CVE-2026-25221
PolarLearn has Multiple Login CSRFs via Missing OAuth state Parameter (GitHub & Google)
Description
PolarLearn is a free and open-source learning program. In 0-PRERELEASE-15 and earlier, the OAuth 2.0 implementation for GitHub and Google login providers is vulnerable to Login Cross-Site Request Forgery (CSRF). The application fails to implement and verify the state parameter during the authentication flow. This allows an attacker to pre-authenticate a session and trick a victim into logging into the attacker's account. Any data the victim then enters or academic progress they make is stored on the attacker's account, leading to data loss for the victim and information disclosure to the attacker.
INFO
Published Date :
Feb. 2, 2026, 11:16 p.m.
Last Modified :
Feb. 20, 2026, 8:45 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-25221
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | LOW | [email protected] |
Solution
- Verify the state parameter during OAuth 2.0 authentication.
- Ensure state parameter integrity.
- Update PolarLearn to version 0-PRERELEASE-16 or later.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-25221.
| URL | Resource |
|---|---|
| https://github.com/polarnl/PolarLearn/commit/44669bbb5b647c7625f22dd82f3121c7d7bfbe19 | Patch |
| https://github.com/polarnl/PolarLearn/security/advisories/GHSA-fhhm-574m-7rpw | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-25221 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-25221
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-25221 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-25221 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Reanalysis by [email protected]
Feb. 20, 2026
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:a:plarnl:polarlearn:-:*:*:*:*:*:*:* OR *cpe:2.3:a:polarlearn:polarlearn:-:*:*:*:*:*:*:* -
Initial Analysis by [email protected]
Feb. 20, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N Added CPE Configuration OR *cpe:2.3:a:plarnl:polarlearn:-:*:*:*:*:*:*:* Added Reference Type GitHub, Inc.: https://github.com/polarnl/PolarLearn/commit/44669bbb5b647c7625f22dd82f3121c7d7bfbe19 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/polarnl/PolarLearn/security/advisories/GHSA-fhhm-574m-7rpw Types: Exploit, Vendor Advisory -
New CVE Received by [email protected]
Feb. 02, 2026
Action Type Old Value New Value Added Description PolarLearn is a free and open-source learning program. In 0-PRERELEASE-15 and earlier, the OAuth 2.0 implementation for GitHub and Google login providers is vulnerable to Login Cross-Site Request Forgery (CSRF). The application fails to implement and verify the state parameter during the authentication flow. This allows an attacker to pre-authenticate a session and trick a victim into logging into the attacker's account. Any data the victim then enters or academic progress they make is stored on the attacker's account, leading to data loss for the victim and information disclosure to the attacker. Added CVSS V4.0 AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-352 Added Reference https://github.com/polarnl/PolarLearn/commit/44669bbb5b647c7625f22dd82f3121c7d7bfbe19 Added Reference https://github.com/polarnl/PolarLearn/security/advisories/GHSA-fhhm-574m-7rpw