How severe is CVE-2026-25222?

CVE-2026-25222 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-25222 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-25222?

CVE-2026-25222 affects Polarlearn. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-25222?

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-2026-25222 have an EU (EUVD) identifier?

Yes. CVE-2026-25222 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5344.

When was CVE-2026-25222 published?

CVE-2026-25222 was published on 2026-02-02 and last updated on 2026-06-17.

CVE-2026-25222

CVE-2026-25222 is a high-severity vulnerability in Polarlearn with a CVSS 3.x base score of 7.5. 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-200.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 6.3
EPSS exploit prediction: 0% (33rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-5344
Weakness: CWE-200
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, a timing attack vulnerability in the sign-in process allows unauthenticated attackers to determine if a specific email address is registered on the platform. By measuring the response time of the login endpoint, an attacker can distinguish between valid and invalid email addresses. This occurs because the server only performs the computationally expensive Argon2 password hashing if the user exists in the database. Requests for existing users take significantly longer (~650ms) than requests for non-existent users (~160ms).

Frequently asked questions

What is CVE-2026-25222?: PolarLearn is a free and open-source learning program. In 0-PRERELEASE-15 and earlier, a timing attack vulnerability in the sign-in process allows unauthenticated attackers to determine if a specific email address is registered on the platform. By measuring the response time of the login endpoint, an attacker can distinguish between valid and invalid email addresses. This occurs because the server only performs the computationally expensive Argon2 password hashing if the user exists in the database. Requests for existing users take significantly longer (~650ms) than requests for non-existent users (~160ms).
How severe is CVE-2026-25222?: CVE-2026-25222 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-25222 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-25222?: CVE-2026-25222 affects Polarlearn. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-25222?: 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-2026-25222 have an EU (EUVD) identifier?: Yes. CVE-2026-25222 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5344.
When was CVE-2026-25222 published?: CVE-2026-25222 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-2026-25221 — High (CVSS 8.1): PolarLearn is a free and open-source learning program. In 0-PRERELEASE-15 and earlier, the OAuth 2.0 implementation for…
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-2026-25126 — High (CVSS 7.1): PolarLearn is a free and open-source learning program. Prior to version 0-PRERELEASE-15, the vote API route (`POST…

All CVEs affecting Polarlearn →

Other CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor) vulnerabilities

CVE-2026-27604 — Critical (CVSS 10.0): FOSSBilling is a free, open-source billing and client management system. Starting in version 0.5.4 and prior to version…
CVE-2026-40965 — Critical (CVSS 10.0): Cloud Foundry UAA versions v76.12.0 through v78.12.0 are vulnerable to a private key exposure. The server contains a…
CVE-2026-42826 — Critical (CVSS 10.0): Exposure of sensitive information to an unauthorized actor in Azure DevOps allows an unauthorized attacker to disclose…
CVE-2025-29270 — Critical (CVSS 10.0): Incorrect access control in the realtime.cgi endpoint of Deep Sea Electronics devices DSE855 v1.1.0 to v1.1.26 allows…
CVE-2025-61481 — Critical (CVSS 10.0): An issue in MikroTik RouterOS v.7.14.2 and SwOS v.2.18 exposes the WebFig management interface over cleartext HTTP by…
CVE-2025-53624 — Critical (CVSS 10.0): The Docusaurus gists plugin adds a page to your Docusaurus instance, displaying all public gists of a GitHub user.…

Browse all CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor) vulnerabilities →