Cyber Resilience

CVE-2025-2776

XXE in Sysaid ≤ 23.3.40

CISA KEVActive ExploitationEUVD ExploitedPublic PoCXXE
Published
07 May 2025
Modified
17 June 2026
KEV Added
22 July 2025
CVSS Score v3.1 9.3
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:L
EPSS Score 0.64 99.2th percentile
Risk Priority 92 floored blend · peak EPSS

Summary

CVE-2025-2776 is a critical-severity Improper Restriction of XML External Entity Reference (CWE-611) vulnerability in Sysaid Sysaid. Its CVSS base score is 9.3 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 0.8% of CVEs by exploit likelihood; CISA has added it to the Known Exploited Vulnerabilities catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified map to CM-6 (Configuration Settings) and SA-11 (Developer Testing and Evaluation) — see the control section below for these in your framework.

Deeper analysis AI-assisted summary

Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.

SysAid On-Prem versions up to and including 23.3.40 contain an unauthenticated XML External Entity vulnerability (CWE-611) in the Server URL processing functionality. The flaw permits external entity expansion during XML handling, which can be triggered without credentials and carries a CVSS 3.1 score of 9.3 reflecting network attack vector, low complexity, and impacts that include high confidentiality loss with limited availability effects under changed scope.

An unauthenticated remote attacker can supply a malicious XML payload to the affected Server URL endpoint, resulting in arbitrary file disclosure on the server and the ability to take over an administrator account. These primitives enable further lateral movement or persistence within the on-premises deployment.

The vendor has published remediation guidance in release 24.40.60, and the vulnerability appears in CISA’s Known Exploited Vulnerabilities catalog, indicating that official patches and mitigation steps are available for affected installations.

The EPSS score has reached a current value of 0.6260 with a recorded peak of 0.6657, consistent with active exploitation interest following disclosure.

OWASP Top 10 for Web (2025)

A02:2025 Security Misconfiguration

EU & UK References

Vulnerability Data

SysAid On-Prem versions <= 23.3.40 are vulnerable to an unauthenticated XML External Entity (XXE) vulnerability in the Server URL processing functionality, allowing for administrator account takeover and file read primitives.

CWE(s)
CWE-611
KEV Date Added
22 July 2025

Related Threats

MITRE ATT&CK Enterprise Techniques

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
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 →
T1213 Data from Information Repositories Collection
Adversaries may leverage information repositories to mine valuable information.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2025-2775Same product: Sysaid Sysaidboth on KEV
CVE-2025-2777Same product: Sysaid Sysaid
CVE-2023-47246Same product: Sysaid Sysaidboth on KEV
CVE-2023-33706Same product: Sysaid Sysaid
CVE-2024-36393Same product: Sysaid Sysaid
CVE-2024-36394Same product: Sysaid Sysaid
CVE-2023-47247Same product: Sysaid Sysaid
CVE-2025-58360Shared CWE-611both on KEV
CVE-2023-45727Shared CWE-611both on KEV
CVE-2019-9670Shared CWE-611both on KEV

Affected Assets

sysaid
sysaid
≤ 23.3.40

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V1.5.1
  • V15.3.2

Mitigating Controls (NIST 800-53 r5) AI

CM-6 Configuration Settings good match

Secure configuration settings can disable external entity processing in XML parsers.

SA-11 Developer Testing and Evaluation good match

Developer testing can discover XXE flaws through targeted XML parsing tests.

SI-10 Information Input Validation good match

Input validation can reject or sanitize XML containing external entity references.

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-01 mostly match
prevents

Hardened XML parser configurations directly disable external entity resolution.

PR.PS-06 mostly match
prevents

Secure SDLC practices include input validation and safe XML parser configuration that prevent XXE.

ID.RA-01 partial match
prevents

Vulnerability scanning can discover XXE flaws but does not prevent their introduction in code.

PR.PS-02 partial match
prevents

Patching eliminates XXE-vulnerable parser versions but is only one aspect of software maintenance.

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 in development catches XXE via static analysis and dynamic XML fuzzing.

A.8.8 Management of technical vulnerabilities mostly match
finds

Vulnerability management identifies and patches XML libraries with unsafe default entity settings.

A.8.25 Secure development life cycle partial match
prevents

Secure development life cycle mandates input validation and entity handling that directly prevents XXE.

A.8.26 Application security requirements partial match
prevents

Application security requirements explicitly call for disabling external entity processing in XML parsers.

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

Secure architecture principles include safe parser configuration that mitigates external entity risks.

A.8.28 Secure coding partial match
prevents

Secure coding standards require disabling DTDs and external entities in XML processing.

References