How severe is CVE-2026-25221?

CVE-2026-25221 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-25221 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-25221?

CVE-2026-25221 affects Polarlearn. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-25221?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-25221 have an EU (EUVD) identifier?

Yes. CVE-2026-25221 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5181.

When was CVE-2026-25221 published?

CVE-2026-25221 was published on 2026-02-02 and last updated on 2026-06-17.

CVE-2026-25221

CVE-2026-25221 is a high-severity vulnerability in Polarlearn with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-352.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v4: 2.3
EPSS exploit prediction: 0% (10th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-5181
Weakness: CWE-352
Affected product: Polarlearn
Published: 2026-02-02
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-25221?: 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.
How severe is CVE-2026-25221?: CVE-2026-25221 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-25221 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-25221?: CVE-2026-25221 affects Polarlearn. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-25221?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-25221 have an EU (EUVD) identifier?: Yes. CVE-2026-25221 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5181.
When was CVE-2026-25221 published?: CVE-2026-25221 was published on 2026-02-02 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:polarlearn:polarlearn:-:*:*:*:*:*:*:*

More vulnerabilities in Polarlearn

CVE-2026-39322 — High (CVSS 8.8): PolarLearn is a free and open-source learning program. In 0-PRERELEASE-15 and earlier, POST /api/v1/auth/sign-in…
CVE-2026-35610 — High (CVSS 8.8): PolarLearn is a free and open-source learning program. In 0-PRERELEASE-14 and earlier, setCustomPassword(userId,…
CVE-2026-25885 — High (CVSS 7.5): PolarLearn is a free and open-source learning program. In 0-PRERELEASE-16 and earlier, the group chat WebSocket at…
CVE-2026-25222 — High (CVSS 7.5): PolarLearn is a free and open-source learning program. In 0-PRERELEASE-15 and earlier, a timing attack vulnerability in…
CVE-2026-25126 — High (CVSS 7.1): PolarLearn is a free and open-source learning program. Prior to version 0-PRERELEASE-15, the vote API route (`POST…

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