In Concrete CMS below version 9.4.8, a stored cross-site scripting (XSS) vulnerability exists in the "Legacy Form" block. An authenticated user with permissions to create or edit forms (e.g., a rogue administrator) can inject a persistent JavaScript payload into the options of a multiple-choice question (Checkbox List, Radio Buttons, or Select Box). This payload is then executed in the browser of any user who views the page containing the form. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 4.8 with vector CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks M3dium for reporting.
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History
Wed, 04 Mar 2026 21:45:00 +0000
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| CPEs | cpe:2.3:a:concretecms:concrete_cms:*:*:*:*:*:*:*:* | |
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cvssV3_1
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Wed, 04 Mar 2026 16:15:00 +0000
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ssvc
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Wed, 04 Mar 2026 15:00:00 +0000
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Concretecms
Concretecms concrete Cms |
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Concretecms
Concretecms concrete Cms |
Wed, 04 Mar 2026 03:00:00 +0000
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| Description | In Concrete CMS below version 9.4.8, a stored cross-site scripting (XSS) vulnerability exists in the "Legacy Form" block. An authenticated user with permissions to create or edit forms (e.g., a rogue administrator) can inject a persistent JavaScript payload into the options of a multiple-choice question (Checkbox List, Radio Buttons, or Select Box). This payload is then executed in the browser of any user who views the page containing the form. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 4.8 with vector CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks M3dium for reporting. | |
| Title | Concrete CMS below version 9.4.8 is vulnerable to a stored cross-site scripting (XSS) in the "Legacy Form" block. | |
| Weaknesses | CWE-79 | |
| References |
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| Metrics |
cvssV4_0
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Status: PUBLISHED
Assigner: ConcreteCMS
Published: 2026-03-04T02:12:51.092Z
Updated: 2026-03-04T15:42:07.836Z
Reserved: 2026-02-26T02:21:35.988Z
Link: CVE-2026-3241
Updated: 2026-03-04T15:42:04.105Z
Status : Analyzed
Published: 2026-03-04T03:16:05.107
Modified: 2026-03-04T21:32:10.597
Link: CVE-2026-3241
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