CVE-2026-55957
Public exploit code is available. Proof-of-concept or working exploit code for CVE-2026-55957 is indexed in GitHub PoC. Expect opportunistic scanning and exploitation attempts — prioritize remediation even though it is not (yet) in the CISA KEV catalog.
An attacker can exploit multiple vulnerabilities in Apache Tomcat to bypass security measures, cause a Denial-of-Service condition, conduct Cross-Site Scripting attacks, or trigger other unspecified impacts.
CSIRTS triage
- What
- An attacker can exploit multiple vulnerabilities in Apache Tomcat to bypass security measures, cause a Denial-of-Service condition, conduct Cross-Site Scripting attacks, or trigger other unspecified impacts.
- Who is affected
- Deployments of Apache Tomcat are affected.
- Urgency
- Remediation is medium urgency due to the potential for various impacts including Denial of Service.
- Action
- Apply the latest security updates for Apache Tomcat.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Moderate exploitation risk2.9% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 86% of all EPSS-scored CVEs.
Exploit availability
Public exploit or proof-of-concept code for CVE-2026-55957 is indexed in these free datasets. Available exploit code raises real-world risk independent of the CVSS score.
- GitHub PoCPublic proof-of-concept repositories on GitHub reference this CVE.look it up ↗
Advisory coverage (3)
- medium[UPDATE] [medium] Apache Tomcat: Multiple vulnerabilitiescert-bund · 2026-08-18
- unknownApache Tomcat Multiple Vulnerabilitieshkcert · 2026-07-02
- highCVE-2026-55957: Missing Critical Step in Authentication vulnerability in Apache Tomcat when the JNDIRealm was …nvd · 2026-06-29
External references
Embed the live status
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[](https://www.csirts.com/cve/CVE-2026-55957)