SiYuan before v3.8.4 does not HTML-escape stored flashcard block content before interpolating it into the card-manager list markup. Block content returned by /api/riff/getRiffCards is inserted into a card item template in app/src/card/viewCards.ts and assigned to listElement.innerHTML, so content such as becomes an executable event-handler attribute. Because the SiYuan desktop (Electron) main window is created with nodeIntegration enabled and contextIsolation disabled, an administrator who opens the card manager on a workspace containing attacker-supplied flashcard content (for example introduced through contribution or import) executes the attacker's script in a privileged renderer, which can lead to arbitrary code execution on the host. The affected endpoint remains behind authentication and administrator-role checks; this is an untrusted-content-to-privileged-renderer issue, not an authorization bypass.
CVE-2026-100641
“—” beside the score: it is equal to the CVSS score beside it.
Score 8.0 from GitHub Security Advisory (severity: HIGH) published 2026-09-26. A secondary CVSS source baseline 8.0; sources differ by 0.0.
Also known asEUVD-2026-87735 (ENISA EUVD) · GHSA-wvmc-29rv-83j2 (GitHub Security Advisories)Source: ENISA EUVD
- CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
A fix is referenced (a reference tagged "Patch", often a source commit), but no release containing it is confirmed — find the release that contains it; until it is applied, mitigate (WAF / firewall / segmentation).
- CVSS v3
- 8.0
- EG Score
- 8.0HIGHmedium confidence
- EG Risk
- 52EG Risk 52/100
EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.
How it’s computed (value × EchelonGraph’s weight)Severity80% × 45%Impact severity (EG Severity): CVSS 8.0 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation40% × 40%EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.Automatability0% × 15%CISA's SSVC Automatable value: no (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high. - EPSS PROB
- 0.7%
- EPSS %ILE
- 52nd
- KEV
- Not listed
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (8.0): severity, escalated by confirmed exploitation. This CVE's 8.0 is its impact severity (EG Severity), not escalated.
- EG Severity
- 8.0 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
- EG Likelihood
- 0.7% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-25). FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track* at medium mission impactTrack at low, Track* at medium and Attend at high mission impact.CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says. In the directive's words, “Fix on system upgrade” means that, “unless conditions change”, the vulnerability “should be remediated the next time the vulnerable asset receives a scheduled major upgrade or rebuild”: its timelines are “dynamic as facts change”, and a KEV listing shortens them.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.
A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high.
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.
No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says. In the directive's words, “Fix on system upgrade” means that, “unless conditions change”, the vulnerability “should be remediated the next time the vulnerable asset receives a scheduled major upgrade or rebuild”: its timelines are “dynamic as facts change”, and a KEV listing shortens them.
The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
Published
September 26, 2026
Last Modified
October 5, 2026
Advisory Details (6)
Auto-updated Sep 26, 2026SiYuan before v3.8.4 Stored XSS via Unescaped Flashcard Content | Advisories | VulnCheck
https://www.vulncheck.com/advisories/siyuan-before-3.8.4-stored-xss-via-unescaped-flashcard-contentcommit 8641553a1f07 (siyuan-note/siyuan)
Fix landed in siyuan-note/siyuan commit 8641553a1f07 — awaiting tagged release
https://github.com/siyuan-note/siyuan/commit/8641553a1f07374001902d3ce773285db1292b2dcommit 41b14025b4ac (siyuan-note/siyuan)
Fix landed in siyuan-note/siyuan commit 41b14025b4ac — awaiting tagged release
https://github.com/siyuan-note/siyuan/commit/41b14025b4ac4a8379d1200580344ca18ad152b7commit 48c354e7de13 (siyuan-note/siyuan)
Fix landed in siyuan-note/siyuan commit 48c354e7de13 — awaiting tagged release
https://github.com/siyuan-note/siyuan/commit/48c354e7de130aaada9d7120125bbc768344fd3bcommit 1ecb1c07de49 (siyuan-note/siyuan)
Fix landed in siyuan-note/siyuan commit 1ecb1c07de49 — awaiting tagged release
https://github.com/siyuan-note/siyuan/commit/1ecb1c07de497ff03b585536fe5579291754d96bUnescaped Flashcard Content Enables Code Execution in the Desktop Card Manager · Advisory · siyuan-note/siyuan · GitHub
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-2mmf-4xwm-55rmVendor Advisories for CVE-2026-100641(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 9× in last 7d / 70× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.
