[UPDATE] [high] Apache HTTP Server: Multiple vulnerabilities

CSIRTS triage

What

Multiple vulnerabilities allow attackers to execute arbitrary code, bypass security measures, conduct cross-site scripting attacks, alter and disclose data, cause denial-of-service conditions, or carry out other unspecified attacks.

Who is affected

Users of Apache HTTP Server are affected.

Urgency

Remediation is high urgency due to the critical nature of the vulnerabilities.

Action

Update Apache HTTP Server to the latest version.

AI-assisted analysis generated from the source advisory — verify against the original.

Details

Source

CERT-Bund (BSI) Security Advisories (DE · national-cert · site)

Severity

high

Published

2026-08-25

Exploitation

Not in CISA KEV at last sync

Language

Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-1824

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.

• Elevated exploitation riskCVE-2026-4997528.0% 30-day exploitation probability — well above the norm. Schedule remediation this cycle. Riskier than 98% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-291670.69% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 50% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-291700.52% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 42% of all EPSS-scored CVEs.
• Moderate exploitation riskCVE-2026-343551.1% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 63% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-343560.71% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 50% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-425350.54% 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-2026-425360.99% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 59% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-439510.55% 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-2026-441190.18% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 8% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-441850.71% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 51% of all EPSS-scored CVEs.

Referenced CVEs

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

• unknownNCSC-2026-0309 [1.00] [M/H] Vulnerabilities resolved in Oracle Communicationsncsc-nl
• unknownNCSC-2026-0307 [1.00] [M/H] Vulnerabilities resolved in Oracle Database Productsncsc-nl
• high[NEW] [HIGH] Oracle Communications: Multiple Vulnerabilitiescert-bund
• high[UPDATE] [high] HTTP/2 implementations: Vulnerability allows denial of servicecert-bund
• unknownMultiple vulnerabilities in Fortinet products (August 13, 2026)cert-fr-avis
• unknownHTTP/2 Bomb CVE-2026-49975fortinet
• high[NEW] [high] Oracle Solaris third-party components: Multiple vulnerabilitiescert-bund
• high[NEW] [high] Oracle Communications: Multiple vulnerabilitiescert-bund
• unknownUSN-8589-1: Apache HTTP Server vulnerabilitiesubuntu
• unknownNCSC-2026-0256 [1.00] [M/H] Vulnerabilities fixed in Oracle Communicationsncsc-nl
• unknownUSN-8571-1: Apache HTTP Server vulnerabilitiesubuntu
• unknownUSN-8516-1: Apache HTTP Server vulnerabilitiesubuntu

Recent advisories for Apache HTTP Server

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.

• highCVE-2026-54789: mod_auth_openidc is an OpenID Certified authentication and authorization module for the Apache…nvd · 2026-08-21
• high[UPDATE] [high] Apache HTTP Server: Multiple vulnerabilitiescert-bund · 2026-08-21
• mediumCVE-2026-63044: Server-Side Request Forgery (SSRF) vulnerability in Apache InLong. Any authenticated user (no …nvd · 2026-08-20
• high[UPDATE] [high] Apache HTTP Server: Multiple vulnerabilitiescert-bund · 2026-08-20
• medium[UPDATE] [medium] Apache HTTP Server: Multiple Vulnerabilities Allow Data Manipulationcert-bund · 2026-08-20
• highexploited[UPDATE] [high] Apache HTTP Server: Multiple vulnerabilitiescert-bund · 2026-08-20

More from CERT-Bund (BSI) Security Advisories

• high[NEW] [high] Linux Kernel: Multiple vulnerabilities2026-08-25
• medium[NEW] [medium] libTIFF: Multiple Vulnerabilities2026-08-25
• high[NEW] [high] Contao: Multiple Vulnerabilities2026-08-25
• medium[NEW] [medium] Django: Multiple Vulnerabilities2026-08-25
• high[NEW] [high] Red Hat Enterprise Linux (Apicurio Registry): Multiple Vulnerabilities2026-08-25