{"id":"CVE-2026-73606","kind":"vulnerability","aliases":["CVE-2026-73606","GHSA-vg99-7gj7-2fr5","GO-2026-6635"],"related":[],"title":"SiYuan: The reference filter for getRefIDs checks visibility but not the password tier, disclosing that password-protected documents reference a given block in github.com/siyuan-note/siyuan/kernel","description":"SiYuan versions before v3.7.4 contain an information disclosure vulnerability in the /api/block/getRefIDs endpoint that fails to check password-protected document tiers. Unauthenticated readers can discover that password-protected documents reference specific blocks and obtain block identifiers without entering the document password.","summary":"SiYuan's /api/block/getRefIDs endpoint skips the password check on protected documents, so it reveals which password-protected documents reference a given block. An unauthenticated reader can learn block identifiers and that those documents exist without the document password.","severity":"medium","cvss":6.9,"epss":0.00325,"exploited":false,"exploited_at":null,"products":[{"name":"github.com/siyuan-note/siyuan/kernel","fixed":["0.0.0-20260812083335-251596fc0de2"],"affected":"< 0.0.0-20260812083335-251596fc0de2","ecosystem":"go"}],"ecosystems":["go"],"tags":["go","package","self-hosted","siyuan"],"not_affected_if":["default-config","managed-hosting"],"how_to_check":"Check the SiYuan version running on the server; versions before v3.7.4 (Go module pseudo-version before 0.0.0-20260812083335-251596fc0de2) are affected.","fix":"Upgrade SiYuan to v3.7.4 or later (module 0.0.0-20260812083335-251596fc0de2 or newer).","status":"open","published_at":"2026-08-13T12:17:25+00:00","first_seen_at":"2026-10-23T19:13:08+00:00","triaged_at":"2026-10-23T21:46:00+00:00","updated_at":"2026-10-23T21:46:00+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-10-23T21:46:00Z","model":"claude-haiku-5-5","output":{"fix":"Upgrade SiYuan to v3.7.4 or later (module 0.0.0-20260812083335-251596fc0de2 or newer).\nunknown","reach":"network","impact":"low","summary":"SiYuan's /api/block/getRefIDs endpoint skips the password check on protected documents, so it reveals which password-protected documents reference a given block. An unauthenticated reader can learn block identifiers and that those documents exist without the document password.","category":"package","who_cares":["siyuan","self-hosted","go"],"confidence":0.7,"needs_auth":"no","worst_case":"Unauthenticated attacker learns block IDs and existence of password-protected documents, not their content.","analyst_note":"","how_to_check":"Check the SiYuan version running on the server; versions before v3.7.4 (Go module pseudo-version before 0.0.0-20260812083335-251596fc0de2) are affected.\nunknown","needs_analyst":false,"not_affected_if":["managed-hosting","default-config"],"user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000491,"input_tokens":2984,"output_tokens":386,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':29A,37A,40A '-6635':38A '-73606':30A,41A '/api/block/getrefids':53B,101C '/siyuan-note/siyuan/kernel':27A,44A '2fr5':35A '7gj7':34A 'block':23A,73B,79B,123C,126C 'check':7A,58B,106C 'contain':94C 'cve':28A,39A 'disclos':14A 'disclosur':97C 'discov':115C 'document':19A,61B,69B,84B,88B,110C,120C,131C 'endpoint':54B,102C 'enter':129C 'exist':85B 'fail':104C 'filter':4A 'getrefid':6A 'ghsa':32A 'ghsa-vg99-7gj7-2fr5':31A 'github.com':26A,43A 'github.com/siyuan-note/siyuan/kernel':25A,42A 'given':22A,72B 'go':36A,45B 'host':49B 'identifi':80B,127C 'inform':96C 'learn':78B 'obtain':125C 'packag':46B 'password':12A,17A,57B,67B,89B,108C,118C,132C 'password-protect':16A,66B,107C,117C 'protect':18A,60B,68B,109C,119C 'reader':76B,113C 'refer':3A,20A,70B,121C 'reveal':64B 'self':48B 'self-host':47B 'siyuan':1A,50B,51B,90C 'skip':55B 'specif':122C 'tier':13A,111C 'unauthent':75B,112C 'v3.7.4':93C 'version':91C 'vg99':33A 'visibl':8A 'vulner':98C 'without':86B,128C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2026-08-13T12:17:25+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","cvss_by":"disclosure@vulncheck.com","poc_count":0,"sources":[{"source":"govuln","external_id":"GO-2026-6635","url":"https://pkg.go.dev/vuln/GO-2026-6635","severity":null,"published_at":"2026-10-07T14:09:59+00:00","modified_at":"2026-10-07T14:09:59+00:00","first_seen_at":"2026-10-23T19:13:08+00:00","fetched_at":"2026-10-23T19:13:08+00:00","note":null},{"source":"epss","external_id":"CVE-2026-73606","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-73606","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-23T19:13:43+00:00","fetched_at":"2026-10-23T19:13:43+00:00","note":null},{"source":"nvd","external_id":"CVE-2026-73606","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-73606","severity":null,"published_at":"2026-08-13T12:17:25+00:00","modified_at":"2026-10-23T18:10:00+00:00","first_seen_at":"2026-10-23T19:35:23+00:00","fetched_at":"2026-10-23T19:35:23+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}