CVE-2026-87812

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.36% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 29.6% of scored records. A rank, not a probability.

NVD base score

7.4 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/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

NVD analysis status

Deferred. NVD last modified this record on 2026-09-10.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-09-09 11:21Z1 MO AGO

Last updated

2026-09-10 14:58Z1 MO AGO

Reserved

2026-09-09

Assigning CNA

VulnCheck

Record state

PUBLISHED

Severity

High (CVSS 7.4)

CNA CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Weaknesses

• CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')Base

Data version

5.2

Document digest

53ff927520bda36bf565fe85bd6672cf0dbdec69fabb9b45804b364a01812c95

• github.comGitHub Security Advisory (GHSA-rvcf-q4h8-w6c9)https://github.com/siyuan-note/siyuan/security/advisories/GHSA-rvcf-q4h8-w6c9vendor-advisory
• www.vulncheck.comVulnCheck Advisory: SiYuan before v3.8.2 Stored XSS via Bazaar iconURLhttps://www.vulncheck.com/advisories/siyuan-before-3.8.2-stored-xss-via-bazaar-iconurlthird-party-advisory