CVE-2026-52778

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Source
https://cve.org/CVERecord?id=CVE-2026-52778
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52778.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-52778
Aliases
Published
2026-06-08T18:24:21Z
Modified
2026-10-21T02:58:27Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
YesWiki has Unsafe eval() in Formula Calculator - Remote Code Execution (RCE) & Denial of Service (DoS)
Details

YesWiki is a wiki system written in PHP. Prior to version 4.6.6, an unsafe execution vulnerability exists in the Bazar form field calculator (CalcField.php) of YesWiki. The application attempts to sanitize user-defined mathematical formulas using a complex recursive regular expression before passing them to the PHP eval() function. This implementation is inherently flawed: it is vulnerable to Regular Expression Denial of Service (ReDoS / Stack Overflow) which can crash the server, and it creates a high-risk architecture where any logic bypass directly results in arbitrary PHP code execution. Version 4.6.6 patches the issue.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-1333",
        "CWE-94"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52778.json"
}
References

Affected packages

Git / github.com/yeswiki/yeswiki

Affected ranges

Type
GIT
Repo
https://github.com/yeswiki/yeswiki
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
fa81922f4103630911cbea98ead3c4b7bc786e19
Fixed
dd2bd8fb099de0d21504bda8a810693b3fcb8e52
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "4.6.6"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "fixed":  "dd2bd8fb099de0d21504bda8a810693b3fcb8e52"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "v4.6.6",
            "range":  [
                {
                    "fixed":  "fa81922f4103630911cbea98ead3c4b7bc786e19"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

Affected versions

v4.*
v4.1.0
v4.1.5
v4.2.0
v4.2.1
v4.2.2
v4.3.0
v4.3.1
v4.4.0
v4.4.1
v4.4.2
v4.4.3
v4.5.1
v4.5.2
v4.5.3
v4.5.4
v4.5.5
v4.6.0
v4.6.2
v4.6.3
v4.6.4
v4.6.5

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52778.json"