CVE-2026-48856: httpc leaks Authorization header to cross-origin redirect targets
CSIRTS triage
- What
- The Authorization header is leaked to cross-origin redirect targets.
- Who is affected
- Deployments using httpc are affected.
- Urgency
- Remediation is necessary due to medium severity, with no current exploitation reported.
- Action
- Apply the patch for CVE-2026-48856.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-48856
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-2026-488560.34% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 26% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-48856 | coverage & exploitation status | NVD · CVE.org |
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