CVE-2026-91859
MEDIUMDescription
Affected versions of MISP can record incorrect access-log data for requests that terminate in an exception. Because CakeErrorController extends AppController, exception rendering runs the application startup path a second time. As a result, __accessMonitor() calls AccessLog::logRequest() twice for one HTTP request. The second deferred writer measures the error-controller execution instead of the original request and can overwrite the row created by the first pass. The corrupted fields include request duration, SQL query count, memory usage, and potentially the recorded query log. The bug was masked because the same model instance retained the ID of the first saved row, causing the later save to issue an UPDATE rather than insert an obvious duplicate row. Version affected: ≤2.5.45
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v4 Vector
Exploitability
Impact
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Exploit Intelligence
Low risk: more likely to be exploited than 40% of all known CVEs.
References
Related Vulnerabilities
Other CWE-223 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2023-28360 | Medium | 4.3 | 0.8% | - | Fix |
| CVE-2024-52813 | Medium | 4.3 | 0.5% | - | - |
| CVE-2022-44646 | Low | 2.2 | 0.4% | - | Fix |
| CVE-2023-31191 | Critical | 9.3 | 0.4% | - | - |
| CVE-2023-29156 | Medium | 4.7 | 0.3% | - | - |
| CVE-2022-22563 | Medium | 4.4 | 0.2% | - | - |
Common questions
How do I fix CVE-2026-91859?
No published fix for CVE-2026-91859 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2026-91859 being actively exploited?
Not that we know of. CVE-2026-91859 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.47% is the estimated probability that it will be exploited in the next 30 days. That is higher than 40% of all scored CVEs.
How severe is CVE-2026-91859?
CVE-2026-91859 has a CVSS v4 base score of 5.3, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-09-16.