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CVE-2026-13253

The Ultimate Post plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'moreResultsText' block attribute of the ultimate-post/advanced-search block in versions up to and including 5.0.31. This is due to insufficient input sanitization and output escaping in the Advanced_Search::content() render callback: the attribute value is filtered with wp_kses(), which strips disallowed HTML tags but does NOT escape HTML special characters such as double quotes in plain text, and the re
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:15c3993a4419c946891321225057880831f727e17cf3bc08bd0434616a10fe39
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","product":"Post Grid Gutenberg Blocks – PostX","vendor":"wpxpo","versions":[{"lessThanOrEqual":"5.0.31","status":"affected","version":"0","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:48bee2e765015876a3a1a229bfdb285b399d92c3cc5337e52fca04733525478a · sha256:44dd8b7f35e4062e… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"baseScore":6.4,"baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:48bee2e765015876a3a1a229bfdb285b399d92c3cc5337e52fca04733525478a · sha256:44dd8b7f35e4062e… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"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:v2:48bee2e765015876a3a1a229bfdb285b399d92c3cc5337e52fca04733525478a · sha256:44dd8b7f35e4062e… · /containers/cna/problemTypes/0/descriptions/0

Source references

8 source assertions
{"url":"https://plugins.trac.wordpress.org/browser/ultimate-post/tags/5.0.27/blocks/Advanced_Search.php#L108"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:48bee2e765015876a3a1a229bfdb285b399d92c3cc5337e52fca04733525478a · sha256:44dd8b7f35e4062e… · /containers/cna/references/5
{"url":"https://plugins.trac.wordpress.org/browser/ultimate-post/tags/5.0.27/blocks/Advanced_Search.php#L116"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:48bee2e765015876a3a1a229bfdb285b399d92c3cc5337e52fca04733525478a · sha256:44dd8b7f35e4062e… · /containers/cna/references/1
{"url":"https://plugins.trac.wordpress.org/browser/ultimate-post/tags/5.0.27/classes/Blocks.php#L231"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:48bee2e765015876a3a1a229bfdb285b399d92c3cc5337e52fca04733525478a · sha256:44dd8b7f35e4062e… · /containers/cna/references/6
{"url":"https://plugins.trac.wordpress.org/browser/ultimate-post/tags/5.0.28/blocks/Advanced_Search.php#L108"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:48bee2e765015876a3a1a229bfdb285b399d92c3cc5337e52fca04733525478a · sha256:44dd8b7f35e4062e… · /containers/cna/references/3
{"url":"https://plugins.trac.wordpress.org/browser/ultimate-post/tags/5.0.28/blocks/Advanced_Search.php#L116"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:48bee2e765015876a3a1a229bfdb285b399d92c3cc5337e52fca04733525478a · sha256:44dd8b7f35e4062e… · /containers/cna/references/2
{"url":"https://plugins.trac.wordpress.org/browser/ultimate-post/tags/5.0.28/classes/Blocks.php#L231"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:48bee2e765015876a3a1a229bfdb285b399d92c3cc5337e52fca04733525478a · sha256:44dd8b7f35e4062e… · /containers/cna/references/4
{"url":"https://plugins.trac.wordpress.org/changeset?reponame=&old=3598669%40ultimate-post&new=3598669%40ultimate-post"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:48bee2e765015876a3a1a229bfdb285b399d92c3cc5337e52fca04733525478a · sha256:44dd8b7f35e4062e… · /containers/cna/references/7
{"url":"https://www.wordfence.com/threat-intel/vulnerabilities/id/070ccd70-22c3-47f1-9dce-a884bff9ea76?source=cve"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:48bee2e765015876a3a1a229bfdb285b399d92c3cc5337e52fca04733525478a · sha256:44dd8b7f35e4062e… · /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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