SiYuan: Unauthenticated SQLite Data Exfiltration via Template Injection in /api/icon/getDynamicIcon

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

SiYuan is an open-source personal knowledge management system. Prior to 3.7.0, the /api/icon/getDynamicIcon endpoint is explicitly excluded from authentication in SiYuan's kernel router (router.go, "不需要鉴权" -- no auth needed). When called with type=8 and a valid block id parameter, this endpoint invokes RenderDynamicIconContentTemplate, which executes a Go template that includes the querySQL and queryBlocks functions. These functions run arbitrary SELECT statements against the SiYuan SQLite database. An unauthenticated network-adjacent attacker who knows a valid block ID can exfiltrate all user note content, tags, asset references, and block attributes from the database. This vulnerability is fixed in 3.7.0.

Source published

24 Jun 2026 21:15:14 UTC

Source modified

25 Jun 2026 13:21:27 UTC

Observed here

23 Oct 2026 15:48:27 UTC

Source terms

CVE Program Terms of Use

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CVSS 3.1 · 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

SiYuan is an open-source personal knowledge management system. Prior to 3.7.0, the /api/icon/getDynamicIcon endpoint is explicitly excluded from authentication in SiYuan's kernel router (router.go, "不需要鉴权" -- no auth needed). When called with type=8 and a valid block id parameter, this endpoint invokes RenderDynamicIconContentTemplate, which executes a Go template that includes the querySQL and queryBlocks functions. These functions run arbitrary SELECT statements against the SiYuan SQLite database. An unauthenticated network-adjacent attacker who knows a valid block ID can exfiltrate all user note content, tags, asset references, and block attributes from the database. This vulnerability is fixed in 3.7.0.

Source published

Jun 24, 2026, 9:15:14 PM (timezone not stated)

Source modified

Jun 25, 2026, 1:21:27 PM (timezone not stated)

Observed here

7 Nov 2026 12:28:18 UTC

Source terms

ENISA EUVD · source terms and attribution apply

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: euvd · ENISA EUVD · source terms and attribution apply. Source text is retained; field grouping and change labels are provided by ChangeIntel.

EUVD CVSS 3.1 · 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

SiYuan is an open-source personal knowledge management system. Prior to 3.7.0, the /api/icon/getDynamicIcon endpoint is explicitly excluded from authentication in SiYuan's kernel router (router.go, "不需要鉴权" -- no auth needed). When called with type=8 and a valid block id parameter, this endpoint invokes RenderDynamicIconContentTemplate, which executes a Go template that includes the querySQL and queryBlocks functions. These functions run arbitrary SELECT statements against the SiYuan SQLite database. An unauthenticated network-adjacent attacker who knows a valid block ID can exfiltrate all user note content, tags, asset references, and block attributes from the database. This vulnerability is fixed in 3.7.0.

Source published

24 Jun 2026 22:16:48 UTC

Source modified

25 Oct 2026 23:10:00 UTC

Observed here

27 Oct 2026 14:13:29 UTC

Source terms

NIST NVD usage terms; underlying source attribution retained

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: nvd · NIST NVD usage terms; underlying source attribution retained. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 3.1 · [email protected] · Secondary · 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

