How severe is CVE-2026-21430?

CVE-2026-21430 has a CVSS 3.x base score of 9.3, rated critical 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-2026-21430 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-21430?

CVE-2026-21430 affects Emlog. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-21430?

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

Does CVE-2026-21430 have an EU (EUVD) identifier?

Yes. CVE-2026-21430 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-0757.

When was CVE-2026-21430 published?

CVE-2026-21430 was published on 2026-01-02 and last updated on 2026-06-17.

CVE-2026-21430

CVE-2026-21430 is a critical-severity vulnerability in Emlog with a CVSS 3.x base score of 9.3. 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: Critical (CVSS 3.x base score 9.3)
CVSS v4: 7.0
EPSS exploit prediction: 0% (5th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-0757
Weakness: CWE-79
Affected product: Emlog
Published: 2026-01-02
Last modified: 2026-06-17

Description

Emlog is an open source website building system. In version 2.5.23, article creation functionality is vulnerable to cross-site request forgery (CSRF). This can lead to a user being forced to post an article with arbitrary, attacker-controlled content. This, when combined with stored cross-site scripting, leads to account takeover. As of time of publication, no known patched versions are available.

Frequently asked questions

What is CVE-2026-21430?: Emlog is an open source website building system. In version 2.5.23, article creation functionality is vulnerable to cross-site request forgery (CSRF). This can lead to a user being forced to post an article with arbitrary, attacker-controlled content. This, when combined with stored cross-site scripting, leads to account takeover. As of time of publication, no known patched versions are available.
How severe is CVE-2026-21430?: CVE-2026-21430 has a CVSS 3.x base score of 9.3, rated critical 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-2026-21430 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-21430?: CVE-2026-21430 affects Emlog. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-21430?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-21430 have an EU (EUVD) identifier?: Yes. CVE-2026-21430 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-0757.
When was CVE-2026-21430 published?: CVE-2026-21430 was published on 2026-01-02 and last updated on 2026-06-17.

References

https://github.com/emlog/emlog/security/advisories/GHSA-2g2w-vmg7-pq4q

Affected products (1)

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

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