CVE-2021-31779Network attack vector

Authenticated internal-resource access via unrestricted analyzed URLs

Published Apr 28, 2021 · Updated Aug 3, 2024

SSRF in Yoast SEO for TYPO3 7.2.0 and earlier allows remote authenticated users to make server-originated HTTP requests. URL analysis fails to restrict analyzed URLs to domains managed by the current TYPO3 website and requests arbitrary external or internal domains. A logged-in TYPO3 backend account is required; the server can consequently reach resources that are otherwise inaccessible to that account.

CVSS severity6.4
Medium
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Yoast SEO for TYPO3 7.2.0 and earlier allows remote authenticated users to make server-originated HTTP requests. URL analysis fails to restrict analyzed URLs to domains managed by the current TYPO3 website and requests arbitrary external or internal domains. A logged-in TYPO3 backend account is required; the server can consequently reach resources that are otherwise inaccessible to that account.

The record

CVE
CVE-2021-31779
Published
Apr 28, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-918, T1090
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 28, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
5.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1090Proxy

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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