Home/CVE/Apostrophe Technologies sanitize-html before 2.3.2 does not properly validate the hostnames set by the "allowedIframeHos
CVE

CVE-2021-26540

Apostrophe Technologies sanitize-html before 2.3.2 does not properly validate the hostnames set by the "allowedIframeHos

Apostrophe Technologies sanitize-html before 2.3.2 does not properly validate the hostnames set by the "allowedIframeHostnames" option when the "allowIframeRelativeUrls" is set to true, which allows attackers to bypass hostname whitelist for iframe element, related using an src value that starts with "/\\example.com".

MEDIUM · CVSS 5.3 EPSS 0.00288
Schedule remediation
  • Public exploit or PoC is available
Sigma rules0 YARA rules0
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Affected Products & Versions

1
apostrophecms sanitize-html< 2.3.2
▤

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
npm sanitize-html MODERATE fixed in 2.3.2
⚠

Public Exploits & PoCs

1
pocadvisory.checkmarx.net · CX-2021-4309advisory.checkmarx.net
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Scoring & Timeline

5.3
MEDIUM · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD08 Feb 2021 · 05:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
⚑

Vendor Advisories

2
rhsaRHSA-2021:3759Moderate
rhsaRHSA-2021:2438Moderate
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/apostrophecms/sanitize-html/blob/main/CHANGELOG.md#232-2021-01-26Release NotesThird Party Advisory
https://github.com/apostrophecms/sanitize-html/pull/460PatchThird Party Advisory
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