CVE Explorer

CVE-2026-25539

SiYuan is a personal knowledge management system. Prior to version 3.5.5, the /api/file/copyFile endpoint does not validate the dest parameter, allowing authenticated users to write files to arbitrary locations on the filesystem. This can lead to Remote Code Execution (RCE) by writing to sensitive locations such as cron jobs, SSH authorized_keys, or shell configuration files. This issue has been patched in version 3.5.5.

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:32a3a63dc0ecc06cf56b742ec41decccc01cbeebddf2e4c69a1505c1a6d03957

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"siyuan","vendor":"siyuan-note","versions":[{"status":"affected","version":"< 3.5.5"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:1c4c4ebec2a85f3f0fc505a08214c0dd2f624152af29708e03b7cae2c53ee968 · sha256:75161eca397478e0… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"HIGH","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:1c4c4ebec2a85f3f0fc505a08214c0dd2f624152af29708e03b7cae2c53ee968 · sha256:75161eca397478e0… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion

{"cweId":"CWE-22","description":"CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:1c4c4ebec2a85f3f0fc505a08214c0dd2f624152af29708e03b7cae2c53ee968 · sha256:75161eca397478e0… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions

{"name":"https://github.com/siyuan-note/siyuan/commit/d7f790755edf8c78d2b4176171e5a0cdcd720feb","tags":["x_refsource_MISC"],"url":"https://github.com/siyuan-note/siyuan/commit/d7f790755edf8c78d2b4176171e5a0cdcd720feb"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:1c4c4ebec2a85f3f0fc505a08214c0dd2f624152af29708e03b7cae2c53ee968 · sha256:75161eca397478e0… · /containers/cna/references/1

{"tags":["exploit"],"url":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-c4jr-5q7w-f6r9"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:1c4c4ebec2a85f3f0fc505a08214c0dd2f624152af29708e03b7cae2c53ee968 · sha256:75161eca397478e0… · /containers/adp/0/references/0

{"name":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-c4jr-5q7w-f6r9","tags":["x_refsource_CONFIRM"],"url":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-c4jr-5q7w-f6r9"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:1c4c4ebec2a85f3f0fc505a08214c0dd2f624152af29708e03b7cae2c53ee968 · sha256:75161eca397478e0… · /containers/cna/references/0

Attribution and limitations

CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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