What’s Vulnerable › Vulnerabilities

CVE-2023-42457: plone.rest vulnerable to Denial of Service when ++api++ is used many times

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-09-21 · updated 2026-06-17
• Weakness: CWE-400

Description

plone.rest allows users to use HTTP verbs such as GET, POST, PUT, DELETE, etc. in Plone. Starting in the 2.x branch and prior to versions 2.0.1 and 3.0.1, when the `++api++` traverser is accidentally used multiple times in a url, handling it takes increasingly longer, making the server less responsive. Patches are available in `plone.rest` 2.0.1 and 3.0.1. Series 1.x is not affected. As a workaround, one may redirect `/++api++/++api++` to `/++api++` in one's frontend web server (nginx, Apache).

Affected products

• plone.rest: 2.0.0, 3.0.0

References

• http://www.openwall.com/lists/oss-security/2023/09/22/2
• https://github.com/plone/plone.rest/commit/43b4a7e86206e237e1de5ca3817ed071575882f7
• https://github.com/plone/plone.rest/commit/77846a9842889b24f35e8bedc2e9d461388d3302
• https://github.com/plone/plone.rest/security/advisories/GHSA-h6rp-mprm-xgcq
• http://www.openwall.com/lists/oss-security/2023/09/22/2
• https://github.com/plone/plone.rest/commit/43b4a7e86206e237e1de5ca3817ed071575882f7
• https://github.com/plone/plone.rest/commit/77846a9842889b24f35e8bedc2e9d461388d3302
• https://github.com/plone/plone.rest/security/advisories/GHSA-h6rp-mprm-xgcq

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