Secuno
ENNL
Book demo

CVE-2026-30869

B3log Siyuan remote code execution

9.3 CRITICALPublic exploitEPSS 1.17%
  1. Published10 Mar 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityNone
AvailabilityLow
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:L

Affected products

B3log Siyuan< 3.5.10

Remediation

Fixed in
B3log Siyuan≥ 3.5.10

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-905309.3
ColdFusion RDS is affected by an Improper Limitation of a Pathname to a Restricted…
CVE-2026-631628.8
Omnispace Agora Project before 26.10.0 contains a path traversal vulnerability that…
CVE-2026-1022389.6
Improper limitation of a pathname to a restricted directory ('path traversal') in…
CVE-2026-699438.8
Improper limitation of a pathname to a restricted directory ('path traversal') in…
CVE-2026-1057278.8
Improper limitation of a pathname to a restricted directory ('path traversal') in…
CVE-2026-1022268.8
Improper limitation of a pathname to a restricted directory ('path traversal') in…

Frequently asked

Is CVE-2026-30869 being actively exploited?

CVE-2026-30869 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 1.17%.

How severe is CVE-2026-30869?

CVE-2026-30869 has a CVSS 3.1 base score of 9.3, rated critical. EPSS estimates a 1.17% probability of exploitation.

Which products are affected by CVE-2026-30869?

Affected products include B3log Siyuan.

How do I fix CVE-2026-30869?

Upgrade affected software to a fixed version, for example B3log Siyuan 3.5.10 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-30869 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.