Authentication Bypass in gaizhenbiao/ChuanhuChatGPT

published 2025-03-20 19 mo ago modified 2026-06-17 4 mo ago also PYSEC-2025-97 , EUVD-2025-6872

cvss: 8.1; version 3.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.6%; EPSS 0.6% chance of exploitation in 30 days, percentile 50%
public exploits: 0; none known

An authentication bypass vulnerability exists in gaizhenbiao/ChuanhuChatGPT, as of commit 3856d4f, allowing any user to read and delete other users' chat history. The vulnerability arises because the username is provided via an HTTP request from the client side, rather than being read from a secure source like a cookie. This allows an attacker to pass another user's username to the get_model function, thereby gaining unauthorized access to that user's chat history.

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: total
Assessed: 19 mo ago (2025-03-20)

Exploit prediction

0.63% chance of exploitation in the next 30 days, higher than 50% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

huntr.com https://huntr.com/bounties/21e54c3f-e2d7-423b-9890-1f0cb99af4dd referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.0	8.1	CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
OSV	3.0	8.1	CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Affected packages

ecosystem	package	affected	fixed in
pypi	chuanhuchatgpt	<=2024-12-04	no fix listed

Affected products

gaizhenbiao gaizhenbiao/chuanhuchatgpt

Classification

Weakness

CWE-304 Missing Critical Step in Authentication

References

huntr.com /bounties/21e54c3f-e2d7-423b-9890-1f0cb99af4dd
exploit, third-party-advisory, evidence

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary