GHSA-hp6r-r9vc-q8wx

Suggest an improvement
Source
https://github.com/advisories/GHSA-hp6r-r9vc-q8wx
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/12/GHSA-hp6r-r9vc-q8wx/GHSA-hp6r-r9vc-q8wx.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-hp6r-r9vc-q8wx
Aliases
Downstream
CGA (2)
MINI (1)
Published
2025-12-19T06:30:27Z
Modified
2026-09-10T03:50:31Z
Severity
  • 6.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N CVSS Calculator
  • 5.4 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:P CVSS Calculator
Summary
FastAPI SSP is vulnerable to Cross-site Request Forgery (CSRF) through improper OAuth parameter validation
Details

Versions of the package fastapi-sso before 0.19.0 are vulnerable to Cross-site Request Forgery (CSRF) due to the improper validation of the OAuth state parameter during the authentication callback. While the get_login_url method allows for state generation, it does not persist the state or bind it to the user's session. Consequently, the verify_and_process method accepts the state received in the query parameters without verifying it against a trusted local value. This allows a remote attacker to trick a victim into visiting a malicious callback URL, which can result in the attacker's account being linked to the victim's internal account.

Database specific 
{
    "cwe_ids":  [
        "CWE-285"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2025-12-19T21:08:32Z",
    "nvd_published_at":  "2025-12-19T05:16:09Z",
    "severity":  "MODERATE"
}
References

Affected packages

PyPI / fastapi-sso

Package

Name
fastapi-sso
View open source insights on deps.dev
Purl
pkg:pypi/fastapi-sso

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.19.0

Affected versions

0.*
0.2.1
0.2.2
0.2.3
0.2.4
0.2.5
0.2.6
0.2.7
0.2.8
0.2.9
0.2.10
0.2.11
0.2.12
0.2.13
0.3.0
0.4.0
0.5.0
0.5.1
0.6.1
0.6.2
0.6.3
0.6.4
0.7.0
0.7.1
0.7.2
0.7.3
0.7.4
0.8.0
0.9.0
0.9.1
0.10.0
0.11.0
0.12.0
0.12.1
0.12.2
0.13.0
0.13.1
0.14.0
0.14.1
0.14.2
0.15.0
0.16.0
0.17.0
0.18.0

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/12/GHSA-hp6r-r9vc-q8wx/GHSA-hp6r-r9vc-q8wx.json"