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Description

The Page Builder Gutenberg Blocks – CoBlocks plugin for WordPress is vulnerable to Stored Cross-Site Scripting via external iCal feed data in all versions up to, and including, 3.1.16 due to insufficient output escaping of event titles, descriptions, and locations fetched from external iCal feeds in the Events block rendering function. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

PUBLISHED Reserved 2026-03-25 | Published 2026-04-18 | Updated 2026-04-20 | Assigner Wordfence




MEDIUM: 6.4CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Problem types

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

Default status
unaffected

Any version
affected

Timeline

2026-04-17:Disclosed

Credits

Fernando Mecozzi finder

References

www.wordfence.com/...-aa61-4ee7-9cbf-9f51cb5ac700?source=cve

plugins.trac.wordpress.org/...nk/src/blocks/events/index.php

plugins.trac.wordpress.org/...16/src/blocks/events/index.php

plugins.trac.wordpress.org/...nk/src/blocks/events/index.php

plugins.trac.wordpress.org/...16/src/blocks/events/index.php

plugins.trac.wordpress.org/...nk/src/blocks/events/index.php

plugins.trac.wordpress.org/...16/src/blocks/events/index.php

plugins.trac.wordpress.org/...nk/src/blocks/events/index.php

plugins.trac.wordpress.org/...16/src/blocks/events/index.php

plugins.trac.wordpress.org/...nk/src/blocks/events/index.php

plugins.trac.wordpress.org/...16/src/blocks/events/index.php

plugins.trac.wordpress.org/...nk/src/blocks/events/index.php

plugins.trac.wordpress.org/...w_path=%2Fcoblocks/tags/3.1.17

cve.org (CVE-2026-4801)

nvd.nist.gov (CVE-2026-4801)

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