CVE-2026-76427 — XML External Entity (XXE) in Cisco Identity Services Engine
A vulnerability in the offline profiler feed service of Cisco ISE could allow an authenticated, remote attacker to read arbitrary files that are stored on an affected device. This vulnerability is due to the parsing of attacker-controlled feed metadata with an XML parser that does not disable external entity resolution. An attacker could exploit this vulnerability by uploading a crafted offline feed package through the administrative interface. A successful exploit could allow the attacker to read arbitrary files from the file system and issue requests to internal systems from the affected device. To exploit this vulnerability, the attacker must have valid administrative credentials.
Who exploits it and how urgent it is
A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.
How the score was calculated
- Technical severity (medium)+3
The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).
Triage
Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.
Remediation
Fixes and mitigations documented by the sources — linked to the original advisory.
No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.
First 24 hours
Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.
- Identify exposed assets running the affected vendor/product/version combinations (Cisco Identity Services Engine).
- No fix documented in the sources: reduce exposure and monitor the vendor advisory.
- Search available logs for exploit probes matching the vulnerability class (injection), errors and authentication anomalies.
Affected scope
Vendor, product and versions as the sources word them.
| Vendor | Product | Versions | Status | Source |
|---|---|---|---|---|
| Cisco | Identity Services Engine |
version 3.3.0-patch9version 3.5.0-patch3version 3.5.0-patch2version 3.5.0-patch1version 3.5.0version 3.4.0-patch6version 3.4.0-patch5version 3.4.0-patch4 and 15 moreversion 3.4.0-patch3version 3.4.0-patch2version 3.4.0-patch1version 3.4.0≥ 3.1.0 and < 3.3.0version 3.3.0-patch8version 3.3.0-patch7version 3.3.0-patch6version 3.3.0-patch5version 3.3.0-patch4version 3.3.0-patch3version 3.3.0-patch2version 3.3.0-patch11version 3.3.0-patch10version 3.3.0-patch1 |
Vulnerable | NIST National Vulnerability Database |
Attack characteristics
The CVSS vector, decoded. It describes the attack, not your exposure to it.
Every base score collected
Sources score independently and may disagree; each row says who scored it and under which version.
| Score | Version | Severity | Expl. | Impact | Scored by |
|---|---|---|---|---|---|
| 4.9 | CVSS 3.1 | Medium | 1.2 | 3.6 | psirt@cisco.com via NIST National Vulnerability Database |
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N (score shown at the top: psirt@cisco.com) Weakness MITRE
Weakness class according to MITRE’s CWE catalog.
Detection
Read off the CVSS vector and the weakness class. Starting points, not tested rules.
- Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
- Look for parameters with command/query metacharacters and unexpected child processes of the service.
Timeline
What happened to this CVE, newest first.
- 2026
- Record published
- CVSS changed · 4.9
- Source status changed · → Analyzed
- Record created in this database
- CVE published
Source activity
Repeated readings are counted rather than listed.
- 1× Official description updated · Oct 15, 2026 – Oct 15, 2026
References
1 on the record
Elsewhere on this site
Related CVEs (same products)
- Medium CVE-2026-76451 A vulnerability in Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity… 29d
- Critical CVE-2026-76460 Cisco Identity Services Engine Incorrect Use of Privileged APIs Vulnerability KEV 29d
- Medium CVE-2026-76449 SQL Injection in Cisco Identity Services Engine 29d
- Medium CVE-2026-76450 A vulnerability in Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity… 29d
- Medium CVE-2026-76448 SQL Injection in Cisco Identity Services Engine 29d
- Medium CVE-2026-76446 XML External Entity (XXE) in Cisco Identity Services Engine 29d
Not in any source we poll
Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.
- No FIRST EPSS score.
- No fixed version, patch or mitigation documented.
- No CISA SSVC assessment.
- No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
- No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
- No exploit packet captures, log samples, or incident case IDs supplied.
Answered from this record
Text assembled only from the fields above — no additional claims.
What should defenders know first?
CVE-2026-76427 is "XML External Entity (XXE) in Cisco Identity Services Engine", rated Medium. It affects Identity Services Engine (Cisco); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 4.9 describes technical severity. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.
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