### Summary The `/api/icon/getDynamicIcon` endpoint is explicitly excluded from authentication in SiYuan's kernel router (`router.go`, "不需要鉴权" -- no auth needed). When called with `type=8` and a valid block `id` parameter, this endpoint invokes `RenderDynamicIconContentTemplate`, which executes a Go template that includes the `querySQL` and `queryBlocks` functions. These functions run arbitrary SELECT statements against the SiYuan SQLite database. An unauthenticated network-adjacent attacker who knows a valid block ID can exfiltrate all user note content, tags, asset references, and block attributes from the database. ### Details **Root cause -- kernel/api/router.go, line 37:** ```go // 不需要鉴权 ginServer.Handle("GET", "/api/icon/getDynamicIcon", getDynamicIcon) ``` **Attack chain:** 1. `getDynamicIcon` (kernel/api/icon.go) checks `type=8` and calls `model.RenderDynamicIconContentTemplate(content, id)` when `content` contains `.action{`. 2. `RenderDynamicIconContentTemplate` (kernel/model/template.go:264) parses `content` as a Go template. The template function map includes `querySQL` and `queryBlocks` registered via `sql.SQLTemplateFuncs`. 3. `querySQL` calls `Query(stmt, 1024)` (kernel/sql/block_query.go) which executes the SQL statement against the SQLite database containing all user notes. 4. The SQL result is rendered into the SVG response body and returned to the unauthenticated caller. **Constraint:** The block `id` parameter must be a valid block ID that exists in the database. Block IDs are 22-character strings in the format `YYYYMMDDHHMMSS-XXXXXXX` (timestamp + 7 alphanumeric chars). Valid IDs are embedded in shared document URLs and can be leaked through any other authenticated endpoint, referrer headers, or browser history. **Tested on SiYuan v3.6.5 (Docker, network-serving mode, access auth code enabled):** ``` GET /api/icon/getDynamicIcon?type=8&content=.action{querySQL+"SELECT+id,content+FROM+blocks+LIMIT+5"}&id=<KNOWN_BLOCK_ID> Host: siyuan.example.com (No Authorization header) ``` Response (SVG with exfiltrated data embedded): ```xml <text ...>[map[id:20260524010447-jc9ypd4 content:test] map[id:20260524011002-ttaa7lu content:My password is SuperSecret123!]]</text> ``` The `querySQL` template function can query any table: `blocks` (all note content and metadata), `spans` (tags), `assets` (asset references), `attributes` (block attributes), and `refs` (backlinks). ### PoC ```bash TARGET="http://siyuan.example.com:6806" BLOCK_ID="KNOWN_BLOCK_ID_HERE" # From a shared link or other source # List all database tables curl -s "${TARGET}/api/icon/getDynamicIcon?type=8&content=.action%7BquerySQL+%22SELECT+name+FROM+sqlite_master+WHERE+type%3D%27table%27%22%7D&id=${BLOCK_ID}" # Dump all note content curl -s "${TARGET}/api/icon/getDynamicIcon?type=8&content=.action%7BquerySQL+%22SELECT+id%2Ctype%2Ccontent+FROM+blocks+LIMIT+100%22%7D&id=${BLOCK_ID}" ``` **PoC script:** `/home/mrrobot/GoogleDrive/vuln-research/siyuan/scripts/poc_getDynamicIcon_sqli.sh` ### Impact Any network-reachable SiYuan instance (Docker deployments default to `0.0.0.0:6806`) is vulnerable to complete note content exfiltration without authentication, provided the attacker can obtain one valid block ID. Block IDs are leaked in shared document URLs, embedded images referencing block IDs, and browser history. In a networked deployment scenario (e.g., a self-hosted SiYuan accessible from the internet), all personal notes, tags, and metadata are exposed to unauthenticated attackers. This vulnerability is distinct from previously reported SQL injection issues (GHSA-j7wh-x834-p3r7) which targeted the search API. The `getDynamicIcon` endpoint was never intended to execute SQL queries but gained this capability through the `querySQL` template function registered for the icon content template renderer.

Source published

10 Jul 2026 19:26:00 UTC

Source modified

21 Jul 2026 19:18:51 UTC

Observed here

24 Oct 2026 13:19:41 UTC

Source terms

GitHub Advisory Database · CC-BY-4.0

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS_V3 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Publisher rating · MODERATE

SiYuan: Unauthenticated SQLite Data Exfiltration via Template Injection in /api/icon/getDynamicIcon in github.com/siyuan-note/siyuan/kernel

Source published

17 Jul 2026 19:42:05 UTC

Source modified

21 Jul 2026 19:15:34 UTC

Observed here

24 Oct 2026 13:19:41 UTC

Source terms

OSV · upstream source license applies

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · OSV · upstream source license applies. Source text is retained; field grouping and change labels are provided by ChangeIntel.