How severe is CVE-2026-25647?

CVE-2026-25647 has a CVSS 3.x base score of 4.6, 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-2026-25647 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-25647?

CVE-2026-25647 affects B3log Siyuan. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-25647?

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

Does CVE-2026-25647 have an EU (EUVD) identifier?

Yes. CVE-2026-25647 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5622.

When was CVE-2026-25647 published?

CVE-2026-25647 was published on 2026-02-06 and last updated on 2026-06-17.

CVE-2026-25647

CVE-2026-25647 is a medium-severity vulnerability in B3log Siyuan with a CVSS 3.x base score of 4.6. 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 4.6)
EPSS exploit prediction: 0% (10th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-5622
Weakness: CWE-79
Affected product: B3log Siyuan
Published: 2026-02-06
Last modified: 2026-06-17

Description

Lute is a structured Markdown engine supporting Go and JavaScript. Lute 1.7.6 and earlier (as used in SiYuan before) has a Stored Cross-Site Scripting (XSS) vulnerability in the Markdown rendering engine. An attacker can inject malicious JavaScript into a Markdown text/note. When another user clicks the rendered content, the script executes in the context of their session.

Frequently asked questions

What is CVE-2026-25647?: Lute is a structured Markdown engine supporting Go and JavaScript. Lute 1.7.6 and earlier (as used in SiYuan before) has a Stored Cross-Site Scripting (XSS) vulnerability in the Markdown rendering engine. An attacker can inject malicious JavaScript into a Markdown text/note. When another user clicks the rendered content, the script executes in the context of their session.
How severe is CVE-2026-25647?: CVE-2026-25647 has a CVSS 3.x base score of 4.6, 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-2026-25647 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-25647?: CVE-2026-25647 affects B3log Siyuan. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-25647?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-25647 have an EU (EUVD) identifier?: Yes. CVE-2026-25647 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5622.
When was CVE-2026-25647 published?: CVE-2026-25647 was published on 2026-02-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:b3log:siyuan:3.5.4:-:*:*:*:*:*:*

More vulnerabilities in B3log Siyuan

CVE-2026-32938 — Critical (CVSS 9.9): SiYuan is a personal knowledge management system. In versions 3.6.0 and below, the /api/lute/html2BlockDOM on the…
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