Auth bypass in Paperclipai Paperclip
CVE-2026-77087
Paperclip before 0.3.1 in default local_trusted mode fails to validate Host headers, allowing attackers to execute arbitrary commands via DNS rebinding. An attacker can craft a malicious webpage that, when visited by a developer running Paperclip locally, uses DNS rebinding to make authenticated API requests and execute commands through the process adapter.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (39.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 39.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.001
Affected products
Weakness classification (CWE)
References
- GitHub Security Advisory (GHSA-x8hx-rhr2-9rf7) (vendor-advisory)
- VulnCheck Advisory: Paperclip before 0.3.1 Remote Code Execution via DNS Rebinding (third-party-advisory)
Frequently asked questions
- What is CVE-2026-77087?
- CVE-2026-77087 is a critical-severity vulnerability in Paperclipai Paperclip, classified under Missing Authorization. CVSS score: 9.6/10. Published 2026-08-21.
- How severe is CVE-2026-77087?
- Critical severity. CVSS v3 base score is 9.6 out of 10.