CVE Explorer

CVE-2026-8981

The Custom Block Builder WordPress plugin before 4.3.0 does not consistently check the unfiltered_html capability across all paths that write to its block template code fields, allowing administrators on multisite installations (or single-site installs with DISALLOW_UNFILTERED_HTML defined) to inject arbitrary JavaScript that executes for any visitor of pages embedding the affected block.

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:b6e079ab12548d19eab7b415ee84a9a129812ec090ab5f1695c48a346a147b77

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-79","description":"CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:15279ee7ffb12959301757dc9a09833c12aaf2c0c28e96ab70071cd8a4ae19ad · sha256:1a49db4002d1de6f… · /containers/adp/0/problemTypes/0/descriptions/0

{"description":"CWE-79 Cross-Site Scripting (XSS)","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:15279ee7ffb12959301757dc9a09833c12aaf2c0c28e96ab70071cd8a4ae19ad · sha256:1a49db4002d1de6f… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion

{"defaultStatus":"unaffected","product":"Custom Block Builder","vendor":"Unknown","versions":[{"lessThan":"4.3.0","status":"affected","version":"0","versionType":"semver"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:15279ee7ffb12959301757dc9a09833c12aaf2c0c28e96ab70071cd8a4ae19ad · sha256:1a49db4002d1de6f… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":3.5,"baseSeverity":"LOW","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"HIGH","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:15279ee7ffb12959301757dc9a09833c12aaf2c0c28e96ab70071cd8a4ae19ad · sha256:1a49db4002d1de6f… · /containers/adp/0/metrics/0/cvssV3_1

CWE assertions

2 source assertions

{"cweId":"CWE-79","description":"CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:15279ee7ffb12959301757dc9a09833c12aaf2c0c28e96ab70071cd8a4ae19ad · sha256:1a49db4002d1de6f… · /containers/adp/0/problemTypes/0/descriptions/0

{"description":"CWE-79 Cross-Site Scripting (XSS)","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:15279ee7ffb12959301757dc9a09833c12aaf2c0c28e96ab70071cd8a4ae19ad · sha256:1a49db4002d1de6f… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion

{"tags":["exploit","vdb-entry","technical-description"],"url":"https://wpscan.com/vulnerability/9815b0e6-e411-4a5c-9c63-30bad21da698/"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:15279ee7ffb12959301757dc9a09833c12aaf2c0c28e96ab70071cd8a4ae19ad · sha256:1a49db4002d1de6f… · /containers/cna/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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