How severe is CVE-2026-21431?

CVE-2026-21431 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-21431 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-21431?

CVE-2026-21431 affects Emlog. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-21431?

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

Does CVE-2026-21431 have an EU (EUVD) identifier?

Yes. CVE-2026-21431 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-0756.

When was CVE-2026-21431 published?

CVE-2026-21431 was published on 2026-01-02 and last updated on 2026-06-17.

CVE-2026-21431

CVE-2026-21431 is a medium-severity vulnerability in Emlog with a CVSS 3.x base score of 5.4. 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 3.x base score 5.4)
CVSS v4: 2.0
EPSS exploit prediction: 0% (6th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-0756
Weakness: CWE-79
Affected product: Emlog
Published: 2026-01-02
Last modified: 2026-06-17

Description

Emlog is an open source website building system. Version 2.5.23 has a stored cross-site scripting vulnerability in the `Resource media library ` function while publishing an article. As of time of publication, no known patched versions are available.

Frequently asked questions

What is CVE-2026-21431?: Emlog is an open source website building system. Version 2.5.23 has a stored cross-site scripting vulnerability in the `Resource media library ` function while publishing an article. As of time of publication, no known patched versions are available.
How severe is CVE-2026-21431?: CVE-2026-21431 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-21431 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-21431?: CVE-2026-21431 affects Emlog. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-21431?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-21431 have an EU (EUVD) identifier?: Yes. CVE-2026-21431 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-0756.
When was CVE-2026-21431 published?: CVE-2026-21431 was published on 2026-01-02 and last updated on 2026-06-17.

References

https://github.com/emlog/emlog/security/advisories/GHSA-9vc2-crhr-248x

Affected products (1)

cpe:2.3:a:emlog:emlog:2.5.23:*:*:*:pro:*:*:*

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