Security 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 0.0075 54th percentile
Risk Priority 59 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

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 NTDS (T1003.003); ranked in the top 46% 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

T1003.003 NTDS Credential Access
Adversaries may attempt to access or create a copy of the Active Directory domain database in order to steal credential information, as well as obtain other information about domain members such as devices, users, and access rights.
attack.mitre.org →
T1003.004 LSA Secrets Credential Access
Adversaries with SYSTEM access to a host may attempt to access Local Security Authority (LSA) secrets, which can contain a variety of different credential materials, such as credentials for service accounts.
attack.mitre.org →
T1003.005 Cached Domain Credentials Credential Access
Adversaries may attempt to access cached domain credentials used to allow authentication to occur in the event a domain controller is unavailable.
attack.mitre.org →
T1003.006 DCSync Credential Access
Adversaries may attempt to access credentials and other sensitive information by abusing a Windows Domain Controller's application programming interface (API)(Citation: Microsoft DRSR Dec 2017) (Citation: Microsoft GetNCCChanges) (Citati…
attack.mitre.org →
T1005 Data from Local System Collection
Adversaries may search local system sources, such as file systems, configuration files, local databases, virtual machine files, or process memory, to find files of interest and sensitive data prior to Exfiltration.
attack.mitre.org →
T1006 Direct Volume Access Stealth
Adversaries may directly access a volume to bypass file access controls and file system monitoring.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2024-35538Same product: Typecho Typecho
CVE-2023-6613Same product: Typecho Typecho
CVE-2024-35540Same product: Typecho Typecho
CVE-2023-27131Same product: Typecho Typecho
CVE-2023-30184Same product: Typecho Typecho
CVE-2023-27711Same product: Typecho Typecho
CVE-2024-46494Same product: Typecho Typecho
CVE-2023-27130Same product: Typecho Typecho
CVE-2023-24114Same product: Typecho Typecho
CVE-2024-35539Same 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.

ID.RA-01 partial match
blocks

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

PR.PS-01 partial match
blocks

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

PR.PS-06 partial match
blocks

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

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.8.25 Secure development life cycle partial match
blocks

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

A.8.26 Application security requirements partial match
blocks

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
blocks

A.8.27 mandates security-by-design principles (defense-in-depth, least privilege, distrust external input, fail securely, hardening, design review against attack patterns) that reach some but not most instances of unsafe DTD entity expansion; the dominant fix is explicit parser configuration or entity limits, which the clause names only as one possible output of its broader process.

A.8.28 Secure coding partial match
prevents

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

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

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

A.8.9 Configuration management partial match
removes

References