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High

Lord of Large Language Models vulnerable to Observable Discrepancy attack via authenticate_user function

  • Disclosed: 07.07.2025
  • Updated: 11.10.2026 13:18

The parisneo/lollms repository is affected by a timing attack vulnerability in the authenticate_user function within the lollms_authentication.py file. This vulnerability allows attackers to enumerate valid usernames and guess passwords incrementally by analyzing response time differences. The affected version is the latest, and the issue is resolved in commit f78437f. The vulnerability arises from the use of Python's default string equality operator for password comparison, which compares characters sequentially and exits on the first mismatch, leading to variable response times based on the number of matching initial characters.

Affected software

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PlatformPackageVulnerable versionsFixed in
Python (PyPI) lollms <= 11.0.0 no fix

References

CVSS score 7.5/10
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness (CWE)
CWE-203
Platform
Python (PyPI)
Package
lollms
Disclosed
07.07.2025
Updated
11.10.2026 13:18

Sources and licenses

OSV / GitHub Advisory Database - PYSEC-2026-1590 - PyPA Advisory Database; CC BY 4.0

OSV / GitHub Advisory Database - GHSA-j5pr-vrjj-9v4h - CC BY 4.0

Vulnerability history: lollms

All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (24) in the archive
Total entries
24
First → latest
05.2024 04.2026
Without a fix
9
Exploited in attacks
0

Severity breakdown

  • Critical 6
  • High 12
  • Medium 5
  • Low 1

Disclosures per year

Severity:
  1. parisneo/lollms vulnerable to stored XSS in the social feature
    Critical · 9.6 CVE-2026-1115 < 2.2.0 2.2.0
  2. In parisneo/lollms version 2.1.0, the application's session management is vulnerable to improper access control due to the use of a weak secret key for signing JSON Web Tokens (JWT). This vulnerabilit
    Critical · 9.8 CVE-2026-1114 <= 2.1.0 no fix
  3. A Server-Side Request Forgery (SSRF) vulnerability exists in parisneo/lollms versions prior to 2.2.0, specifically in the `/api/files/export-content` endpoint. The `_download_image_to_temp()` function
    High · 7.5 CVE-2026-0560 < 2.1.1 2.1.1
  4. A critical security vulnerability in parisneo/lollms versions up to 2.2.0 allows any authenticated user to accept or reject friend requests belonging to other users. The `respond_request()` function i
    High · 8.3 CVE-2026-0562 < 2.1.1 2.1.1
  5. A vulnerability in parisneo/lollms, up to and including version 2.2.0, allows unauthenticated users to upload and process files through the `/api/files/extract-text` endpoint. This endpoint does not e
    Critical · 9.8 CVE-2026-0558 < 2.1.1 2.1.1
  6. Lollms has an Improper Access Control vulnerability
    High · 8.2 CVE-2026-1117 < 2.1.0 2.1.0
  7. Lord of Large Language Models vulnerable to Observable Discrepancy attack via authenticate_user function this entry
    High · 7.5 CVE-2025-6386 <= 11.0.0 no fix
  8. LoLLMS Code Injection vulnerability
    High · 8.4 CVE-2024-6982 < 11.0.0 11.0.0
  9. A vulnerability in the discussion image upload function of the Lollms application, version v9.9, allows for the uploading of SVG files. Due to incomplete filtering in the sanitize_svg function, this c
    Critical · 9.0 CVE-2024-6581 all versions no fix
  10. LoLLMS vulnerable to Expected Behavior Violation
    High · 7.3 CVE-2024-6281 < 9.5.1 9.5.1
  11. lollms vulnerable to path traversal due to unauthenticated root folder settings change
    High · 8.6 CVE-2024-6085 <= 9.5.1 no fix
  12. lollms vulnerable to dot-dot-slash path traversal in XTTS server
    High · 7.3 CVE-2024-6139 <= 9.5.1 no fix
  13. lollms path traversal vulnerability allows overriding of config.yaml file, leading to RCE
    High · 7.4 CVE-2024-5824 < 9.5.0 9.5.0
  14. Remote Code Execution via path traversal bypass in lollms
    Critical · 9.8 CVE-2024-5443 >= 5.9.0, < 9.5.1 9.5.1
  15. parisneo/lollms Local File Inclusion (LFI) attack
    Critical · 9.1 CVE-2024-4315 < 9.5.0 9.5.0
  16. LoLLMS Path Traversal vulnerability
    High · 9.8 CVE-2024-3429 < 9.5.0 9.5.0
  17. A path traversal vulnerability exists in the parisneo/lollms application, affecting version 9.4.0 and potentially earlier versions, but fixed in version 5.9.0. The vulnerability arises due to improper
    High · 7.5 CVE-2024-4881 < 5.9.0 5.9.0
  18. LoLLMS Command Injection vulnerability
    High · 9.8 CVE-2024-4078 < 9.5.0 9.5.0

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