Critical severity · published Sep 4, 2026
CVE-2026-52777
YesWiki: Authenticated PHP Object Injection in BazarImportAction via unserialize
9.4
CVSS
0.3%
EPSS
No
On KEV
Description
YesWiki is a wiki system written in PHP. Prior to version 4.6.6, there is an authenticated PHP object injection vulnerability in BazarImportAction via unserialize. This issue has been patched in version 4.6.6.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 20% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
YE
yeswiki · YesWiki
< 4.6.6 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-52777
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-52777
github.com
https://github.com/YesWiki/yeswiki/commit/8f70a8d6b8befa0e644d03c785701dbbc55b8fd0
github.com
https://github.com/YesWiki/yeswiki/releases/tag/v4.6.6
github.com
https://github.com/YesWiki/yeswiki/security/advisories/GHSA-9369-69wj-7m2f
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