- 2026-11-01 16:33 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-31 16:31 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-10-26 15:32 UTCEG score recompute
- 2026-10-26 15:32 UTCGHSA enrichmentGHSA-wvmc-29rv-83j2 · GitHub severity HIGH · GitHub CVSS 8.0
- 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-10-25 15:58 UTCEG score recompute
- 2026-10-25 00:35 UTCEG score recompute
- 2026-10-25 00:35 UTCGHSA enrichmentGHSA-wvmc-29rv-83j2 · GitHub severity HIGH · GitHub CVSS 8.0
- 2026-10-24 16:31 UTCEPSS rescoreEPSS 0.5% · 44th percentile
- 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.5% · 44th percentile
- 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
- 2026-10-21 16:31 UTCEPSS rescoreEPSS 0.5% · 44th percentile
- 2026-10-20 16:31 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
- 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
- 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
- 2026-10-18 05:11 UTCEG score recompute
- 2026-10-17 20:14 UTCEG score recompute
- 2026-10-17 20:13 UTCGHSA enrichmentGHSA-wvmc-29rv-83j2 · GitHub severity HIGH · GitHub CVSS 8.0
- 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
- 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
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- 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
- 2026-10-14 16:31 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
- 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
- 2026-10-12 16:41 UTCEG score recompute
- 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
- 2026-10-11 23:13 UTCGHSA enrichmentGHSA-wvmc-29rv-83j2 · GitHub severity HIGH · GitHub CVSS 8.0
- 2026-10-11 20:16 UTCEG score recompute
- 2026-10-11 18:29 UTCEG score recompute
- 2026-10-11 15:02 UTCEG score recompute
- 2026-10-11 13:47 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
- 2026-10-11 10:46 UTCGHSA enrichmentGHSA-wvmc-29rv-83j2 · GitHub severity HIGH · GitHub CVSS 8.0
- 2026-10-10 22:16 UTCEG score recompute
- 2026-10-10 22:16 UTCGHSA enrichmentGHSA-wvmc-29rv-83j2 · GitHub severity HIGH · GitHub CVSS 8.0
- 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
- 2026-10-10 09:43 UTCGHSA enrichmentGHSA-wvmc-29rv-83j2 · GitHub severity HIGH · GitHub CVSS 8.0
- 2026-10-09 21:16 UTCEG score recompute
- 2026-10-09 21:16 UTCGHSA enrichmentGHSA-wvmc-29rv-83j2 · GitHub severity HIGH · GitHub CVSS 8.0
- 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
- 2026-10-09 08:50 UTCGHSA enrichmentGHSA-wvmc-29rv-83j2 · GitHub severity HIGH · GitHub CVSS 8.0
- 2026-10-08 20:06 UTCEG score recompute
- 2026-10-08 20:06 UTCGHSA enrichmentGHSA-wvmc-29rv-83j2 · GitHub severity HIGH · GitHub CVSS 8.0
- 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
- 2026-10-08 06:40 UTCEG score recompute
- 2026-10-08 06:40 UTCGHSA enrichmentGHSA-wvmc-29rv-83j2 · GitHub severity HIGH · GitHub CVSS 8.0
- 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
- 2026-10-07 18:14 UTCGHSA enrichmentGHSA-wvmc-29rv-83j2 · GitHub severity HIGH · GitHub CVSS 8.0
- 2026-10-07 05:48 UTCGHSA enrichmentGHSA-wvmc-29rv-83j2 · GitHub severity HIGH · GitHub CVSS 8.0
- 2026-10-06 17:21 UTCEG score recompute
- 2026-10-06 17:21 UTCGHSA enrichmentGHSA-wvmc-29rv-83j2 · GitHub severity HIGH · GitHub CVSS 8.0
