written with Claude Haiku 5.5 from the sources below · 2026-10-28
Timeline
- 2026-10-16 Threatist record created from CVE-2026-111706
- 2026-10-16 Alias added: GHSA-q472-g8p5-86fq
- 2026-10-18 CISA SSVC decision points changed
References
More vastxie vulnerabilities
- TI-2026-75493 Insecure direct object reference in 99AI exposes chat messages CVSS 4.0MEDIUM 6.9
Sources
- CVE-2026-111706 · CVE Program
- CVE-2026-111706 · NVD
- FIRST EPSS
- GHSA-q472-g8p5-86fq · GitHub Advisory Database · CC BY 4.0
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