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CVE-2026-52778

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
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:2261bdc78fff8ee72520d8f9e7e68aad34b2f4cdaa708e326d3ec768d285a609
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-94","description":"CWE-94: Improper Control of Generation of Code ('Code Injection')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:f1d85e11584677807841871967bf79ed2fa563a3a4418dec5ad670b8e77e085f · sha256:f634b43fd8a4ef58… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-1333","description":"CWE-1333: Inefficient Regular Expression Complexity","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:f1d85e11584677807841871967bf79ed2fa563a3a4418dec5ad670b8e77e085f · sha256:f634b43fd8a4ef58… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"yeswiki","vendor":"YesWiki","versions":[{"status":"affected","version":"< 4.6.6"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f1d85e11584677807841871967bf79ed2fa563a3a4418dec5ad670b8e77e085f · sha256:f634b43fd8a4ef58… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.8,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:f1d85e11584677807841871967bf79ed2fa563a3a4418dec5ad670b8e77e085f · sha256:f634b43fd8a4ef58… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-94","description":"CWE-94: Improper Control of Generation of Code ('Code Injection')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:f1d85e11584677807841871967bf79ed2fa563a3a4418dec5ad670b8e77e085f · sha256:f634b43fd8a4ef58… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-1333","description":"CWE-1333: Inefficient Regular Expression Complexity","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:f1d85e11584677807841871967bf79ed2fa563a3a4418dec5ad670b8e77e085f · sha256:f634b43fd8a4ef58… · /containers/cna/problemTypes/1/descriptions/0

Source references

4 source assertions
{"name":"https://github.com/YesWiki/yeswiki/commit/dd2bd8fb099de0d21504bda8a810693b3fcb8e52","tags":["x_refsource_MISC"],"url":"https://github.com/YesWiki/yeswiki/commit/dd2bd8fb099de0d21504bda8a810693b3fcb8e52"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f1d85e11584677807841871967bf79ed2fa563a3a4418dec5ad670b8e77e085f · sha256:f634b43fd8a4ef58… · /containers/cna/references/1
{"name":"https://github.com/YesWiki/yeswiki/releases/tag/v4.6.6","tags":["x_refsource_MISC"],"url":"https://github.com/YesWiki/yeswiki/releases/tag/v4.6.6"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f1d85e11584677807841871967bf79ed2fa563a3a4418dec5ad670b8e77e085f · sha256:f634b43fd8a4ef58… · /containers/cna/references/2
{"name":"https://github.com/YesWiki/yeswiki/security/advisories/GHSA-px5m-h76g-p7p8","tags":["x_refsource_CONFIRM"],"url":"https://github.com/YesWiki/yeswiki/security/advisories/GHSA-px5m-h76g-p7p8"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f1d85e11584677807841871967bf79ed2fa563a3a4418dec5ad670b8e77e085f · sha256:f634b43fd8a4ef58… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/YesWiki/yeswiki/security/advisories/GHSA-px5m-h76g-p7p8"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f1d85e11584677807841871967bf79ed2fa563a3a4418dec5ad670b8e77e085f · sha256:f634b43fd8a4ef58… · /containers/adp/0/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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