How severe is CVE-2026-25885?

CVE-2026-25885 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 none, integrity high, and availability none.

Is CVE-2026-25885 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-25885?

CVE-2026-25885 affects Polarlearn. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-25885?

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-2026-25885 have an EU (EUVD) identifier?

Yes. CVE-2026-25885 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-6867.

When was CVE-2026-25885 published?

CVE-2026-25885 was published on 2026-02-09 and last updated on 2026-06-17.

CVE-2026-25885

CVE-2026-25885 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-285.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 10.0
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-6867
Weakness: CWE-285
Affected product: Polarlearn
Published: 2026-02-09
Last modified: 2026-06-17

Description

PolarLearn is a free and open-source learning program. In 0-PRERELEASE-16 and earlier, the group chat WebSocket at wss://polarlearn.nl/api/v1/ws can be used without logging in. An unauthenticated client can subscribe to any group chat by providing a group UUID, and can also send messages to any group. The server accepts the message and stores it in the group’s chatContent, so this is not just a visual spam issue.

Frequently asked questions

What is CVE-2026-25885?: PolarLearn is a free and open-source learning program. In 0-PRERELEASE-16 and earlier, the group chat WebSocket at wss://polarlearn.nl/api/v1/ws can be used without logging in. An unauthenticated client can subscribe to any group chat by providing a group UUID, and can also send messages to any group. The server accepts the message and stores it in the group’s chatContent, so this is not just a visual spam issue.
How severe is CVE-2026-25885?: CVE-2026-25885 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 none, integrity high, and availability none.
Is CVE-2026-25885 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-25885?: CVE-2026-25885 affects Polarlearn. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-25885?: 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-2026-25885 have an EU (EUVD) identifier?: Yes. CVE-2026-25885 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-6867.
When was CVE-2026-25885 published?: CVE-2026-25885 was published on 2026-02-09 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…
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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-2026-25222 — 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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