- 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
- 2026-10-06 04:55 UTCEG score recompute
- 2026-10-06 04:55 UTCGHSA enrichmentGHSA-wvmc-29rv-83j2 · GitHub severity HIGH · GitHub CVSS 8.0
- 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
- 2026-10-05 16:28 UTCEG score recompute
- 2026-10-05 16:28 UTCGHSA enrichmentGHSA-wvmc-29rv-83j2 · GitHub severity HIGH · GitHub CVSS 8.0
- 2026-10-05 16:11 UTCEG score recompute
- 2026-10-05 16:11 UTCGHSA enrichmentGHSA-wvmc-29rv-83j2 · GitHub severity HIGH · GitHub CVSS 8.0
- 2026-10-05 11:15 UTCEG score recompute
- 2026-10-05 11:15 UTCGHSA enrichmentGHSA-wvmc-29rv-83j2 · GitHub severity HIGH · GitHub CVSS 8.0
- 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
- 2026-10-04 22:48 UTCGHSA enrichmentGHSA-wvmc-29rv-83j2 · GitHub severity HIGH · GitHub CVSS 8.0
- 2026-10-04 10:22 UTCGHSA enrichmentGHSA-wvmc-29rv-83j2 · GitHub severity HIGH · GitHub CVSS 8.0
- 2026-10-03 21:55 UTCEG score recompute
- 2026-10-03 21:55 UTCGHSA enrichmentGHSA-wvmc-29rv-83j2 · GitHub severity HIGH · GitHub CVSS 8.0
- 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
- 2026-10-03 09:19 UTCGHSA enrichmentGHSA-wvmc-29rv-83j2 · GitHub severity HIGH · GitHub CVSS 8.0
- 2026-10-02 20:51 UTCEG score recompute
- 2026-10-02 20:51 UTCGHSA enrichmentGHSA-wvmc-29rv-83j2 · GitHub severity HIGH · GitHub CVSS 8.0
- 2026-10-02 08:24 UTCGHSA enrichmentGHSA-wvmc-29rv-83j2 · GitHub severity HIGH · GitHub CVSS 8.0
- 2026-10-01 19:58 UTCEG score recompute
- 2026-10-01 19:58 UTCGHSA enrichmentGHSA-wvmc-29rv-83j2 · GitHub severity HIGH · GitHub CVSS 8.0
- 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
- 2026-10-01 07:32 UTCGHSA enrichmentGHSA-wvmc-29rv-83j2 · GitHub severity HIGH · GitHub CVSS 8.0
- 2026-09-30 19:06 UTCEG score recompute
- 2026-09-30 19:06 UTCGHSA enrichmentGHSA-wvmc-29rv-83j2 · GitHub severity HIGH · GitHub CVSS 8.0
- 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
- 2026-09-30 06:40 UTCGHSA enrichmentGHSA-wvmc-29rv-83j2 · GitHub severity HIGH · GitHub CVSS 8.0
- 2026-09-29 18:14 UTCEG score recompute
- 2026-09-29 18:14 UTCGHSA enrichmentGHSA-wvmc-29rv-83j2 · GitHub severity HIGH · GitHub CVSS 8.0
- 2026-09-29 15:20 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
- 2026-09-29 04:51 UTCEG score recompute
- 2026-09-29 04:51 UTCGHSA enrichmentGHSA-wvmc-29rv-83j2 · GitHub severity HIGH · GitHub CVSS 8.0
- 2026-09-28 16:25 UTCEG score recompute
- 2026-09-28 16:25 UTCGHSA enrichmentGHSA-wvmc-29rv-83j2 · GitHub severity HIGH · GitHub CVSS 8.0
- 2026-09-28 13:50 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
- 2026-09-28 03:58 UTCGHSA enrichmentGHSA-wvmc-29rv-83j2 · GitHub severity HIGH · GitHub CVSS 8.0
- 2026-09-27 15:32 UTCEG score recompute
- 2026-09-27 15:31 UTCGHSA enrichmentGHSA-wvmc-29rv-83j2 · GitHub severity HIGH · GitHub CVSS 8.0
- 2026-09-27 03:02 UTCEG score recompute
- 2026-09-27 03:01 UTCGHSA enrichmentGHSA-wvmc-29rv-83j2 · GitHub severity HIGH · GitHub CVSS 8.0
- 2026-09-26 14:35 UTCEG score recompute
- 2026-09-26 13:39 UTCEG score recomputeFirst assessed: 8.0 HIGH
- 2026-09-26 13:30 UTCMITRE cvelistV5first tracked
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Frequently asked(5)
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