6.6

CVE-2026-62204: SiYuan before v3.7.4 Plugin Overwrite via Bazaar Install

Deferred
Published 22-08-2026Last modified 26-08-2026

Vulnerability summary

CVE-2026-62204 is a medium (CVSS 6.6) vulnerability in siyuan-note siyuan. EPSS estimates a 0.09% chance of exploitation in the next 30 days, higher than 0.5% of scored vulnerabilities.

Overall risk
26/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.6/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.09%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 22-08-2026
    PublishedVulnerability first disclosed.
  2. 26-08-2026
    Last modifiedVulnerability information updated.

Description

SiYuan versions before v3.7.4 fail to validate that packageName matches the downloaded package content in bazaar install endpoints. Attackers with same-origin access can overwrite existing trusted plugins by supplying mismatched packageName and repoURL parameters, achieving persistence across application restarts.

CVSS metrics

4 scores · 2 sources · 2 versions

EPSS trend

Probability

0.09%

Chance of exploitation in the next 30 days

Percentile

1%

Versus all other CVEs

30-day change

Increase +0.03 pp

From 0.07% on 22-09-2026

22-09-202622-10-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Siyuan-note1 product

1 vendor · 1 product

References

2 links