CVE-2021-26539
Last modified
CVE-2021-26539 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. Apostrophe Technologies sanitize-html before 2.3.1 does not properly handle internationalized domain name (IDN) which could allow an attacker to bypass hostname whitelist validation set by the "allowedIframeHostnames" option.. EPSS estimates a 1.95% chance of exploitation in the next 30 days.
Description
Apostrophe Technologies sanitize-html before 2.3.1 does not properly handle internationalized domain name (IDN) which could allow an attacker to bypass hostname whitelist validation set by the "allowedIframeHostnames" option.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Apostrophecms | Sanitize-Html | < 2.3.1 |
References
- https://advisory.checkmarx.net/advisory/CX-2021-4308Exploit, Third Party Advisory
- https://github.com/apostrophecms/sanitize-html/blob/main/CHANGELOG.md#231-2021-01-22Release Notes, Third Party Advisory
- https://github.com/apostrophecms/sanitize-html/pull/458Patch, Third Party Advisory
- https://advisory.checkmarx.net/advisory/CX-2021-4308Exploit, Third Party Advisory
- https://github.com/apostrophecms/sanitize-html/blob/main/CHANGELOG.md#231-2021-01-22Release Notes, Third Party Advisory
- https://github.com/apostrophecms/sanitize-html/pull/458Patch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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