VulnerabilityAnalyzed

CVE-2026-34598

Prior to version 4.6.0, a stored and blind XSS vulnerability exists in the form title field.

HIGH 7.1EPSS 0.21%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.21%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

YesWiki is a wiki system written in PHP. Prior to version 4.6.0, a stored and blind XSS vulnerability exists in the form title field. A malicious attacker can inject JavaScript without any authentication via a form title that is saved in the backend database. When any user visits that injected page, the JavaScript payload gets executed. This issue has been patched in version 4.6.0.

CVSS 4.0: 7.1 HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/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/M
EPSS: 0.21% probability · 12th percentile
CISA KEV: Not listed
Weakness: CWE-79, CWE-87
Affected: yeswiki/yeswiki
Source: security-advisories@github.com

References

https://github.com/YesWiki/yeswiki/releases/tag/v4.6.0Product, Release Notes
https://github.com/YesWiki/yeswiki/security/advisories/GHSA-37fq-47qj-6j5jExploit, Vendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.