Cyber Resilience

CVE-2023-49967

Typecho 1.2.1

Public PoC
Published
07 December 2023
Modified
21 November 2024
CVSS Score v3.1 7.5
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score 0.0076 52th percentile
Risk Priority 59 floored blend · peak EPSS

Summary

CVE-2023-49967 is a high-severity XML Entity Expansion (CWE-776) vulnerability in Typecho Typecho. Its CVSS base score is 7.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Endpoint Denial of Service (T1499); ranked in the top 48% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

OWASP Top 10 for Web (2025)

A02:2025 Security Misconfiguration

EU & UK References

Vulnerability Data

Typecho v1.2.1 was discovered to be vulnerable to an XML Quadratic Blowup attack via the component /index.php/action/xmlrpc.

CWE(s)
CWE-776

Related Threats

MITRE ATT&CK Enterprise Techniques

T1499 Endpoint Denial of Service Impact
Adversaries may perform Endpoint Denial of Service (DoS) attacks to degrade or block the availability of services to users.
attack.mitre.org →
T1499.003 Application Exhaustion Flood Impact
Adversaries may target resource intensive features of applications to cause a denial of service (DoS), denying availability to those applications.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2023-6613Same product: Typecho Typecho
CVE-2023-27711Same product: Typecho Typecho
CVE-2023-30184Same product: Typecho Typecho
CVE-2024-57369Same product: Typecho Typecho
CVE-2023-36299Same product: Typecho Typecho
CVE-2023-6614Same product: Typecho Typecho
CVE-2023-6615Same product: Typecho Typecho
CVE-2024-46494Same product: Typecho Typecho
CVE-2024-35538Same product: Typecho Typecho
CVE-2024-35540Same product: Typecho Typecho

Affected Assets

typecho
typecho
1.2.1

Mitigating Controls

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 full match
prevents

Secure SDLC practices directly prevent introduction of improper recursive entity handling in XML code.

PR.PS-01 mostly match
prevents

Hardened configuration baselines can disable or limit DTD entity expansion in XML parsers.

ID.RA-01 partial match
prevents

Identifying and recording vulnerabilities can discover XML entity expansion flaws before exploitation.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing can detect and block XML entity-expansion vulnerabilities before deployment.

A.8.25 Secure development life cycle partial match
prevents

Secure SDLC mandates input validation and parser hardening that can prevent unbounded entity expansion.

A.8.26 Application security requirements partial match
prevents

Application security requirements can explicitly call for limits on XML entity recursion and DTD processing.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure architecture principles discourage unsafe parser configurations that enable entity expansion attacks.

A.8.28 Secure coding partial match
prevents

Secure coding standards directly require disabling or restricting recursive entity references in XML parsers.

References