How severe is CVE-2026-30869?

CVE-2026-30869 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 no user interaction. Impact on confidentiality is high, integrity none, and availability low.

Is CVE-2026-30869 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-30869?

CVE-2026-30869 affects B3log Siyuan. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-30869?

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-2026-30869 have an EU (EUVD) identifier?

Yes. CVE-2026-30869 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10414.

When was CVE-2026-30869 published?

CVE-2026-30869 was published on 2026-03-10 and last updated on 2026-06-17.

CVE-2026-30869

CVE-2026-30869 is a critical-severity vulnerability in B3log Siyuan 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-22.

Key facts

Severity: Critical (CVSS 3.x base score 9.3)
EPSS exploit prediction: 1% (59th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-10414
Weakness: CWE-22
Affected product: B3log Siyuan
Published: 2026-03-10
Last modified: 2026-06-17

Description

SiYuan is a personal knowledge management system. Prior to 3.5.10, a path traversal vulnerability in the /export endpoint allows an attacker to read arbitrary files from the server filesystem. By exploiting double‑encoded traversal sequences, an attacker can access sensitive files such as conf/conf.json, which contains secrets including the API token, cookie signing key, and workspace access authentication code. Leaking these secrets may enable administrative access to the SiYuan kernel API, and in certain deployment scenarios could potentially be chained into remote code execution (RCE). This vulnerability is fixed in 3.5.10.

Frequently asked questions

What is CVE-2026-30869?: SiYuan is a personal knowledge management system. Prior to 3.5.10, a path traversal vulnerability in the /export endpoint allows an attacker to read arbitrary files from the server filesystem. By exploiting double‑encoded traversal sequences, an attacker can access sensitive files such as conf/conf.json, which contains secrets including the API token, cookie signing key, and workspace access authentication code. Leaking these secrets may enable administrative access to the SiYuan kernel API, and in certain deployment scenarios could potentially be chained into remote code execution (RCE). This vulnerability is fixed in 3.5.10.
How severe is CVE-2026-30869?: CVE-2026-30869 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 no user interaction. Impact on confidentiality is high, integrity none, and availability low.
Is CVE-2026-30869 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-30869?: CVE-2026-30869 affects B3log Siyuan. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-30869?: 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-2026-30869 have an EU (EUVD) identifier?: Yes. CVE-2026-30869 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10414.
When was CVE-2026-30869 published?: CVE-2026-30869 was published on 2026-03-10 and last updated on 2026-06-17.

References

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-2h2p-mvfx-868w

Affected products (1)

cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:*

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