CVE-2025-51865: Ai2 playground web service LLM chat · Insecure Direct Object Reference
Source CVE Database V5
Not known to be exploited · CVSS 8.8 High.
Data as of 26 Oct 2026, 17:16 UTC
- EPSS
- 0.4% chance of exploitation in 30 days – higher than 36% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HExploitation evidence
Disclosed: evidence found.
CVE published 22 Jul 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: 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 26 Oct 2026.
What to do
AI-suggested
To mitigate this vulnerability, organizations and the service provider should implement strict access control mechanisms on all direct object references, ensuring that users can only access resources they are authorized to view. This includes validating user permissions server-side before returning any data associated with thread keys. Employing non-predictable, opaque identifiers (e.g., UUIDs or cryptographically secure tokens) instead of sequential or guessable keys can reduce the risk of enumeration. Additionally, implementing rate limiting and anomaly detection on URL access patterns can help detect and block enumeration attempts. Regular security audits and penetration testing focused on IDOR vulnerabilities should be conducted. For organizations using the service, monitoring for unusual access patterns and promptly reporting suspicious activity to the service provider is advisable. Finally, the service provider should release patches or updates addressing this vulnerability and communicate remediation steps clearly to users.
Description
Ai2 playground web service (playground.allenai.org) LLM chat through 2025-06-03 is vulnerable to Insecure Direct Object Reference (IDOR), allowing attackers to gain sensitvie information via enumerating thread keys in the URL.