Secuno
ENNL
Book demo

CVE-2026-77086

SiYuan path traversal

9.1 CRITICALEPSS 1.03%
  1. Published21 Aug 2026

Description

SiYuan before v3.7.4 fails to validate the packageName parameter in Bazaar install and uninstall endpoints, allowing authenticated administrators to perform path traversal via directory traversal sequences. Attackers with admin access can write arbitrary files to any location via install operations or recursively delete directories via uninstall operations by supplying crafted packageName values.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredHigh
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-599768.1
ConvertX is a self-hosted file conversion service. Prior to 0.18.0, the ImageMagick…
CVE-2026-859538.5
Progress MarkLogic Server 12.x releases before 12.1.0 and 11.x releases before 11.3.7…
CVE-2026-783558.7
A path traversal vulnerability in the OTRS SendSupportBundle functionality allows an…
CVE-2026-876908.8
The Metasploit Framework post module post/apple_ios/gather/ios_image_gather is affected…
CVE-2026-1089028.1
pH7Builder (pH7 Social Dating CMS) before 18.5.0 contains a path traversal…
CVE-2026-1058929.8
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')…

Frequently asked

Is CVE-2026-77086 being actively exploited?

CVE-2026-77086 is not in the CISA KEV catalog. Its EPSS exploit probability is 1.03%.

How severe is CVE-2026-77086?

CVE-2026-77086 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 1.03% probability of exploitation.

How do I fix CVE-2026-77086?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-77086 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.