CVE-2026-74800Disclosure

LOWCVSS 9.4 · CRITICAL

Signal is active with 1 mentions in latest observed window

Immediate actions

Patch affected systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

SiYuan before v3.7.4 fails to set Content-Disposition and X-Content-Type-Options headers when serving arbitrary file assets, allowing stored cross-site scripting attacks. Authenticated attackers can upload HTML files as assets and execute scripts with full kernel API access when the workspace owner opens the asset link.

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0.5/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-79

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Threat summary

Patch or workaround signal is available
1 mentions across 1 observed day

What's happening

Patch or workaround mentioned in 1 signal
Technical details provided in 1 signal
Disclosure: 1 classified signal
1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Disclosure

1100.0%

Referenced assets1 URL

By indicator

https://www.valtersit.com/cve/CVE-2026-74800

Full discourse1 post

Hugo | DevOps | Cybersecurity 🇱🇻@HugoValters46d
Disclosure
CVE-2026-74800 - Stored XSS in SiYuan. Missing headers allow script execution with full kernel API access. CVSS 9.0. Unpatched. Update or restrict file uploads now. #CVE #SiYuan #infosec https://www.valtersit.com/cve/CVE-2026-74800 #CVE #infosec #SysAdmin #cybersecurity #Linux #devsecops #devops #developer #sysadmin #100daysofcode #git #github #gitlab #redteam #blueteam #ethicalhacker #ethicalhacking #cybersecurityawareness #cybersecurity #cybersecuritynews #cybersecuritytips #python #hacker #linux #kali #ubuntu #debian #ukraine #spain #ireland #unitedkingdom #canada #finland #estonia #lithuania #ireland #hungary #denmark #norway #malta #mexico
Post summary
The tweet discloses CVE-2026-74800, a high‑severity Stored XSS flaw in SiYuan that permits kernel API execution via missing headers, and urges users to update or restrict file uploads.
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