[UPDATE] [medium] Apache log4j: Multiple vulnerabilities allow file manipulation
An attacker can exploit multiple vulnerabilities in Apache log4j to manipulate files.
CSIRTS triage
- What
- An attacker can exploit multiple vulnerabilities in Apache log4j to manipulate files.
- Who is affected
- Deployments using Apache log4j.
- Urgency
- Remediation is medium urgency as the vulnerabilities could lead to file manipulation.
- Action
- Apply patches as they become available.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-1067
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-344770.41% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 34% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-344780.83% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 54% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-344790.53% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 43% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-344800.86% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 55% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-344810.69% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 50% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-34477 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-34478 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-34479 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-34480 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-34481 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- unknownNCSC-2026-0312 [1.00] [M/H] Vulnerabilities resolved in Oracle Financial Servicesncsc-nl
- unknownNCSC-2026-0311 [1.00] [M/H] Vulnerabilities resolved in Oracle Enterprise Managerncsc-nl
- high[NEW] [high] Oracle Enterprise Manager: Multiple vulnerabilitiescert-bund
- high[NEW] [high] Oracle Financial Services Applications: Multiple vulnerabilitiescert-bund
- high[NEW] [high] Oracle Hyperion: Multiple vulnerabilitiescert-bund
- high[NEW] [high] Oracle Supply Chain: Multiple vulnerabilitiescert-bund
- medium[NEW] [medium] Oracle Retail Applications: Vulnerability compromises integritycert-bund
- unknownMultiple vulnerabilities in Oracle MySQL (August 19, 2026)cert-fr-avis
- unknownexploitedMultiple vulnerabilities in IBM products (August 14, 2026)cert-fr-avis
- unknownMultiple vulnerabilities in SAP products (August 11, 2026)cert-fr-avis
- high[NEW] [high] Oracle Communications: Multiple vulnerabilitiescert-bund
- high[NEW] [high] Oracle Fusion Middleware: Multiple vulnerabilitiescert-bund
Recent advisories for Apache log4j
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- medium[NEW] [medium] Apache log4j and Log4cxx: Multiple vulnerabilities allow file manipulationcert-bund · 2026-08-13
- low[UPDATE] [low] Apache log4j: Vulnerability allows information disclosurecert-bund · 2026-08-04
- mediumGHSA-qv9r-c865-cp47: Apache Log4j API: Improper encoding of non-finite floating-point values during MapMessage…ghsa · 2026-07-11
- mediumCVE-2026-49844: Improper encoding of non-finite floating-point values during MapMessage JSON serialization in …nvd · 2026-07-10
- critical[UPDATE] [critical] Apache log4j: Vulnerability allows code executioncert-bund · 2026-07-08
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