How severe is CVE-2026-34907?

CVE-2026-34907 has a CVSS 4.0 base score of 5.1, rated medium severity.

Is CVE-2026-34907 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.

How do I fix CVE-2026-34907?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-34907 have an EU (EUVD) identifier?

Yes. CVE-2026-34907 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33903.

When was CVE-2026-34907 published?

CVE-2026-34907 was published on 2026-06-02 and last updated on 2026-06-17.

CVE-2026-34907

CVE-2026-34907 is a medium-severity vulnerability with a CVSS 4.0 base score of 5.1. 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-79.

Key facts

Severity: Medium (CVSS 4.0 base score 5.1)
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-33903
Weakness: CWE-79
Published: 2026-06-02
Last modified: 2026-06-17

Description

Wirtualna Uczelnia is vulnerable to Reflected Cross‑Site Scripting (XSS) due to insecure handling of the locale parameter across multiple endpoints. An attacker can craft a malicious URL with JavaScript embedded in the locale parameter and send it to a victim. When the victim opens the link, the injected script will be executed in their browser. This issue affects Wirtualna Uczelnia versions up to wu#2016.437.295#0#20260327_105545

Frequently asked questions

What is CVE-2026-34907?: Wirtualna Uczelnia is vulnerable to Reflected Cross‑Site Scripting (XSS) due to insecure handling of the locale parameter across multiple endpoints. An attacker can craft a malicious URL with JavaScript embedded in the locale parameter and send it to a victim. When the victim opens the link, the injected script will be executed in their browser. This issue affects Wirtualna Uczelnia versions up to wu#2016.437.295#0#20260327_105545
How severe is CVE-2026-34907?: CVE-2026-34907 has a CVSS 4.0 base score of 5.1, rated medium severity.
Is CVE-2026-34907 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.
How do I fix CVE-2026-34907?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-34907 have an EU (EUVD) identifier?: Yes. CVE-2026-34907 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33903.
When was CVE-2026-34907 published?: CVE-2026-34907 was published on 2026-06-02 and last updated on 2026-06-17.

References

Other CWE-79 (Cross-site Scripting (XSS)) vulnerabilities

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CVE-2023-45138 — Critical (CVSS 10.0): Change Request is an pplication allowing users to request changes on a wiki without publishing the changes directly.…
CVE-2022-4361 — Critical (CVSS 10.0): Keycloak, an open-source identity and access management solution, has a cross-site scripting (XSS) vulnerability in the…

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