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Fencer Intel
high 7.6

GHSA-43g4-487m-5q6m json

Open WebUI Vulnerable to a Session Fixation Attack

published last yr. modified 4mo ago also CVE-2024-7053 , PYSEC-2026-1720

cvss
7.6
version 3.0, GitHub
cisa kev
Not listed
not in CISA's catalog
epss
—
no score, EPSS covers CVEs only
public exploits
0
none known

Summary

A vulnerability in open-webui/open-webui version 0.3.8 allows an attacker with a user-level account to perform a session fixation attack. The session cookie for all users is set with the default `SameSite=Lax` and does not have the `Secure` flag enabled, allowing the session cookie to be sent over HTTP to a cross-origin domain. An attacker can exploit this by embedding a malicious markdown image in a chat, which, when viewed by an administrator, sends the admin's session cookie to the attacker's server. This can lead to a stealthy administrator account takeover, potentially resulting in remote code execution (RCE) due to the elevated privileges of administrator accounts.

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CVSS scores

assigned by version score vector
OSV 3.0 7.6 CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N
GitHub 3.0 7.6 CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N

Affected packages

ecosystem package affected fixed in
pypi open-webui
<=0.3.8
 no fix listed

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Intel 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.